# spoj question http://www.spoj.com/problems/JULKA/

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

``````       #define MAX 111

char klaudia[MAX], natalia[MAX], total[MAX], diff[MAX];

void calc()
{
int len1 = strlen(total);
int len2 = strlen(diff);
int a, b, c, i, j, k, f;
char temp[MAX];

for(i=len1-1, j=len2-1, k=c=0; i>=0 || j>=0 || c; i--, j--, k++)
{
a = i>=0? total[i]-'0' : 0;
b = j>=0? diff[j]-'0' : 0;
temp[k] = (a+b+c)%10 + '0';
c = (a+b+c)/10;
}
temp[k] = 0;

strcpy(klaudia,"0");
//expalin the for loop what is actually being done here//
for(i=k-1, j=a=f=0; i>=0; i--)
{
b = (a*10 + temp[i]-'0') / 2;
a = (a*10 + temp[i]-'0') % 2;
if(b) f = 1;
if(f) klaudia[j++] = b+'0';
}
if(!j) j++;
klaudia[j] = 0;

for(i=len1-1, j=len2-1, k=c=0; i>=0; i--, j--, k++)
{
a = total[i]-'0';
b = j>=0? diff[j]-'0' : 0;
if(a < b+c)
{
temp[k] = (10+a-b-c) + '0';
c = 1;
}
else
{
temp[k] = a-b-c + '0';
c = 0;
}
}
temp[k] = 0;

strcpy(natalia,"0");
for(i=k-1, j=a=f=0; i>=0; i--)
{
b = (a*10 + temp[i]-'0') / 2;
a = (a*10 + temp[i]-'0') % 2;
if(b) f = 1;
if(f) natalia[j++] = b+'0';
}
if(!j) j++;
natalia[j] = 0;
``````

}

``````   int main()
{
while(scanf("%s %s", total, diff)==2)
{
calc();
printf("%s\n%s\n", klaudia, natalia);
}

return 0;
``````

}
expalin the for loop what is actually being done there