1.C++入门

#include "iostream"void print_add(int a,int b);int int_add(int a,int b);int main(){    using namespace std;    cout<<"hello\r\n";    print_add(1,2);}void print_add(int a,int b){    using std::cout;    cout<<"a+b="<<int_add(a,b);}int int_add(int a,int b){    std::cout<<"a is "<<a<<"\r\nb is "<<b<<std::endl;    return a+b;}