C 语言客户账单系统

2024 年 8 月 28 日 | 阅读 19 分钟

账单软件用于为客户提供服务和商品开具发票，并跟踪时间和账单。它有助于管理连锁店以及其他公司账单系统。此外，它还提供循环服务和专业的租金账单系统。账单系统有助于自动化耗时的操作，包括但不限于发票的创建、产品的跟踪和其他会计记录。此外，您不必每次开票都担心，因为此类软件会自动计算并对应税项目征税。

系统终端用户以及负责监督、管理和执行日常活动以促进所提议账单系统使用的管理员被称为管理员。
客户 - 所提议的基于网络的账单和收款系统的目标用户。
效率是一组特性，它影响软件在特定情况下执行的方式以及使用的资源数量。这些特性包括时间行为和资源利用率。
功能性 - 一组元素，包括适用性、准确性、互操作性和安全性，影响一组功能及其声称属性的存在。
软件从一个环境迁移到另一个环境的能力取决于许多因素，包括适应性、可安装性、共存性以及可替换性。
可靠性是软件在给定环境中运行并长时间保持其性能水平的能力。影响此能力的三种品质是成熟度、容错性和可恢复性。

程序分解

struct item
{
	int productno ;
	char productname [ 10 ] ;
	int quantity ;
	int price ;
}
item ;

以上是项目的结构。

struct customer
{
	int productno ;
	char productname [ 10 ] ;
	int quantity ;
	int price ;
	int amount ;
}

以上是客户的结构。

struct temporary
{
	int productno;
	char productname[10];
	int quantity;
	int price;
	int amount;
}

以上是临时信息的结构。

void create ( )
{
	int i = 0 ;
	FILE * fp ;
	fp = fopen ( " Records.txt " , " w " ) ;
	if ( fp = = NULL )
	{
		printf ( " Error \ n " ) ;
	}
	printf ( " \ t " ) ;
	printf ( " Enter the Number of Records : " ) ;
	scanf ( " % d " , & n ) ;
	printf ( " \ n " ) ;
	FILE * fpq ;
	fpq = fopen ( " Quantity.txt " , " w " ) ;
	fprintf ( fp , " productno \ t , ProductName \ t , Quantity \ n , Price \ t " ) ;
	fprintf ( fpq , " % d " , n ) ;
	fclose ( fpq ) ;
while ( i < n )
	{
	    printf ( " \ t " ) ;
		printf ( " Enter Product Code : " ) ;
		scanf ( " % d " , & item.productno ) ;
		printf ( " \ t " ) ;
		printf ( " Enter Product Name : " ) ;
		scanf ( " % s " , item.productname ) ;
		printf ( " \ t " ) ;
		printf ( " Enter Quantity : " ) ;
		scanf ( " % d " , & item.quantity ) ;
		printf ( " \ t " ) ;
		printf ( " Enter Price : " ) ;
		scanf ( " % d " , & item.price ) ;
		printf ( " \ n " ) ;
		i + + ; 
		fprintf ( fp , " % d \ t % s \ t % d \ t % d \ t " , item.productno , item.productname , item.quantity , item.price ) ;
fclose ( fp ) ;
	printf ( " \ t " ) ;
	printf ( " Records are Created " ) ;
	printf ( " \ n " ) ;
	printf ( " \ n " ) ;
}

