keywords:计算器代码、Calculator

#include "stdio.h"
#include "string.h"
#define MAX 1001

double stack[MAX];
int tail;

int main(){
    int a;
    while(scanf("%d ",&a)&&a!=0){
        tail=0;
        stack[++tail]=1.0*a;//tail始终指向末尾数字位置
        //1.入栈所有数据(如果遇到*/号,只更新栈尾)
        char ch1,ch2;
        while(scanf("%c %d%c",&ch1,&a,&ch2)!=EOF){
            if(ch1=='+'){
                stack[++tail]=1.0*a;//push
            }else if(ch1=='-'){
                stack[++tail]=-1.0*a;//push neg
            }else if(ch1=='*'){
                stack[tail]=stack[tail]*a;//update tail
            }else if(ch1=='/'){
                stack[tail]=stack[tail]/(double)a;//updata tail
            }
            if(ch2!=' ')
                break; 
        }
        //2.把栈里头的东西全部加起来,求和
        double result=0;
        for(int i=1;i<=tail;i++)
            result+=stack[i];
        printf("%.2lf\n",result);
    }
    return 1;
}

原文:https://blog.csdn.net/JIEJINQUANIL/article/details/51405381