输入三只小猪的体重，比较谁最重，打印出来，我的程序如下，不想用&&，因为我觉得我的思路没错，可程序逻辑就是不对，有没有明眼人帮我看看哪里错了
#include<iostream>
#include "string"
using namespace std;
int main()
{
    float A;
    float B;
    float C;
    cout<<"请输入A的体重"<<endl;
    cin>>A;
    cout<<"请输入B的体重"<<endl;
    cin>>B;
    cout<<"请输入C的体重"<<endl;
    cin>>C;
    cout<<"A的体重"<<A<<endl;
    cout<<"B的体重"<<B<<endl;
    cout<<"C的体重"<<C<<endl;
    if (A>B)
    {
        if (B>=C)
            {cout<<"最重的猪是:A1"<<endl;}
        else
        {
            if(A>C)
                {cout<<"最重的猪是:A2"<<endl;}
            else if (A=C)
                {cout<<"最重的猪是:AC3"<<endl;}
            else
                {cout<<"最重的猪是:C4"<<endl;}

        }
    }
    else if(A=B)
    {
        if(A>C)
            {cout<<"最重的猪是:BA5"<<endl;}
        else if(A=C)
            {cout<<"最重的猪是:BAC6"<<endl;}
        else if(A<C)
            {cout<<"最重的猪是:C7"<<endl;}
    }
    else
    {
        if (B=C)
            {cout<<"最重的猪是:BC8"<<endl;}
        else if(B<C)
            {cout<<"最重的猪是:C9"<<endl;}
        else
            {cout<<"最重的猪是:B10"<<endl;}
    }
    system("pause");
    return 0;
}

先把 if (A=C) 等
都换成 if (A==C) 试试

#include <iostream>
#include <string>
using namespace std;

int main( void )
{
    double a, b, c;
    cout << "请输入A的体重: ";
    cin >> a;
    cout << "请输入B的体重: ";
    cin >> b;
    cout << "请输入C的体重: ";
    cin >> c;
    cout << "A的体重" << a <<endl;
    cout << "B的体重" << b <<endl;
    cout << "C的体重" << c <<endl;

    double heaviest = a;
    string heaviest_list = "A";
    if( b == heaviest )
    {
        heaviest_list.push_back( 'B' );
    }
    else if( b > heaviest )
    {
        heaviest = b;
        heaviest_list = "B";
    }
    if( c == heaviest )
    {
        heaviest_list.push_back( 'C' );
    }
    else if( c > heaviest )
    {
        heaviest = c;
        heaviest_list = "C";
    }
    cout << "最重的猪是: " << heaviest_list << endl;
}

#include <iostream>
#include <string>
using namespace std;

int main( void )
{
    double weights[3]; // 以后只需要改这个3就能适应更多数量的猪
    for( size_t i=0; i!=std::size(weights); ++i )
    {
        cout << "请输入" << char('A'+i) << "的体重: ";
        cin >> weights[i];
    }

    for( size_t i=0; i!=std::size(weights); ++i )
    {
        cout << char('A'+i) << "的体重: " << weights[i] << '\n';
    }

    double heaviest = weights[0];
    string heaviest_list;
    for( size_t i=0; i!=std::size(weights); ++i )
    {
        if( weights[i] == heaviest )
            heaviest_list.push_back( char('A'+i) );
        else if( weights[i] > heaviest )
        {
            heaviest = weights[i];
            heaviest_list = char('A'+i);
        }
    }

    cout << "最重的猪是: " << heaviest_list << endl;
}

收到的鲜花

• 后卿 于 2022-05-13 11:18 送鲜花  1朵   附言：多谢多谢，原来是=和==的问题