以上功能将向用户显示产品编号、产品名称、数量和价格等选项。

void bill ( )
{
	int na = 0 ;  //used for product number in scanf function
	int a = 0 ;	/**/
	int cont = 0 ;
	int k = 0 ;
	int r = 0 ;
	int w = 0 ;
	int ch = 0 ;
	int l = 0 ;	/**/
	int bi = 0 ;
	int ln = 0 ;
    printf ( " \ t " ) ;
	l3 : printf ( " Enter the Product Number : " ) ;
	scanf ( " % d " , & na ) ;
	printf ( " \ n " ) ;
	FILE * fp ;
	fp = fopen ( " Records.txt " , " w " ) ;
	FILE * fptr ;
	fptr = fopen ( " temp.txt " , " w " ) ;
	while ( ! ( feof ( fp ) ) )
	{
		l + + ;
		fscanf ( fp , " % d " , & item.productno ) ;
		fscanf ( fp , " % s " , item.productname ) ;
		fscanf ( fp , " % d " , & item.quantity ) ;
		fscanf ( fp , " % d " , & item.price ) ;
		if ( item.productno = = na )
		{
			ln + + ;
			if ( ln = = 2 )
			break ;
			printf ( " Enter the Quantity : " ) ;
			scanf ( " % d " , & a ) ;
			if ( a <= item.quantity )
			{
				cst [ ti ].productno = item.productno ;
				strcpy ( cst [ ti ].productname , item.productname ) ;
				cst [ ti ].quantity = a ;
				cst [ ti ].price = item.price ;
				item.quantity = item.quantity - a ;
				ti + + ;
				//goto l1 ;
			}
			else
			{
				printf ( " Sorry Out of Stock \ n " ) ;
				bi + + ;
				//goto l1 ;
			}
		}
		else
		{
			cont + + ;
			fprintf ( fptr , " % d \ t " , item.productno ) ;
			fprintf ( fptr , " % s \ t " , item.productname ) ;
			fprintf ( fptr , " % d \ t " , item.quantity ) ;
			fprintf ( fptr , " % d \ t " , item.price ) ;
			continue ;
		}
		fprintf ( fptr , " % d \ t " , item.productno ) ;
		fprintf ( fptr , " % s \ t " , item.productname ) ;
		fprintf ( fptr , " % d \ t " , item.quantity ) ;
		fprintf ( fptr , " % d \ t " , item.price ) ;
	}
	if ( l = = cont )
	printf ( " Error : Choose Properly \ n " ) ;
	fclose ( fptr ) ;
	fclose ( fp ) ;
	remove ( " Records.txt " ) ;
	rename ( " temp.txt " , " Records.txt " ) ;
	ln = 0 ;
	printf ( " Do you Want to Shop More : \ n Press 1 for More \ n Press 2 to Exit " ) ;
	scanf ( " % d " , & k ) ;
	if ( k = = 1 )
	goto l3 ;
}

以上代码将生成用户输入产品的账单。

void display ( )
{
	int nk = 0 ;
	FILE * fp ;
	fp = fopen ( " Records.txt " , " r " ) ;
	if ( feof ( fp ) )
	{
		printf ( " Error in Opening Files \ n " ) ;
	}
	printf ( " \ t " ) ;
	printf ( " = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = \ n " ) ;
	printf ( " \ t " ) ;
	printf ( " | Product Number \ t | Product Name \ t | Quantity \ t | Price \ t \ n " ) ;
	printf ( " \ t " ) ;
	printf ( " = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = \ n " ) ;
	while ( nk ! = n )
	{
		nk + + ;
		fscanf ( fp , " % d " , & item.productno ) ;
		if ( item.productno = = 0 )
		{
		    printf ( " \ t " ) ;
			printf ( " There are no items in Cart " ) ;
			printf ( " \ n " ) ;
			break ;
		}
		fscanf ( fp , " % s " , item.productname ) ;
		fscanf ( fp , " % d " , & item.quantity ) ;
		fscanf ( fp , " % d " , & item.price ) ;
		printf ( " \ n \ t % 14d | \ t % 8s | \ t % 8d | \ t % d | \ n " , item.productno , item.productname , item.quantity , item.price ) ;
        //  printf ( " \ n " ) ;
	}
	fclose ( fp ) ;
}

