#include <stdio.h>
#include <math.h>
#define EPS 0.000001
#include <stdlib.h>
#include <string.h>
int search_number(FILE *f, double x);

int search_number(FILE *f,double x)
{
    double a;
    while (fscanf(f, "%lf", &a) == 1) {
        if (fabs(a -x) < EPS) {

            return 1;
        }
    }

    return 0;
}

int main(void)
{
    int found ;
    char *res = (char*)calloc(100,sizeof(char));

    FILE *f;
    double x;
    printf("Please write down filename of input file to read:\n");
    fgets (res, 100,stdin);
    res[strlen(res)-1]=0;
    if (strlen(res)==0) {
        printf("You haven't entered file name. The programme will be terminated!\n");
        free(res);
        return 1;
    }
    printf("Your file:[%s]\n",res);
    f = fopen(res, "r");
    if (f == NULL) {
        perror("Error occurred while opening file");
        free(res);
        return 1;
    }
    printf("Please enter number to find in file:\n");
    if(scanf("%lf",&x)==1)
    {
        found=search_number(f, x);

    }
    else
    {
        printf("ERROR\n");
    }

    fclose(f);

    if (found == 1) {
        printf("Number is found!\n");
    } else {
        printf("Number isn't found!\n");
    }
    return 0;
}