小弟新手，想找个简单的能计算数字加减乘除计算器，求高手给个简单易懂的c程序

[ 本帖最后由 pingweiqiang 于 2010-3-15 15:44 编辑 ]

#include <stdio.h>
#include <stdlib.h>

char symbol[] = {'+', '-', '*', '/', '='};
enum {
    Add = 0,
    Dec,
    Mul,
    Div,
    Equ,
    Max
};
int Judge(char c)
{
    switch (c)
    {
        case '+':
            return Add;
        case '-':
            return Dec;
        case '*':
            return Mul;
        case '/':
            return Div;
        case '=':
            return Equ;
        default:
            return -1;
    }
}
double Calculate(double a, double b, int flag)
{
    switch (flag)
    {                                                                                                            
        case Add:                                                                                                
            return a+b;                                                                                          
        case Dec:                                                                                                
            return a-b;                                                                                          
        case Mul:                                                                                                
            return a*b;                                                                                          
        case Div:                                                                                                
            return a/b;                                                                                          
        default:                                                                                                  
            printf("Error!\n");                                                                                   
            exit(1);                                                                                             
    }                                                                                                            
}
int main(void)                                                                                                   
{                                                                                                                 
    double a, b, answer;                                                                                          
    char c;                                                                                                      
    int flag;                                                                                                     
    printf("Input format: a <symbol(+,-,*,/)> b <enter>\n");                                                        
                                                                                   
    while (1)                                                                                                     
    {                                                                                                            
        printf(">>> ");                                                                                          
        scanf("%lf", &a);                                                                                         
        while ((flag = Judge(c = getchar())) == -1);                                                              
        scanf("%lf", &b);                                                                                         
        while ((c = getchar()) != '\n');                                                                          
        answer = Calculate(a, b, flag);                                                                           
        printf(">>> %lf\n", answer);                                                                              
    }                                                                                                            
                                                                                                                  
}        
随手写了个，功能不是很强，没有加纠错

不错，刚学有点难啊!