what is funtions in c code example

Example 1: function in c

#include <stdio.h>

void function(){
  printf("I am a function!");
}

int main(void) {
  
  function();
}

Example 2: functions in c programming

#include <stdio.h>
/* function return type is void and it doesn't have parameters*/
void introduction()
{
    printf("Hi\n");
    printf("My name is Chaitanya\n");
    printf("How are you?");
    /* There is no return statement inside this function, since its
     * return type is void
     */
}

int main()
{
     /*calling function*/
     introduction();
     return 0;
}