要显示 record txt 文件中的内容，以上代码将起作用。

void edit ( )
{
	FILE * fp ;
	FILE * fptr ;
	FILE * fpk ;
	int h ;
	int found = 0 ;
	int ka = 0 ;
	int p ;
	fp = fopen ( " Records.txt " , " r " ) ;
	fptr = fopen ( " temp1.txt " , " w " ) ;
	fpk = fopen ( " temp2.txt " , " w " ) ;
	printf ( " \ t " ) ;
	printf ( " Enter the Product Number to Delete : " ) ;
	scanf ( " % d " ,& h ) ;
	printf ( " \ n " ) ;
	p = n ;
	while ( ! ( ka == p ) ) 
	{
		ka + + ;
		fscanf ( fp , " % d " , & item.productno ) ;
		if ( item.productno == h )
		{
			found = 1 ;
			fscanf ( fp , " % s " , item.productname ) ;
			fscanf ( fp , " % d " , & item.quantity ) ;
			fscanf ( fp , " % d " , & item.price ) ;
			n - - ;
			printf ( " \ t " ) ;
			printf ( " Product has been Successfully Deleted \ n " ) ;
		}
		else
		{
			fscanf ( fp , " % s " , item.productname ) ;
			fscanf ( fp , " % d " , & item.quantity ) ;
			fscanf ( fp , " % d " , & item.price ) ;
			fprintf ( fptr , " % d \ t % s \ t % d \ t % d \ t " , item.productno , item.productname , item.quantity , item.price ) ;
		}
	}
	fprintf ( fpk , " % d " , n ) ;
	fclose ( fpk ) ;
	fclose ( fptr ) ;
	fclose ( fp ) ;
	if ( found == 0 )
	{
	    printf ( " \ t " ) ;
		printf ( " Product no Found " ) ;
		printf ( " \ n " ) ;
		printf ( " \ n " ) ;
	}
	remove ( " Quantity.txt " ) ;
	rename ( " temp2.txt " , " Quantity.txt " ) ;
	remove ( " Records.txt " ) ;
	rename ( " temp1.txt " , " Records.txt " ) ;
}

要编辑产品详细信息，以上代码将起作用。

void invoice ( )
{
	int j ;
	int o ;
	float gt = 0 ;
	if ( ti == 0 ) 
	{
		printf ( " There are No Products in your Cart " ) ;
		printf ( " \ n " ) ;
	}
	printf ( " \ n \ n " ) ;
	printf ( " * * * ** * * * * * * * * * * * * * * * * * * INVOICE * * * ** * * * * * * * * * * * * * * * * * *  " ) ; 
	printf ( " \ n \ n " ) ;
	printf ( " product number \ t | product name \ t | price \ t | quantity \ t | amount \ t | \ n " ) ;
	printf ( " * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * \ n " ) ;
	for ( o = 0 ; o < ti ; o + + )
	{
		cst [ o ].amount = 0 ;
		cst [ o ].amount = ( ( cst [ o ].price ) * ( cst [ o ].quantity ) ) ;
		gt = gt + cst [ o ].amount ;
	}
	for ( j = 0 ; j < ti ; j + + )
	{
		printf ( "%  6 d \ t | % 9s \ t  | % 3 d \ t | % 3 d \ t | % 3 d \ n " , cst [ j ].productno , cst [ j ].productname ,cst [ j ].price , cst [ j ].quantity , cst [ j ].amount ) ;
	}
	printf ( " \ n Amount Payable : % f " , gt ) ;
	printf ( " \ n " ) ;
	printf ( " Thank you for Shopping " ) ;
	printf ( " \ n " ) ;
	printf ( " Visit Again " ) ;
	printf ( " \ n " ) ;
}

