pvjc22/a1/program.c

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


int main(){
    char Dnes_Datum[300];
    int ch=getchar(),counter=0;
    int id=0;
    for(id=0;ch!=EOF;id++){
        if(ch=='.'){
            ch=' ';
        }
        Dnes_Datum[id]=ch;
        if(ch=='\n'){
            counter++;
        }
        ch=getchar();
        if(Dnes_Datum[id]=='\n'&&ch=='\n'){
            break;
        }
    }
	Dnes_Datum[id]='\0';

	for(int i=0;i<strlen(Dnes_datum);i++){
		if((Dnes_Datum[i]>='0'&&Dnes_Datum[i]<='9')||Dnes_Datum[i]==' ');
		else {
			printf("Neplatny datum.\n");
			return EXIT_SUCCESS;
		}
	}


    char *start=Dnes_Datum, *end=NULL;
    time_t t=time(NULL);

    for(int idx=0;idx<counter;idx++){
        struct tm *D_D;
        struct tm *NW_D;

        D_D = localtime(&t);

        D_D->tm_mday=strtol(start,&end,10);
        start=end;
        D_D->tm_mon=strtol(start,&end,10)-1;
        start=end;
        D_D->tm_year=strtol(start,&end,10)-1900;
        start=end+1;
        time_t nex_week=mktime(D_D)+604800;

        NW_D=localtime(&nex_week);

        printf("%d.%d.%d\n\n",NW_D->tm_mday, NW_D->tm_mon+1,NW_D->tm_year+1900);
    }

        return EXIT_SUCCESS;

}