C++ Program - Find Largest Number among three Numbers


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Three numbers $$x$$, $$y$$ and $$z$$ are given and the largest number among these three numbers can be found out using below methods.

Example: Using If statement

In the below example, only if conditional statements are used.

#include <iostream>
using namespace std;

static void largest(int, int, int);

static void largest(int x, int y, int z) {
  int max = x;
  if (x >= y && x >= z)
    {max = x;}
  if (y >= x && y >= z)
    {max = y;}
  if (z >= x && z >= y)
    {max = z;}
  cout<<"largest number among "<<x<<", "<<y<<" and "<<z<<" is: "<<max<<"\n";
}

int main() {
  largest(100, 50, 25);
  largest(50, 50, 25);
  return 0;
}

Output

largest number among 100 , 50 and 25 is:  100
largest number among 50 , 50 and 25 is:  50

Example: Using If-else statement

It can also be solved using If-else conditional statements.

#include <iostream>
using namespace std;

static void largest(int, int, int);

static void largest(int x, int y, int z) {
  int max = x;
  if (x >= y && x >= z)
    {max = x;}
  else if (y >= x && y >= z)
    {max = y;}
  else 
    {max = z;}
  cout<<"largest number among "<<x<<", "<<y<<" and "<<z<<" is: "<<max<<"\n";
}

int main() {
  largest(100, 50, 25);
  largest(50, 50, 25);
  return 0;
}

Output

largest number among 100 , 50 and 25 is:  100
largest number among 50 , 50 and 25 is:  50

Example: Using Nested If-else statement

The above problem can also be solved using nested if-else conditional statements.

#include <iostream>
using namespace std;

static void largest(int, int, int);

static void largest(int x, int y, int z) {
  int max = x;
  if (x >= y)
    {
      if(x >= z) 
        {max = x;}
      else
        {max = z;}
    }
  else
    {
      if(y >= z) 
        {max = y;}
      else
        {max = z;}
    }
  cout<<"largest number among "<<x<<", "<<y<<" and "<<z<<" is: "<<max<<"\n";
}

int main() {
  largest(100, 50, 25);
  largest(50, 50, 25);
  return 0;
}

Output

largest number among 100 , 50 and 25 is:  100
largest number among 50 , 50 and 25 is:  50

Example: Using ternary operator

The ternary operator can also be used here.

#include <iostream>
using namespace std;

static void largest(int, int, int);

static void largest(int x, int y, int z) {
  int max = x;
  max = (x > y)? ((x > z)? x : z) : ((y > z)? y : z);
  cout<<"largest number among "<<x<<", "<<y<<" and "<<z<<" is: "<<max<<"\n";
}

int main() {
  largest(100, 50, 25);
  largest(50, 50, 25);
  return 0;
}

Output

largest number among 100 , 50 and 25 is:  100
largest number among 50 , 50 and 25 is:  50



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