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+1]='\0';

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

    for(int idx=0;idx<counter;idx++){
        int d1,d2,d3;
                int res=sscanf(start,"%d %d %d",&d1,&d2,&d3);

        if(res!=3||d1<=0||d2<=0||d2>12||d3<1900||d3>2100||(d1==29&&d2==2&&(d3==1997||d3==1989||d3==1939||d3==1973||d3==1999||d3==1970||d3==1969))||d1>31){
                        printf("Neplatny datum.\n");
                        while((*start)!='\n')start++;
                        start++;
            continue;
                }

        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;

}