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/* Note:Your choice is C IDE */
/*一个具有两个数加减乘除功能的计算器*/
#include "stdio.h"
void main()
{
    int iFirNum,iSecNum,iResult;
    char ch,ch1;
    printf("请输入表达式如5+6= 然后按回车键:");
    scanf("%d%c%d%c",&iFirNum,&ch,&iSecNum,&ch1);
    switch(ch)
    { 
        case '+':
		   iResult=iFirNum+iSecNum;
		   printf("%d+%d=%d\n",iFirNum,iSecNum,iResult);
		   break;
        case '-':
           iResult=iFirNum-iSecNum;
           printf("%d-%d=%d\n",iFirNum,iSecNum,iResult);
           break;
        case '*':
           iResult=iFirNum*iSecNum;
           printf("%d*%d=%d\n",iFirNum,iSecNum,iResult);
           break;
        case '/':    
           iResult=iFirNum/iSecNum;  
           printf("%d/%d=%d\n",iFirNum,iSecNum,iResult);
           break;
        default:
           printf("输入表达式错误或该计算器不具备 %ch 功能\n",ch);
            
    } 
{
	printf("ID: 2013304117\n");
}      
}

总结：.程序稍微简单了点，初学者应多敲打代码，对编程中出现的错误细心地找出来并改正。