C++ Program to Find Greatest of Three Numbers

Here we will see the programs to find greatest of three number using different method. 

i) Program using nested if else:

#include <iostream>
using namespace std;

int main ()
{
  int a, b, c;
  cout << "Enter three numbers" << endl;
  cin >> a >> b >> c;

  if (a >= b)
    {
      if (a >= c)
	    cout << a << " is the greatest number.";

      else
	    cout << c << " is the greatest number.";
    }

  else
    {
      if (b >= c)
	    cout << b << " is the greatest number.";

      else
	    cout << c << " is the greatest number.";
    }

  return 0;
}

Output:

Enter three numbers
54
98
67
98 is the greatest number.

ii) Program using if else:

#include <iostream>
using namespace std;

int main ()
{
  int a, b, c;
  cout << "Enter three numbers" << endl;
  cin >> a >> b >> c;

  if (a >= b && a >= c)
    cout << a << " is the gratest number";

  else if (b >= a && b >= c)
    cout << b << " is the gratest number";

  else
    cout << c << " is the gratest number";

  return 0;
}

Output:

Enter three numbers
54
98
67
98 is the greatest number.

iii) Program using ternary operator:

#include <iostream>
using namespace std;

int main ()
{
  int a, b, c, max;
  cout << "Enter three numbers" << endl;
  cin >> a >> b >> c;

  max = (a > b) ? ((a > c) ? a : c) : ((b > c) ? b : c);
  cout << "Greatest number is:" << max;

  return 0;
}

Output:

Enter three numbers
54
98
67
Greatest number is:98