what happen during the execution of code

[gajya]

I need help to understand program

#include<stdio.h>

void function (void);


int main (void)
{
  int a = 5;


  printf ( "\n a : %d", a);  
  
  function();
     
    return 0;
}


void function (void)


{
	int b = 15;
	b++;
	printf ("\n b : %d", b);  
}

a : 5
b : 16

There are two variables a and b

I do not understand what happen during the execution of code

How long variable a will exit ?
When we call function how long variable b will exit ?
Where does it will store stack or heap ?

any help would be appreciated