highestAndLowestDate

#include<stdio.h>
#include<string.h>
int main()
{
    int d1=-1,d2=33,m1=-1,m2=13,y1=-1,y2=20000;
    while(1)
    {
        char s[11],s1[3]="",s2[3]="",s3[5]="";
        int count=0,day,month,year;

        printf("Enter a date: ");
        scanf("%s",s);

        for(int i=0; s[i]!='\0'; i++)
        {
            if(s[i]=='/')
            {
                count++;
            }
            if(s[i]!='/' && count==0)
            {
                //strncat concatenates(joins) a string s1 with a character which is in s[i] and 1 is the size of character
                strncat(s1,&s[i],1);
            }
            else if(s[i]!='/' && count==1)
            {
                strncat(s2,&s[i],1);
            }
            else if(s[i]!='/' && count==2)
            {
                strncat(s3,&s[i],1);
            }
        }
        //atoi(string) converts string to int
        day=atoi(s1);
        month=atoi(s2);
        year=atoi(s3);

        if(day==0 && month==0 && year==0)
        {
            printf("Highest date: %d/%d/%d\n",d1,m1,y1);
            printf("Lowest date: %d/%d/%d",d2,m2,y2);
            break;
        }

        //checking if the year is highest or not
        if(year>y1)
        {
            y1=year;
            d1=day;
            m1=month;
        }
        else if(y1==year)
        {
            if(month>m1)
            {
               m1=month;
               d1=day;
            }
            else if(month==m1)
            {
                if(day>d1)
                {
                    d1=day;
                }
            }
        }

        //check if a year is lowest
        if(year<y2)
        {
            y2=year;
            m2=month;
            d2=day;
        }
        else if(year==y2)
        {
            if(month,m1)
            {
               m2=month;
               d2=day;
            }
            else if(month==m1)
            {
                if(day<d1)
                {
                    d1=day;
                }
            }
        }
    }

}