无法在语法问题中返回简单函数

Question

为什么我得到错误代码 ID 返回 1 退出状态我需要练习函数调用，但我很难调用 3 个函数。我需要了解如何在这个示例中正确调用函数。我需要声明一个主函数吗？根据练习，我认为我没有。

 #include <iostream>

 using namespace std;
/**
 * Following function prints a message into the console
 */ 
void say_hello(){
    cout << "Hello, World!" << endl;
}
/**
 *  The following function prints the sum of 2 integer numbers into the console, the numbers are 
 *  passed as parameter
 */ 
void print_sum(int a, int b){
    cout << "Sum is: " << a+b << endl;
}

/**
 * The following function calculates the product of 2 integer parameter passed and returs the product to the caller.
 */ 
int getProduct(int a, int b){
    int p = a * b;
    return p;
}

   void writeYourCode(int first, int second){
 // Instruction 1: Please write a statement to call the function say_hello just after this line
        say_hello();

 // Instruction 2: Please write a statement to call the function print_sum and pass first and second as parameter
        print_sum(first, second);

// Instruction 3: Please write a statement to call the function getProduct and pass first and second as parameter, 
 //                catch the return value in an integer variable declared by you. 
 //                Print that integer containing the result into console using cout, there  must be a newline at the end.
 //                You need to print only the result and a new line    
        int total = getProduct(first,second);
        cout << total << endl;

    }

Answer 1

如之前的问题注释中所述，您需要实现一个main()函数。简而言之，您的主要内容是程序的入口点。

因此，您已经正确实现了某些功能，但需要main()才能使用它。它的结构如下：

int main() {
    // you can call your functions from here!
}

关于main()函数，有很多事情需要了解。您可以在此处找到所有详细信息。

Answer 2

你需要在所有函数定义之后编写一个main（）函数。您可以使用 int main 或 void main。如果使用了 void main，则无需返回 0

    int main(){
      int first = 10;
      int second = 3;
      say_hello();
      getProduct(5, 3);
      print_sum(first, second);
      return 0;
}