以上代码将给出

void mdelete ( )
{
	int i = 0 ;
	int j = 0 ;
	int f = 0 ;
	int g = 0 ;
	int ag = 0 ;
	int aj = 0 ;
	char ab [ 100 ] ;
	FILE * fw ;
	FILE * fq ;
	printf ( " \ t" ) ;
	printf ( " Enter the Product Number to be Deleted : " ) ;
	scanf ( " % d " , & f ) ;
	printf ( " \ n " ) ; 
	for ( i = 0 ; i < ti ; i + + )
	{
		if ( cst [ ti ].productno == f )
		{
			aj = cst [ i ].quantity ;
			printf ( " \ t " ) ;
			printf ( " Product Deleted Successfully " ) ;
			printf ( " \ n " ) ;
		}
		continue ;
		cstr [ g ].productno = cst [ i ].productno ;
	  	strcpy ( cstr [ g ].productname , cst [ i ].productname ) ;
	  	cstr [ g ].quantity = cst [ i ].quantity ;
	  	cstr [ g ].price = cst [ i ].price ;
	  	g + + ;
	}
	for ( j = 0 ; j < g ; j + + )
	{
		cst [ j ].productno = cstr [ j ].productno ;
 	 	strcpy ( cst [ j ].productname , cstr [ j ].productname ) ;
	  	cst [ j ].quantity = cstr [ j ].quantity ;
	  	cst [ j ].price = cstr [ j ].price ;
	}
	ti = g ;
	printf ( " \ n % d " , aj ) ;
	fq = fopen ( " shop.txt " , " r " ) ;
	fw = fopen ( " temp4.txt " , " w " ) ;
	for ( j = 0 ; j < n ; j + + ) 
	{
		fscanf ( fq , " % d " , & item.productno ) ;
		fscanf ( fq , " % s " , item.productname ) ;
		fscanf ( fq , " % d " , & item.quantity ) ;
		fscanf ( fq , " % d " , & item.price ) ;
		if ( item.productno == f )
		{
		    ag = aj + item.quantity ;
            fprintf ( fw , " % d \ t % s \ t % d \ t % d \ t " , item.productno , item.productname , ag , item.price ) ;
        }
        else
        {
        	fprintf ( fw , " % d \ t % s \ t % d \ t % d \ t " , item.productno , item.productname , item.quantity , item.price ) ;
        }
	}
	fclose ( fq ) ;
	fclose ( fw ) ;
	remove ( " Records.txt " ) ;
	rename ( " temp4.txt " , " Records.txt " ) ;
}

如果用户要删除项目，则以上代码将起作用。

void mdisplay ( )
{
	int i ;
	int j ;
	int o ;
	printf ( " = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = \n");
	printf ( " product number \ t | product name \ t | quantity \ t | price \ t \ n " ) ;
	printf ( " = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = \n");
	for ( o = 0 ; o < ti ; o + + )
	{
		printf ( " % 14 d \ t | % 12s \ t | % 6 d \ t | % 6 d \ n " , cst [ o ].productno , cst [ o ].productname , cst [ o ].quantity , cst [ o ].price ) ;
	}
}

