求助！

nobody_here @ 2024-08-01 21:37:05

#include<bits/stdc++.h>
using namespace std;
int main(){
    stack<char> a;
    char w;
    int n=0,m=0,y=0;
    cin>>w;
    do{
        if(w=='/' || w=='*' || w=='-' || w=='+'){
            n=a.top()-'0';
            a.pop();
            m=a.top()-'0';
            a.pop();
            if(w=='/'){
                y=n/m;
                a.push(y+'0');
            }else if(w=='*'){
                y=n*m;
                a.push(y+'0');
            }else if(w=='-'){
                y=n-m;
                a.push(y+'0');
            }else{
                y=n+m;
                a.push(y+'0');
            }
        }else if(w=='.'){
            /*37*/
        }else{
            a.push(w);
        }
        cin>>w;
    }while(w=='@');
    cout<<a.top()-'0';
    return 0;
}

by zzhhyy1234 @ 2024-08-04 11:14:56

上面那条的c改成w

by zzhhyy1234 @ 2024-08-04 11:18:07

再删去原程序所有-'0'和+'0'(不包括上面加的)

by zzhhyy1234 @ 2024-08-04 11:18:27

就ok了！

by zzhhyy1234 @ 2024-08-04 11:19:46

贴最终代码（亲测AC）

#include<bits/stdc++.h>
using namespace std;
int main(){
    stack<int> a;
    char w;
    int n=0,m=0,y=0,x=0,flag=0;
    cin>>w;
    do{
        if(w=='/' || w=='*' || w=='-' || w=='+'){
            m=a.top();
            a.pop();
            n=a.top();
            a.pop();
            if(w=='/'){
                y=n/m;
                a.push(y);
            }else if(w=='*'){
                y=n*m;
                a.push(y);
            }else if(w=='-'){
                y=n-m;
                a.push(y);
            }else{
                y=n+m;
                a.push(y);
            }
        }else if(w=='.'){
            a.push(x);
            x=0;
            flag=0;
        }else{
            if(flag==0){
                flag=1;
                x=w-'0';
            }
            else{
                x*=10;
                x+=w-'0';
            }
        }
        cin>>w;
    }while(w!='@');
    cout<<a.top();
    return 0;
}

求关

by zzhhyy1234 @ 2024-08-04 11:21:40

还有我自己的代码,可以参考

#include<bits/stdc++.h>
using namespace std;

int main()
{
    stack<int> a;
    int x;
    int flag=0;
    char c;
    while(scanf("%c",&c)!='@'){
        if(c=='@') break;
        if(isdigit(c)){
            if(flag==0){
                flag=1;
                x=c-'0';
            }
            else{
                x*=10;
                x+=c-'0';
            }
        }
        else if(c=='.'){
            a.push(x);
            x=0;
            flag=0;
        }
        else{
            int z=a.top();
            a.pop();
            int y=a.top();
            a.pop();
            switch(c){
                case '+': a.push(y+z); break;
                case '-': a.push(y-z); break;
                case '*': a.push(y*z); break;
                case '/': a.push(y/z); break;
            }
        }
    }
    cout<<a.top();
    return 0;
}

by nobody_here @ 2024-08-07 07:09:02

大佬牛逼，小弟膜拜 @zzhhyy1234

by PrOI_Luo_Yi_cheng @ 2024-08-13 08:56:24

#include <bits/stdc++.h>
using namespace std;

string s;

stack<int> a;

int main(){
    cin >> s;
    int cur = 0;
    for (int i = 0; i < s.size() - 1; i++){
        if (s[i] >= '0' && s[i] <= '9')
            cur = cur * 10 + (s[i] - '0');
        else if (s[i] == '.'){
            a.push(cur);
            cur = 0;
        }
        else{
            int left = a.top();
            a.pop();
            int right = a.top();
            a.pop();
            if (s[i] == '+')
                a.push(left + right);
            if (s[i] == '-')
                a.push(right - left);
            if (s[i] == '*')
                a.push(left * right);
            if (s[i] == '/')
                a.push(right / left);
        }
    }
    cout << a.top();
    return 0;
}