lab4

#include <stdio.h>

double input(void);

int main(){
    double pgrnst=input(), zs1, zs2=1, rznst;
    int fib1=1, fib2=1, buf;
    int i=1;
    do{
        zs1 = zs2;
        buf = fib2;
        fib2 += fib1;
        fib1 = buf;
        zs2 = (double)fib2/fib1;
        rznst = (zs2-zs1)<0 ? zs1-zs2: zs2-zs1;
        i++;
    }
    while(rznst>pgrnst);
    printf("%.10lf\n", zs2);
    printf("Nomer shaga: %d\n", i);
}
double input(){
    double a;
    while(scanf("%lf", &a)!=1 && a>0){
        while(getchar()!='\n');
        printf("Enter correct value: ");
    }
    return a;
}