Вторая задача второй контрольной работы

exam2_task2.cpp

#include <cstdio>
#include <cstring>
#include <cstdlib>

union Date
{
    struct
    {
        char year[5];
        char mounth[3];
        char day[3];
    };
    char toCmp[11];
};

int main(void)
{
    printf("Exam 2, Task 2. Minimum date.\nAuthor: Tereshin Roman\nFilename = ");
    char fname[540];
    scanf("%s", fname);
    FILE *file = fopen(fname, "r");
    if (!file)
    {
        printf("File not found\n");
        return 1;
    }

    Date min;
    strcpy(min.toCmp, "9999\199\199");
    Date current = min;
    char buf[1024];
    for (;;)
    {
        if(fscanf(file, "%*[^0-9]") == EOF)
            break;

        fscanf(file, "%[0-9]", buf);
        if (atoi(buf) > 31)
            continue;
        else
            strcpy(current.day, buf);

        if (fgetc(file) != '.')
            continue;

        fscanf(file, "%[0-9]", buf);
        if (atoi(buf) > 12)
            continue;
        else
            strcpy(current.mounth, buf);

        if (fgetc(file) != '.')
            continue;

        if (fscanf(file, "%[0-9]", buf) == 0)
            continue;
        if (atoi(buf) > 9999)
            continue;
        else
            strcpy(current.year, buf);

        if (fgetc(file) == EOF)
            break;

        current.toCmp[4] = '\1';
        current.toCmp[7] = '\1';
        if (strcmp(current.toCmp, min.toCmp) < 0)
            min = current;
    }

    min.toCmp[4] = '\0';
    min.toCmp[7] = '\0';
    printf("Minimum date: %s.%s.%s\n", min.day, min.mounth, min.year);

    fclose(file);

    return 0;
}