beta

#include <stdio.h>
#include <conio.h>
#include <locale.h>
#include <math.h>
#include <windows.h>
#include <string.h>

typedef struct {
    char surname[50];
    int number;
    double weight;
} info;

int main() {
    setlocale(0, "");
    system("chcp 1251");
    system("cls");

    FILE* f;
    int n, i;
    info human;
    char filename[50];

    printf("Enter file name >> ");
    scanf("%s", filename);

    if ((f = fopen(filename, "r")) == NULL) {
        f = fopen(filename, "a");
        printf("Enter number of members >> ");
        scanf("%d", n);
        for (i=0; i<n; i++) {
            printf("For member %d :\n", i);
            printf("Surname >> ");
            scanf("%s", human.surname);
            fprintf(f, "%s", human.surname);
            printf("Number. >> ");
            scanf("%d", human.number);
            fprintf(f, "%d", human.number);
            printf("Weight >> ");
            scanf("%lf", human.weight);
            fprintf(f, "%lf", human.weight);
        }
        printf("File %s was created!", filename);
        system("pause");
    }
    fclose(f);
    system("cls");
    f = fopen(filename, "r");
    while (!eof(f)) {
        fscanf(f, "%s%d%lf", human.surname, human.number, human.weight);
        printf("%2d | %10s | %4d | %5lf |\n",
                human.surname, human.number, human.weight);
    }
    system("pause");
    return 0;
}