C ++Python's OrderedDict

Themain()Functions are global functions. Used to start the execution of the program. Every program should havemain(). The command line arguments argc and argv are optional.

main()The standard prototype of the method is as follows.

int main(){ body }
OR
int main(int argc, char　*argv[])
{ body }

Here,

argc-The number of arguments passed from the environment to the program.

argv-Pointer to the first element of the array.

The following is an example main()

Example

#include <iostream>
using namespace std;
int sum(int x, int y) {
　　　int s = x　+　y;
　　　cout << "The sum of numbers: " << s;
}
int main() {
　　　sum(28,　8);
　　　return 0;
}

Output result

The sum of numbers:　36

In the above program, this code exists insum()Calculate the sum of two numbers.

int sum(int x, int y) {
　　　int s = x　+　y;
　　　cout << "The sum of numbers: " << s;
}

Themain()The method is being calledsum()

sum(28,　8);