C++ Exercises: Find two's complement of a binary number
C++ For Loop: Exercise-65 with Solution
Write a program in C++ to find the two's complement of a binary number.
Sample Solution:-
C++ Code :
#include <iostream>
#define SZ 8
using namespace std;
int main()
{
char bn[SZ + 1], onComp[SZ + 1], twComp[SZ + 1];
int i, carr = 1;
int er = 0;
cout << "\n\n Find two's complement of a binary value:\n";
cout << "----------------------------------------------\n";
cout << " Input a " << SZ << " bit binary value: ";
cin >> bn;
for (i = 0; i < SZ; i++)
{
if (bn[i] == '1')
{
onComp[i] = '0';
}
else if (bn[i] == '0')
{
onComp[i] = '1';
}
else
{
cout << "Invalid Input. Input the value of assign bits." << endl;
er = 1;
break;
}
}
onComp[SZ] = '\0';
for (i = SZ - 1; i >= 0; i--)
{
if (onComp[i] == '1' && carr == 1)
{
twComp[i] = '0';
}
else if (onComp[i] == '0' && carr == 1)
{
twComp[i] = '1';
carr = 0;
}
else
{
twComp[i] = onComp[i];
}
}
twComp[SZ] = '\0';
if (er == 0)
{
cout << " The original binary = " << bn << endl;
cout << " After ones complement the value = " << onComp << endl;
cout << " After twos complement the value = " << twComp << endl;
}
}
Sample Output:
Find two's complement of a binary value: ---------------------------------------------- Input a 8 bit binary value: 01101110 The original binary = 01101110 After ones complement the value = 10010001 After twos complement the value = 10010010
Flowchart:

C++ Code Editor:
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Previous: Write a program in C++ to find one's complement of a binary number.
Next: Write code to create a checkerboard pattern with the words "black" and "white".
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