C语言刚开始学者求帮助

#include<stdio.h>
#include<stdlib.h>
int suanqian(int,int);
main(){
start: int i,a,b,c,need,put,rest;
int price[10]={1,2,2,3,4,6,6,6,6,6};
char*name[10]={“怡宝”,”可乐”,”雪碧”,”酸奶”,”橙汁”,”咖啡”,”红牛”,”脉动”,”芬达”,”奶茶”};
for(i=0;i<10;i++){
printf(“%d.%s”,i+1,name[i]);printf(” %d元\n”,price[i]);
}
bianhao:printf(“请输入物品的编号”);
scanf(“%d”,&a);
if(a>10){
printf(“输入有误，请重新输入\n”);
goto bianhao;
}
system(“CLS”);printf(“您选择了%s”,name[a-1]);
printf(“\n请输入物品的数量”);
scanf(“%d”,&b);
int suanqian(int x,int y){
int z;
z=x*a;
return z;
}
need=suanqian(b,price[i-1]);
printf(“所需费用%d元”,need);
buzu:printf(“请投币”);
scanf(“%d”,&put);
if(put==need)
{printf(“谢谢惠顾”);}
else if(put<need)
{printf(“支付余额不足,退回%d元\n”,put);goto buzu;}
else if(put>need){
rest=put-need;
printf(“找回零钱%d元,谢谢惠顾”,rest);}
printf(“继续消费请输入0,结束消费请输入1”);
scanf(“%d”,&c);if(c==0){system(“CLS”);goto start;}
return 0;}
int suanqian(int x,int y){
int z;
z=x*a;
return z;
这里总提示本人函数定义非法为什么啊。本人不会改。有劳各位高手。

解决方案

1.不是深层嵌套一般不推荐使用goto
2.suanqian函数里z=x*a;应该是z=x*y;吧
3.别在函数里定义函数

#include<stdio.h>
#include<stdlib.h>
int suanqian(int,int);
int main(){
start:	int i,a,b,c,need,put,rest;
	int price[10]={1,2,2,3,4,6,6,6,6,6};
	char*name[10]={"怡宝","可乐","雪碧","酸奶","橙汁","咖啡","红牛","脉动","芬达","奶茶"};
	for(i=0;i<10;i++){
		printf("%d.%s",i+1,name[i]);printf("   %d元\n",price[i]);
	}
bianhao:printf("请输入物品的编号");
	scanf("%d",&a);
	if(a>10){
		printf("输入有误，请重新输入\n");
		goto bianhao;
	}
	system("CLS");printf("您选择了%s",name[a-1]);
	printf("\n请输入物品的数量");
	scanf("%d",&b);
	need=suanqian(b,price[i-1]);
	printf("所需费用%d元",need);
buzu:printf("请投币");
	scanf("%d",&put);
	if(put==need)
	{printf("谢谢惠顾");}
	else if(put<need)
	{
		printf("支付余额不足,退回%d元\n",put);goto buzu;
	}
	else if(put>need){
		rest=put-need;
		printf("找回零钱%d元,谢谢惠顾",rest);
	}
	printf("继续消费请输入0,结束消费请输入1");
	scanf("%d",&c);if(c==0){system("CLS");goto start;}
	return 0;
}
int suanqian(int x,int y){
	int z;
	z=x*y;
	return z;
}