Fibonacci

#include <stdio.h>

int main(){
    /* declaration the variable */
    int i_end;                      /* critical point */
    int x = 0, y = 1, z = 0;        /* initialize the tmp variable */

    /* prompt */
    printf("%s", "Enter the end number: ");
    scanf("%d", &i_end);

    /* Loop output the result */
    while ( ( y + z ) < i_end ){     /* in advance make new third number + the second */
        x = y;                       /* second number -> first number */
        y = z;                       /* third number -> second number */
        z = x + y;                   /* first + second = new third */
        printf("%d ", z);
    }

    return 0;
}