Answer Posted / supri

see subtraction itself is the addition of the number with
its 2's complement....
add(int a,int b)
{
if(!a)
return b;
else
return(add((a&b)<<1,a^b));
}
main()
{
int a,b;
scanf("%d%d",&a,&b);
b=add(~b,1);
printf("%d",add(a,b));
return;
}
u can try this...

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