以上代码将显示产品编号、产品名称、数量和价格。

客户账单系统程序

#include<stdio.h>
#include<string.h>
#include<ctype.h>
#include<conio.h>

struct item
{
	int productno;
	char productname[10];
	int quantity;
	int price;
}
item;
struct customer
{
	int productno;
	char productname[10];
	int quantity;
	int price;
	int amount;
}
cst[100];
struct temporary
{
	int productno;
	char productname[10];
	int quantity;
	int price;
	int amount;
}
cstr[100];
int t=0;
int n=0; //used in Quantity and Records.txt
int k=0;
int ba=0;
int ti=0;
void create()
{
	int i=0;
	FILE *fp;
	fp=fopen("Records.txt","w");
	if(fp==NULL)
	{
		printf("Error\n");
	}
	printf("\t");
	printf("Enter the Number of Records:");
	scanf("%d",&n);
	printf("\n");
	FILE *fpq;
	fpq=fopen("Quantity.txt","w");
	fprintf(fp,"productno\t,ProductName\t, Quantity\n, Price\t");
	fprintf(fpq,"%d",n);
	fclose(fpq);
	while(i<n)
	{
	    printf("\t");
		printf("Enter Product Code:");
		scanf("%d",&item.productno);
		printf("\t");
		printf("Enter Product Name:");
		scanf("%s",item.productname);
		printf("\t");
		printf("Enter Quantity:");
		scanf("%d",&item.quantity);
		printf("\t");
		printf("Enter Price:");
		scanf("%d",&item.price);
		printf("\n");
		i++;
		fprintf(fp,"%d\t%s\t%d\t%d\t",item.productno,item.productname,item.quantity,item.price);
	}
	fclose(fp);
	printf("\t");
	printf("Records are Created");
	printf("\n");
	printf("\n");
}
void bill()
{
	int na=0;  //used for product number in scanf function
	int a=0;	/**/
	int cont=0;
	int k=0;
	int r=0;
	int w=0;
	int ch=0;
	int l=0;	/**/
	int bi=0;
	int ln=0;
    printf("\t");
	l3 : printf("Enter the Product Number:");
	scanf("%d",&na);
	printf("\n");
	FILE *fp;
	fp=fopen("Records.txt","w");
	FILE *fptr;
	fptr=fopen("temp.txt","w");
	while(!(feof(fp)))
	{
		l++;
		fscanf(fp,"%d",&item.productno);
		fscanf(fp,"%s",item.productname);
		fscanf(fp,"%d",&item.quantity);
		fscanf(fp,"%d",&item.price);
		if(item.productno == na)
		{
			ln++;
			if(ln==2)
			break;
			printf("Enter the Quantity:");
			scanf("%d",&a);
			if(a <= item.quantity)
			{
				cst[ti].productno=item.productno;
				strcpy(cst[ti].productname,item.productname);
				cst[ti].quantity=a;
				cst[ti].price=item.price;
				item.quantity=item.quantity-a;
				ti++;
				//goto l1;
			}
			else
			{
				printf("Sorry Out of Stock\n");
				bi++;
				//goto l1;
			}
		}
		else
		{
			cont++;
			fprintf(fptr,"%d\t",item.productno);
			fprintf(fptr,"%s\t",item.productname);
			fprintf(fptr,"%d\t",item.quantity);
			fprintf(fptr,"%d\t",item.price);
			continue;
		}
		fprintf(fptr,"%d\t",item.productno);
		fprintf(fptr,"%s\t",item.productname);
		fprintf(fptr,"%d\t",item.quantity);
		fprintf(fptr,"%d\t",item.price);
	}
	if(l==cont)
	printf("Error:Choose Properly\n");
	fclose(fptr);
	fclose(fp);
	remove("Records.txt");
	rename("temp.txt","Records.txt");
	ln=0;
	printf("Do you Want to Shop More:\nPress 1 for More\nPress 2 to Exit");
	scanf("%d",&k);
	if(k==1)
	goto l3;
}

