How to execute a piece of code only once?

Question

I have an application which has several functions in it. Each function can be called many times based on user input. However I need to execute a small segment of the code wi

Answer 1

could you do this

have a function that return a bool or some datatype called init

I made it happen this way, you need static bool to make it happens

bool init()
{
  cout << "Once " <<endl;
  return true||false;// value isn't matter
}

void functionCall()
{
    static bool somebool = init(); // this line get executed once
    cout << "process " <<endl;
}

int main(int argc, char *argv[])
{
    functionCall();
    functionCall();
    functionCall();

    return EXIT_SUCCESS;
}

for C

#include <stdio.h>

void init()
{
    printf("init\n");
}

void process()
{
    static int someint = 0;
    if(someint == 0)
    {
        someint = 1;
        init();
    }
    printf("process\n");
}


int main()
{
    process();
    process();
    process();
    return 0;
}

Answer 2

do { 
     //execute code once
} while (false)