fibn.c

#include <stdio.h>
#include <stdlib.h>

void main()
{
    int Number;
    int FibN;
    int FibN1;
    int FibN2;
    int i;

    printf("The Fibonacci Numbers \n");
    printf("Please enter a number : ");
    scanf("%d", &Number);

    if(Number <= 1)
        printf("Fibonacci Numbers of %d = 1\n", Number);
    else
    {
        FibN2 = 0;
        FibN1 = 1;
        for( i = 2; i <= Number; i++)
        {
            FibN = FibN1 + FibN2;
            FibN2 = FibN1;
            FibN1 = FibN;
        }
        printf("Fibonacci Numbers of %d\n = %d\n", Number, FibN);
    }
}