自己编写的一个程序，不知道错在哪里了

[pp25210]

#include<stdio.h>
void input();
void add();
void subtract();
void multiply();
void divide();
int main()
{
char ch;
printf("Enter the operation of your choice:");
printf("a.add s.subtract\n");
printf("b.multiply d.divide \nq.quit\n");
ch=getchar();
do
{
switch(getchar())
{
case 'a':add();
break;
case 's':subtract();
break;
case 'b':multiply();
break;
case 'd':divide();
default:
printf("input error,please input 'a' 's' 'b' 'd' 'q '\n");
}
}
while(ch=='q');
printf("bye.\n");
return 1;
}


void input()
{
float a[2];
int m,n;
printf("Enter first number:");
do
{
m=scanf("%f",&a[0]);
if(m==0)
{
printf("input errror!please enter an number such as 2.5,-2 or -1.788e2\n");
continue;
}
else
{
printf("Enter second number:");
n=scanf("%f",&a[1]);
if(n==0)
{
printf("input errror!please enter an number such as 2.5,-2 or -1.788e2\n");
continue;
}
}
while(m*n!=0);
}

void add()
{
printf("%f + %f =%f \n",a[0],a[1],a[0]+a[1]);
}


void subtract()
{
printf("%f - %f =%f \n",a[0],a[1],a[0]-a[1]);
}



void multiply()
{
printf("%f * %f =%f \n",a[0],a[1],a[1]*a[0]);
}


void divide()
{
while(a[1]==0)
{
printf("enter a number other than 0:");
scanf("%f",&a[1]);
}
printf("%f / %f =%f \n",a[0],a[1],a[1]/a[0]);
}
根据用户输入进行加，减，乘，除运算。

[LinuxBirdMan]

应该是：

while(ch！='q');

[無_1024]

ls的也是其中之一
还有就是一个编程习惯

[heartgoon2010]

input()函数都没调用，参与运算的数是怎么输入的？仔细琢磨琢磨吧

[qwangwei1231]

楼主自己对照下吧！
测试可以通过！你试下

// TEST11.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include<stdio.h>
void input();
void add();
void subtract();
void multiply();
void divide();

float a[2];   //必须定义为全局变量

int main()
{
	char ch;
	
	while(1)
	{
		printf("Enter the operation of your choice:\n");
		printf("a.add s.subtract\n");
		printf("b.multiply d.divide \nq.quit\n");
		fflush(stdin);
		ch=getchar();
		if(ch == 'q')
			break;
		input();
		switch(ch)
		{
		case 'a':add();   
			break;
		case 's':subtract();
			break;
		case 'b':multiply();
			break;
		case 'd':divide();
			break;  //这少了个Break
		default:
			printf("input error,please input 'a' 's' 'b' 'd' 'q '\n");
		}
	}
	printf("bye.\n");
	return 1;
}


void input()
{
	
	int m,n;
	printf("Enter first number:");
	do
	{
		m=scanf("%f",&a[0]);
		if(m==0)
		{
			printf("input errror!please enter an number such as 2.5,-2 or -1.788e2\n");
			continue;
		}
		else
		{
			printf("Enter second number:");
			n=scanf("%f",&a[1]);
			if(n==0)
			{
				printf("input errror!please enter an number such as 2.5,-2 or -1.788e2\n");
				continue;
			}
		}
		
	}while(m*n==0);
}	
void add()
{
	printf("%f + %f =%f \n",a[0],a[1],a[0]+a[1]);
}
	
	
void subtract()
{
	printf("%f - %f =%f \n",a[0],a[1],a[0]-a[1]);
}
	
	

void multiply()
{
	printf("%f * %f =%f \n",a[0],a[1],a[1]*a[0]);
}
	
	
void divide()
{
	while(a[1]==0)
	{
		printf("enter a number other than 0:");
		scanf("%f",&a[1]);
	}
	printf("%f / %f =%f \n",a[0],a[1],a[1]/a[0]);
}

[thelover]

天那，你完全就是在靠自己的臆想在编程。仔细的看一本书吧！

[ineedpower]

[code = c/c++]
int a
[/code]

[ineedpower]

[code = C/C++]
int a;
[/code]

[ineedpower]

int a;

[sfd1234]

楼主，你不能自己一步一步调试？调试是必须的，再NB的NB也不敢说不用调试的！

[AnYidan]

楼主可以单步跟踪一下，看看问题出在哪里

[pp25210]

我调试了，可是看不懂错误提示