pvjc20/du3/program.c

#define _XOPEN_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

int main()
{
    
    char dateStr[11];
    struct tm t;
    
    fgets(dateStr, 11, stdin);
    
    strptime(dateStr, "%d.%m.%Y", &t);
    
    t.tm_mday += 7;
    
    strftime(dateStr, sizeof(dateStr), "%d.%m.%Y", &t);
    
    printf("\n%s", dateStr);
    exit(EXIT_SUCCESS);

    return 0;
}