A program to print febonacci series upto first 20 trems

#include <stdio.h>
#include <conio.h>

int main()
{
    int a = 0;
    int b = 1;
    int i,sum;
    
    for(i = 0;i<20;i++)
    {
        sum = a+b;
        printf("%d\n",sum);
         
        a = b;
        b = sum;
    }
}