a program of substraction

[Jenny]

/*I made this program to do substraction between two integers
whose digits are beyond the limit of a long int on my system
but the program can only execute within 10 digits.What's more only
under the condition "i>j"and "i==j"does the program work
successfully..W hy?Can you help me?
Thanks a lot */

#include<stdio. h>
#include<stdlib .h>
int remainder[21],remainder1[21],remainder2[21];


int main()
{
long integer1,intege r2;
int i,j,n;


scanf("%ld%ld", &integer1,&inte ger2);

for(n=1;n<=20;n ++){
remainder1[n] = integer1 % 10;
integer1 = (integer1 - remainder1[n]) / 10;


remainder2[n] = integer2 % 10;
integer2 = (integer2 - remainder2[n]) / 10;
}

for(i=20;remain der1[i] == 0;)
i--;

for(j=20;remain der1[j] == 0;)
j--;

if(i>j){
for(n=0;n<=20;n ++){
if(remainder1[n]<remainder2[n]){
remainder1[n]+=10;
remainder1[n+1]-=1;
}/*end if*/
remainder[n]=remainder1[n]-remainder2[n];
}/*end for*/

for(;i>=1;i--)
printf("%d",rem ainder[i]);
}/*end if*/

if(i==j){
for(;remainder1[i]==remainder2[i];)
i--;
if(remainder1[i]>remainder2[i]){
for(n=0;n<=20;n ++){
if(remainder1[n]<remainder2[n]){
remainder1[n]+=10;
remainder1[n+1]-=1;
}/*end if*/
remainder[n]=remainder1[n]-remainder2[n];
}/*end for*/
for(;remainder[i]==0;)
i--;

for(;i>=1;i--)
printf("%d",rem ainder[i]);
}/*end if*/

if(remainder2[i]>remainder1[i]){
for(n=0;n<=20;n ++){
if(remainder2[n]<remainder1[n]){
remainder2[n]+=10;
remainder2[n+1]-=1;
}/*end if*/
remainder[n]=remainder2[n]-remainder1[n];
}/*end for*/
for(;remainder[i]==0;)
i--;

printf("-");

for(;i>=1;i--)
printf("%d",rem ainder[i]);
}/*end if*/
}/*end if*/


if(j>i){
for(n=0;n<=20;n ++){
if(remainder2[n]<remainder1[n]){
remainder2[n]+=10;
remainder2[n+1]-=1;
}/*end if*/
remainder[n]=remainder2[n]-remainder1[n];
}/*end for*/

for(;j>=1;j--)
printf("%d",rem ainder[j]);
}/*end if*/

return 0;
}

[Richard Heathfield]

Re: a program of substraction

Jenny said:

/*I made this program to do substraction between two integers

Yeah, it has the same problem as your addition program.

See my reply re your addition question in acllcc++.

If you must post the same article to more than one group (rarely a good
idea), cross-post rather than multi-post.

--
Richard Heathfield <http://www.cpax.org.uk >
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999