以前讲课的时候，给学生讲解编的一个程序
最后1页，出现总计
第1页，不出现总计
程序完整代码
函数调用形式
#include "stdio.h"
#include "stdlib.h"
#include "windows.h"
#define MAX 50
#define LEN 20
//购买商品，并修改商品数量数组，该数组通过传地址调用
void init_goods_buy(int goods_num[])
{
int i,num;
printf("\n\t说明：\n\t请分别输入所购买商品的编号\n\t(编号范围0-%d，不要超过哦，程序不做异常检查)\n\t和数量(实际购买量)\n",MAX-1);
printf("\t输入格式采用（商品序号 商品数量）\n\t（用空格隔开哦，然后回车再输入第二件商品，\n\t以此类推），最后再输入数字-1 -1作为结束\n");
printf("\n\t下面模拟超市扫描商品过程\n");
for(;1;)
{
printf("\t");
scanf("%d %d",&i,&num);
if(i==-1) break;
if(i>49)
{
printf("编号错误，请重新输入!\n");
continue;
}
goods_num[i]=num;
}
}
//打印商品小票（不分页）
void print_goods_bill_no(char goods_name[ ][LEN],double goods_pr[],int goods_num[])
{
int i;
double total=0.0;
printf("\n\n\t商品编号 商品名称 商品单价 商品数量 \t商品小计\n");
printf("\t========================================================\n");
for(i=0;i<MAX;i++)
{
if(goods_num[i]!=0)
if(strlen(goods_name[i])<=8)
printf("\t%-10d%-10s%8.2f%10d%18.2f\n",i,goods_name[i],goods_pr[i],goods_num[i],goods_pr[i]*goods_num[i]);
else
printf("\t%-10d%-.6s... %8.2f%10d%18.2f\n",i,goods_name[i],goods_pr[i],goods_num[i],goods_pr[i]*goods_num[i]);
tot5al+=(goods_pr[i]*goods_num[i]);
}
printf("\t========================================================\n");
printf("\t总计：%50.2f\n",total);
}
//打印商品小票（分页）
void print_goods_bill_yes(int count,char goods_name[ ][LEN],double goods_pr[],int goods_num[])
{
int i=1,j,k=0;
int order[MAX/5];
double total=0.0;
for(j=0;j<MAX;j++)
if(goods_num[j]!=0)
if(i++%5==1)
order[k++]=j;
if(count<=5)
{
printf("\n\n\t商品编号 商品名称 商品单价 商品数量 \t商品小计\n");
printf("\t========================================================\n");
if(count==0)
printf("\n\t\t\t无购物信息!\n\n");
else
{
for(i=0;i<MAX;i++)
{
if(goods_num[i]!=0)
if(strlen(goods_name[i])<=8)
printf("\t%-10d%-10s%8.2f%10d%18.2f\n",i,goods_name[i],goods_pr[i],goods_num[i],goods_pr[i]*goods_num[i]);
else
printf("\t%-10d%-.6s... %8.2f%10d%18.2f\n",i,goods_name[i],goods_pr[i],goods_num[i],goods_pr[i]*goods_num[i]);
total+=(goods_pr[i]*goods_num[i]);
}
}
printf("\t========================================================\n");
printf("\t总计：%50.2f\n",total);
}
else
{
i=1;
for(;;)
{
printf("\n\n\t商品编号 商品名称 商品单价 商品数量 \t商品小计\n");
printf("\t========================================================\n");
j=0;
for(k=order[i-1];k<MAX;k++)
{
if(goods_num[k]!=0)
{
if(strlen(goods_name[k])<=8)
printf("\t%-10d%-10s%8.2f%10d%18.2f\n",k,goods_name[k],goods_pr[k],goods_num[k],goods_pr[k]*goods_num[k]);
else
printf("\t%-10d%-.6s... %8.2f%10d%18.2f\n",k,goods_name[k],goods_pr[k],goods_num[k],goods_pr[k]*goods_num[k]);
if(++j==5)
break;
}
}
if((count%5==0&&i==count/5)||i==count/5+1)
{
for(j=0;j<MAX;j++)
{
if(goods_num[j]!=0)
total+=(goods_pr[j]*goods_num[j]);
}
printf("\t========================================================\n");
printf("\t总计：%50.2f\n",total);
}
total=0.0;
printf("\n\t|< ");
if(count%5==0)
{
for(i=1;i<=count/5;i++)
printf("%d ",i);
printf(">|\n");
}
else
{
for(i=1;i<=count/5+1;i++)
printf("%d ",i);
printf(">|\n");
}
printf("\n\t请输入显示第几页商品信息(请不要超过最大页数，暂不检查异常)!");
scanf("%d",&i);
system("cls");
}
}
}
//统计购买的商品数量
int count_goods_num(int goods_num[ ])
{
int i,count=0;
for(i=0;i<MAX;i++)
{
if(goods_num[i]!=0)
++count;
}
return count;
}
void print_line_copyright( )
{
//下面固定输出版权信息
//个人根据情况不同，请修改成自己的信息
int split_num=24,split_i; //后面用，不可删除
char split_line='*'; //后面用，不可删除，可更改*为其他符号
printf("\n\n\t");
//我是分割线
for(split_i=1;split_i<=split_num;split_i++)
printf("%c",split_line);
printf("\n");
printf("\t 班级：XXXXXXX\n");
printf("\t 姓名：XXXXXXX\n");
printf("\t 学号：XXXXXXX\n");
printf("\t 系部：信息工程系\n\t");
//我是分割线
for(split_i=1;split_i<=split_num;split_i++)
printf("%c",split_line);
printf("\n");
getchar();
}
void main()
{
double goods_pr[MAX]={1.2,2.3,3.1,2.5,2.8,4.2,2.15,3.05,5.5,6.1,14.3,50.2,15.8,24.6,20.3,15.3,14.0,18.6,21.5,22.5,1.2,2.3,3.1,2.5,2.8,4.2,2.15,3.05,5.5,6.1,14.3,50.2,15.8,24.6,20.3,15.3,14.0,18.6,21.5,22.5,5.5,6.1,14.3,50.2,15.8,24.6,20.3,15.3,14.0,18.6};
char goods_name[MAX][LEN]={"火龙果","桃子","梨","苹果","猕猴桃","康师傅方便面","娃哈哈矿泉水","冰糖雪梨","辣条","榨菜","大葱","香菜","胡萝卜","大白菜","猪头肉","五香牛肉","手帕纸","旺旺雪饼","豆腐","烤红薯","商品1","商品2","商品3","商品4","商品5","商品6","商品7","商品8","商品9","商品10","商品11","商品12","商品13","商品14","商品15","商品16","商品17","商品18","商品19","商品20","商品21","商品22","商品23","商品24","商品25","商品26","商品27","商品28","商品29","商品30"};
int goods_num[MAX]={0};
int count;
//调用选购商品功能代码
init_goods_buy(goods_num);
count=count_goods_num(goods_num);
//清屏吧
system("cls");
//调用打印小票结账功能代码(不分页)
//print_goods_bill_no(goods_name,goods_pr,goods_num);
//调用打印小票结账功能代码(分页)
print_goods_bill_yes(count,goods_name,goods_pr,goods_num);
//调用打印分割线和版权信息功能代码
print_line_copyright( );
getchar();
}