C++中的这个问题怎么解决

#include
int main()
{
int base, exponent;
std::cout << "Please enter the base and the exponent :" << std::endl;
std::cin >> base >> exponent;
long result = 1;
if (base == 0 && exponent == 0)
{
result = 0;
std::cout << "the " << exponent << " power of "
<< base << " is " << result;

}
else if (base == 0 && exponent != 0)
{
result = 0;
std::cout << "the " << exponent << " power of "
<< base << " is " << result;
}
else if (base != 0 && exponent == 0)
{
result = 1;
std::cout << "the " << exponent << " power of "
<< base << " is " << result;
}
else

{}
if ( exponent < 0)
std::cout << " Exponent can't be smaller than 0." << std::endl;
else
{
for (int i = 1; i <= exponent; i++)
result = result * base;
std::cout << "the " << exponent << " power of "
<< base << " is " << result;
std::cout << std::endl;
}
}
return 0;
}

这是怎么回事，为什么会出现这种情况？
[Error] expected unqualified-id before 'return'
[Error] expected declaration before '}' token

你多了一个}。根据你代码的意思，应该是else下一个空的{}中的}应该不要吧

我看了一下，return上面那个括号多余了，你测试出来了么

恩 ，return 0；前面那个}是多余的，编译器会认为这个括号和main的{相匹配，所以对于后面的return会报错。

最好把你的if else整理成有条理些。上面的if else可以改成如下，看着条件就清晰了

 int main()
{
int base, exponent;
std::cout << "Please enter the base and the exponent :" << std::endl;
std::cin >> base >> exponent;
long result = 1;
if(base==0){//base分成等于0和不等于0
     if(exponent == 0){//exponent分成等于0和不等于0
        result = 0;
        std::cout << "the " << exponent << " power of " 
        << base << " is " << result;
     }else{
         result = 0;
        std::cout << "the " << exponent << " power of " 
        << base << " is " << result;
     }
}else{
    if(exponent == 0){//exponent分成等于0，小于0，以及大于0
        result = 1; 
        std::cout << "the " << exponent << " power of " 
        << base << " is " << result; 
    }else if ( exponent < 0)
        std::cout << " Exponent can't be smaller than 0." << std::endl;
    else{
        for (int i = 1; i <= exponent; i++){
            result = result * base;
        }
        std::cout << "the " << exponent << " power of " 
        << base << " is " << result;
        std::cout << std::endl;
    }
}
return 0;
}

return 0；前面多了一个 }

这种括号匹配的错误，最好是借助编辑工具来查。
VS 快捷键：CTRL + ]
UltraEdit 快捷键： CTRL +B

将return 0 前面的那个｝去掉就对了