#include<iostream.h>
#include<stdio.h>
#include<string.h>
char tmp1[100], tmp2[100], tmpans[200];
char op1[100], op2[100], ans[200];
int len1, len2, len3, sign1, sign2, sign3;
void removeblank(char*);
void reverse(char x[]);
void printans(), add(), sub(), mul(), div();
int main(){
    printf("First #:");
    gets(tmp1);
    printf("Second#:");
    gets(tmp2);
    removeblank(tmp1);
    removeblank(tmp2);
    strcpy(op1, tmp1);
    strcpy(op2, tmp2);
    len1=strlen(op1);
    len2=strlen(op2);
    reverse(op1); reverse(op2);
    //printf("op1=%s\n", op1);
    //printf("op2=%s\n", op2);

    add(); cout <<"sum===="; printans();
    sub(); cout <<"diff==="; printans();
    mul(); cout <<"mul="; printans();
    div(); cout <<"div="; printans();
}
void removeblank(char x[1])
{
}
void copy100(char t[1], char s[1])
{ int i=0;
  for(; i< 100; i++) t[i] = s[i];
}
void reverse(char x[1])
{ char tmp[100], i, k=0;
   for(i=strlen(x)-1; i>=0; i--){
      if(x[i] != '.') tmp[k++] = x[i] - '0'; 
   }
   tmp[k]=0;
   copy100(x, tmp);
}
void printans()
{  int i;
   if(sign3)cout<<"-";
   for(i=len3-1; i>0; i--) if(ans[i]!=0) break;
   while(i) cout << (int)ans[i--];
   cout << (int)ans[0] << endl;
}
void  add()
{  int cy, i, tmp, n=len1;
   if(n< len2) n=len2;
   len3 = n+1;
   cy=0;
   for(i=0; i<=n; i++){
       tmp = op1[i]+op2[i]+cy; 
       if(tmp>10) {
          cy=1; ans[i] = (tmp % 10);
       }else ans[i] =  tmp;
   }
}
void  sub()
{  int cy, i, tmp, n=len1;
   if(n< len2) n=len2;
   len3 = n;
   cy=0;
   for(i=0; i<n; i++){
       tmp = op1[i]-op2[i]-cy; 
       cy=0;
       if(tmp<0) {
          cy=1; ans[i] = -tmp ;
       }else ans[i] =  tmp;
   }
   if(cy) sign3=1;
}
void  mul()
{
}
void  div()
{
}