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感谢楼主 楼主辛苦

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

int top ,S[1000];

void push(int x){
    S[++top] = x;
}

int pop(){
    top--;
    return S[top+1];
}

int main(){
    int a,b;
    top = 0;
    char s[100];
    printf("输入");
    while(scanf("%s",s) !=EOF){
        if( s[0]=='+') {
            a = pop();
            b = pop() ;
            push(a + b);
        } else if (s[0] =='-'){
            a = pop();
            b = pop() ;
            push(a - b);
        } else if(s[0] =='*'){
            a = pop() ;
            b = pop() ;
            push(a * b);
        }else {
            push(atoi(s));
        }
    }
    
    printf("%d/n",pop());
    
    return 0;
}

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