c++ - 错误1 error C4430 : missing type specifier - int assumed. 注意:C++不支持default-int

Question

#include<iostream>

using namespace std;

template <class T>
void myswap(T & tmp1, T & tmp2)
{    
    T temp;
    temp = tmp1;
    tmp1 = tmp2;
    tmp2 = temp;
    return;
}

main()
{
    int x = 1;
    int y = 20;
    double p = 10.9, q = 23.36;
    char s = 'o', t = 'u';

    myswap(x, y);
    cout << "x=" << x << "and y=" << y << endl;

    myswap(p, q);
    cout << "p=" << p<< "and q=" << q << endl;

    myswap(s, t);
    cout << "s=" << s << "and t=" << t << endl;

    return 0;
}

我使用 visual studio 2013。当我运行这段代码时，编译器会给我消息“错误:缺少类型说明符 - 假定为 int。C++ 不支持默认 int”。

Answer 1

main函数的返回类型应该是int

int main()