substring或将数组打印到C++中的num位置

string str = "Hello, world!";
string sub = str.substr(0, 5); // 提取前5个字符
cout<< sub<< endl; // 输出 "Hello"

int num = 42;
cout << "The value of num is: "<< num<< endl; // 输出 "The value of num is: 42"

string str = "Hello, world!";
string sub = str.substr(0, 5); // 提取前5个字符
int num = 42;
cout << "The value of num is: "<< num << ", and the substring is: "<< sub<< endl; // 输出 "The value of num is: 42, and the substring is: Hello"