void display()
{
	int nk=0;
	FILE *fp;
	fp=fopen("Records.txt","r");
	if(feof(fp))
	{
		printf("Error in Opening Files\n");
	}
	printf("\t");
	printf(" = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = \n");
	printf("\t");
	printf("|Product Number\t|Product Name\t|Quantity\t|Price\t\n");
	printf("\t");
	printf(" = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = \n");
	while(nk!=n)
	{
		nk++;
		fscanf(fp,"%d",&item.productno);
		if(item.productno==0)
		{
		    printf("\t");
			printf("There are no items in Cart");
			printf("\n");
			break;
		}
		fscanf(fp,"%s",item.productname);
		fscanf(fp,"%d",&item.quantity);
		fscanf(fp,"%d",&item.price);
		printf("\n\t  %14d|\t%8s|\t%8d|\t%d|\n",item.productno,item.productname,item.quantity,item.price);
        //printf("\n");
	}
	fclose(fp);
}
void edit()
{
	FILE *fp;
	FILE *fptr;
	FILE *fpk;
	int h;
	int found=0;
	int ka=0;
	int p;
	fp=fopen("Records.txt","r");
	fptr=fopen("temp1.txt","w");
	fpk=fopen("temp2.txt","w");
	printf("\t");
	printf("Enter the Product Number to Delete: ");
	scanf("%d",&h);
	printf("\n");
	p=n;
	while(!(ka==p))
	{
		ka++;
		fscanf(fp,"%d",&item.productno);
		if(item.productno==h)
		{
			found=1;
			fscanf(fp,"%s",item.productname);
			fscanf(fp,"%d",&item.quantity);
			fscanf(fp,"%d",&item.price);
			n--;
			printf("\t");
			printf("Product has been Successfully Deleted\n");
		}
		else
		{
			fscanf(fp,"%s",item.productname);
			fscanf(fp,"%d",&item.quantity);
			fscanf(fp,"%d",&item.price);
			fprintf(fptr,"%d\t%s\t%d\t%d\t",item.productno,item.productname,item.quantity,item.price);
		}
	}
	fprintf(fpk,"%d",n);
	fclose(fpk);
	fclose(fptr);
	fclose(fp);
	if(found==0)
	{
	    printf("\t");
		printf("Product no Found");
		printf("\n");
		printf("\n");
	}
	remove("Quantity.txt");
	rename("temp2.txt","Quantity.txt");
	remove("Records.txt");
	rename("temp1.txt","Records.txt");
}
void invoice()
{
	int j;
	int o;
	float gt=0;
	if(ti==0)
	{
		printf("There are No Products in your Cart");
		printf("\n");
	}
	printf("\n\n");
	printf(" * * * ** * * * * * * * * * * * * * * * * * * INVOICE * * * ** * * * * * * * * * * * * * * * * * *  ");
	printf("\n\n");
	printf("product number\t| product name\t| price\t| quantity\t| amount\t|\n");
	printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * \n");
	for(o=0;o<ti;o++)
	{
		cst[o].amount=0;
		cst[o].amount=((cst[o].price)*(cst[o].quantity));
		gt=gt+cst[o].amount;
	}
	for(j=0;j<ti;j++)
	{
		printf("%6d\t       |%9s   \t  | %3d\t|%3d\t        |   %3d\n",cst[j].productno,cst[j].productname,cst[j].price,cst[j].quantity,cst[j].amount);
	}
	printf("\nAmount Payable:%f",gt);
	printf("\n");
	printf("Thank you for Shopping");
	printf("\n");
	printf("Visit Again");
	printf("\n");
}
void mdelete()
{
	int i=0;
	int j=0;
	int f=0;
	int g=0;
	int ag=0;
	int aj=0;
	char ab[100];
	FILE *fw;
	FILE *fq;
	printf("\t");
	printf("Enter the Product Number to be Deleted:");
	scanf("%d",&f);
	printf("\n");
	for(i=0;i<ti;i++)
	{
		if(cst[ti].productno==f)
		{
			aj=cst[i].quantity;
			printf("\t");
			printf("Product Deleted Successfully");
			printf("\n");
		}
		continue;
		cstr[g].productno=cst[i].productno;
	  	strcpy(cstr[g].productname,cst[i].productname);
	  	cstr[g].quantity=cst[i].quantity;
	  	cstr[g].price=cst[i].price;
	  	g++;
	}
	for(j=0;j<g;j++)
	{
		cst[j].productno=cstr[j].productno;
 	 	strcpy(cst[j].productname,cstr[j].productname);
	  	cst[j].quantity=cstr[j].quantity;
	  	cst[j].price=cstr[j].price;
	}
	ti=g;
	printf("\n%d",aj);
	fq=fopen("shop.txt","r");
	fw=fopen("temp4.txt","w");
	for(j=0;j<n;j++)
	{
		fscanf(fq,"%d",&item.productno);
		fscanf(fq,"%s",item.productname);
		fscanf(fq,"%d",&item.quantity);
		fscanf(fq,"%d",&item.price);
		if(item.productno==f)
		{
		    ag=aj+item.quantity;
            fprintf(fw,"%d\t%s\t%d\t%d\t",item.productno,item.productname,ag,item.price);
        }
        else
        {
        	fprintf(fw,"%d\t%s\t%d\t%d\t",item.productno,item.productname,item.quantity,item.price);
        }
	}
	fclose(fq);
	fclose(fw);
	remove("Records.txt");
	rename("temp4.txt","Records.txt");
}
void mdisplay()
{
	int i;
	int j;
	int o;
	printf(" = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = \n");
	printf("product number\t|product name\t|quantity\t|price\t\n");
	printf(" = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = \n");
	for(o=0;o<ti;o++)
	{
		printf("%14d\t|%12s\t|%6d\t|%6d\n",cst[o].productno,cst[o].productname,cst[o].quantity,cst[o].price);
	}
}

