/* Program to print Fibonacci numbers.  Requests the two starting values
   and the amount to compute.
*/

#include <stdio.h>

void print_Fibonacci (void);

int F1, F2, num;     /* Two starting values, and the number to calculate */

main () {
    printf("\tFibonacci numbers\nEnter the two Fibonacci starting values: ");
    scanf("%d %d", &F1, &F2);
    printf("Enter the number of values to compute: ");
    scanf("%d", &num);
    print_Fibonacci();
}

void print_Fibonacci (void) {
    /* Prints num Fibonacci numbers, starting with F1 & F2 */
    int nextfib;  /* the next number in the sequence */

    /* Let num be the number still to print. */
    while (num > 0) {              /* more to print */
        nextfib = F1 + F2;         /* compute next */
        printf("%d\n", nextfib);   /* print */
        F1 = F2; F2 = nextfib;     /* 'slide' the numbers down one, ready
                                      for the next loop iteration. */
        num--;                     /* one fewer number still to print */
    }
}