Class_Work_26.04_my_work

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

struct exchangeRate
{
    float bynToUsd;
    float usdToByn;
    float bynToEur;
    float eurToByn;
};


int main()
{
    struct exchangeRate* rate = malloc(sizeof(struct exchangeRate));
    FILE* f = fopen("d:\\db.bin", "rb");

    if (f == NULL)
    {
        f = fopen("d:\\db.bin", "wb");

        rate->bynToUsd = 10;
        rate->usdToByn = 11;
        rate->bynToEur = 12;
        rate->eurToByn = 13;

        fwrite(rate, sizeof(struct exchangeRate), 1, f);

        fclose(f);
        return 0;

    }

        fread(rate, sizeof(struct exchangeRate),1, f);

        printf("%.4f\n", rate->bynToUsd);
        printf("%.4f\n", rate->usdToByn);
        printf("%.4f\n", rate->bynToEur);
        printf("%.4f\n", rate->eurToByn);

    fclose(f);
    free(rate);
}