int main()
{
	char ch,password[10],q[10]="admin";
	int s=0;
	int y=0;
	int w=1;
	int i;
	FILE *fpe;
	fpe=fopen("Quantity.txt","r");
	fscanf(fpe,"%d",&n);
	fclose(fpe);
	printf("\n");
    q: printf("\n\t");
    printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * ");
    printf("\n");
    printf("\t");
    printf("Please Select an Option: ");
    printf("\n");
    printf("\t");
    printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * ");
    printf("\n");
    printf("\t");
	printf("01. ADMINISTRATOR");
	printf("\n\t");
	printf("02. CUSTOMER");
	printf("\n\t");
	printf("03. EXIT");
	printf("\n");
	printf("\n\t");
	printf("Please Enter an Option: ");
	scanf("%d",&s);

	switch(s)
	{
	          case 1: printf("\tEnter Password:\t");
              for(i=0;i<5;i++)
              {
              ch = getch();
              password[i] = ch;
              ch = '*' ;
               printf("%c",ch);
              }
              password[i]='\0';
              if(strcmp(password,q))
              {
                  printf("\n\t");
              printf("Wrong Password Please Try Again");
              printf("\n\n");
              goto q;
             }
               else
               goto l3;
               l3: printf("\n\t");
               printf("Access Granted\n");
               printf("\n\n");
               printf("\t");
               printf(" * * * * * * * * * * * *  * * * * * * * * * * * * * * * * ");
               printf("\n");
               printf("\t");
               printf("Please Select an Option: ");
               printf("\n");
               printf("\t");
               printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * ");
               printf("\n");
		       printf("\t01.CREATE");
		       printf("\n\t");
		       printf("02.DELETE/MODIFY");
		       printf("\n\t");
		       printf("03.DISPLAY");
		       printf("\n\t");
		       printf("04.MAIN MENU");
		       printf("\n");
		       printf("\n");
		       printf("\t");
		       printf("Please Enter an Option: ");
		        scanf("%d",&y);
		        switch(y)
		        {
        			case 1:create();
        			      goto q;
  			      case 2:edit();
  			             goto q;
                  case 3:display();
                         goto q;
                  case 4: goto q;
                  default : printf("error\n");
				  goto q;
        		}
		         break;

       case 2: printf("\n");
               printf("\t");
               printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * ");
               printf("\n");
               printf("\t");
               printf("Plese Select an Option: ");
               printf("\n");
               printf("\t");
               printf(" * * * * * * * * * * * * * * * * * * * * * * * * * * * * ");
               printf("\n");
               printf("\t");
               printf("01.BILL");
               printf("\n\t");
               printf("02.INVOICE");
               printf("\n\t");
               printf("03.DISPLAY");
               printf("\n\t");
               printf("04.MYCART");
               printf("\n\t");
               printf("05.MAIN MENU");
               printf("\n\t");
               printf("06.DELETE ITEMS IN CART\n");
               printf("\n\t");
               printf("Please Enter an Option: ");
               scanf("%d",&y);
               printf("\n");
               switch(y)
		        {
                    case 1 : bill();
        			         goto q;

                    case 2 : invoice();
                             goto q;

                    case 3 : display();
                             goto q;

                    case 4 : mdisplay();
                             goto q;

                    case 5 : goto q;

                    case 6 : mdelete();
                             goto q;

                    default : printf("Error\n");
                              goto q;
        		}
		         break;
      case 3: printf("\tExiting...\n");
      break;
      default : printf("error\n");
      break;
	}
}

输出

 * * * * * * * * * *  * * * * * * * * * * * * * * * * * *
                Please Select an Option:
 * * * * * * * * *  * * * * * * * * * * * * * * * * * * *
              01. ADMINISTRATOR
              02. CUSTOMER
              03. EXIT
        Please Enter an Option:
Please Enter an Option: 2

  * * * * * * * * * * * * * * * * * * * * * * * * * * * *
               Plese Select an Option:
  * * * * * * * * * * * * * * * * * * * * * * * * * * * *
        01.BILL
        02.INVOICE
        03.DISPLAY
        04.MYCART
        05.MAIN MENU
        06.DELETE ITEMS IN CART

        Please Enter an Option: 2
There are No Products in your Cart
* * * * * * * * * * * * * * * * * * * * * * INVOICE * * * * * * * * * * * * * *  * * * * * * * * 
product number  | product name  | price | quantity      | amount        |
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
Amount Payable:0.000000
Thank you for Shopping
Visit Again

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