Question

我是初学者学习代码，我正在复制用于编程教学的YouTube视频。但是当我编写代码时，它会导致一些错误。

以下是代码：

#include <iostream>
using namespace std; 
int main()
{
    int num1 , num2;

    cout<< " Enter number 1 and number 2 \n";
    cin>> num1 >> num2;

    if (num1 == num2);
        cout<< "The both numbers are equal \n";

    else if (num1> num2)
        cout<< "Number 1 is greater than number 2 \n";
    else (num1< num2)
        cout<< "Number 2 is greater than number 1 \n";

    return 0;
}

Answer 1

请注意，;表示表达式结束，因此您应该更改

if (num1 == num2);

到

if (num1 == num2)

且else不需要条件，因此请更改

else (num1< num2)

到

else

Answer 2

;条件检查后您不需要if

如果您想进行条件检查，则应使用else if，在这种情况下else是不够的：

#include <iostream>
using namespace std; 
int main()
{
    int num1 , num2;

    cout<< " Enter number 1 and number 2 \n";
    cin>> num1 >> num2;

    if (num1 == num2)
        cout<< "The both numbers are equal \n";
    else if (num1> num2)
        cout<< "Number 1 is greater than number 2 \n";
    else if (num1< num2)
        cout<< "Number 2 is greater than number 1 \n";  
    return 0;
}

Answer 3

;   is not placed after `if` condition

此外，否则没有得到条件......它总是检查对应的if的否定。实际上，如果if的条件不能保存else块中的代码，则执行....通过更改

 else (num1< num2)
        cout<< "Number 2 is greater than number 1 \n";

到

 else
        cout<< "Number 2 is greater than number 1 \n";

你的问题将得到解决。

这个c ++代码有什么问题

3 个答案: