Program to find the 2's complement of a binary number.

#include<iostream>
#include<string.h>
using namespace std;
int main()
{
char a[10],b[10],c;
int i,count=0;
cout<<"Enter the binary number : ";
gets(a);
strcpy(b,a);
for(i=0;i<10;i++)
{
if(a[i]=='1')
{
a[i]='0';
count++;
}
else if(a[i]=='0')
{
a[i]='1';
count++;
}
}
i=count-1;
c='1';
do
{
if(a[i]=='1')
{
a[i]='0';
c='1';
}
else if(a[i]=='0')
{
a[i]='1';
c='0';
}
i--;
}while(c=='1');
cout<<"The 2's Compliment of "<<b;
cout<<" is:"<<a<<endl;
cout<<"/*\nName-Sanjampreet Singh\nRoll Number-1507967\n*/";
return 0;
}

Output: