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Check whether triangle is valid or not if sides are given

Last Updated : 20 Feb, 2023
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Given three sides, check whether triangle is valid or not. 
Examples: 
 

Input :  a = 7, b = 10, c = 5 
Output : Valid

Input : a = 1 b = 10 c = 12 
Output : Invalid

 

Approach: A triangle is valid if sum of its two sides is greater than the third side. If three sides are a, b and c, then three conditions should be met. 
 

1.a + b > c 
2.a + c > b 
3.b + c > a  

 

Check whether triangle is valid or not if sides are given

 

C++




// C++ program to check if three sides form a triangle or not
#include <bits/stdc++.h>
using namespace std;
  
// function to check if three sider form a triangle or not
bool checkValidity(int a, int b, int c)
{
    // check condition
    if (a + b <= c || a + c <= b || b + c <= a)
        return false;
    else
        return true;
}
  
// Driver function
int main()
{
    int a = 7, b = 10, c = 5;
    if (checkValidity(a, b, c))
        cout << "Valid";
    else
        cout << "Invalid";
}
  
// This code is contributed by Aditya Kumar (adityakumar129)


C




// C program to check if three sides form a triangle or not
#include <stdio.h>
#include <stdbool.h>
  
// function to check if three sider form a triangle or not
bool checkValidity(int a, int b, int c)
{
    // check condition
    if (a + b <= c || a + c <= b || b + c <= a)
        return false;
    return true;
}
  
// Driver function
void main()
{
    int a = 7, b = 10, c = 5;
    if (checkValidity(a, b, c))
        printf("Valid");
    else
        printf("Invalid");
}
  
// This code is contributed by Aditya Kumar (adityakumar129)


Java




// Java program to check validity of any triangle
  
public class GFG {
    // Function to calculate for validity
    public static int checkValidity(int a, int b, int c)
    {
        // check condition
        if (a + b <= c || a + c <= b || b + c <= a)
            return 0;
        else
            return 1;
    }
  
    // Driver function
    public static void main(String args[])
    {
        int a = 7, b = 10, c = 5;
        // function calling and print output
        if ((checkValidity(a, b, c)) == 1)
            System.out.print("Valid");
        else
            System.out.print("Invalid");
    }
}
  
// This code is contributed by Aditya Kumar (adityakumar129)


Python3




# Python3 program to check if three
# sides form a  triangle or not 
  
# function to check if three sides 
# form a triangle or not 
def checkValidity(a, b, c): 
      
    # check condition 
    if (a + b <= c) or (a + c <= b) or (b + c <= a) :
        return False
    else:
        return True        
  
# driver code 
a = 7
b = 10
c = 5
if checkValidity(a, b, c):
    print("Valid"
else:
    print("Invalid")


C#




// C# program to check 
// validity of any triangle
using System;
  
class GFG {
      
    // Function to calculate for validity
    public static int checkValidity(int a, int b, 
                                    int c)
    {
          
        // check condition
        if (a + b <= c || a + c <= b || 
                            b + c <= a)
            return 0;
        else
            return 1;
    }
  
    // Driver code
    public static void Main()
    {
        int a = 7, b = 10, c = 5;
      
        // function calling and print output
        if ((checkValidity(a, b, c)) == 1)
          Console.Write("Valid");
        else
          Console.Write("Invalid");
          
    }
}
  
// This code is contributed by Nitin Mittal.


PHP




<?php
// PHP program to check if three
// sides form a triangle or not
  
// function to check if three sider
// form a triangle or not
function checkValidity($a, $b, $c)
{
      
    // check condition
    if ($a + $b <= $c ||
        $a + $c <= $b || 
        $b + $c <= $a)
        return false;
    else
        return true;
}
  
    // Driver Code
    $a = 7; 
    $b = 10;
    $c = 5;
      
    if (checkValidity($a, $b, $c))
        echo "Valid";
    else
        echo "Invalid";
          
// This code is contributed by nitin mittal.
?>


Javascript




<script>
  
// Javascript program to check if three 
// sides form a triangle or not 
  
// function to check if three sider 
// form a triangle or not 
function checkValidity(a, b, c) 
    // check condition 
    if (a + b <= c || a + c <= b || b + c <= a) 
        return false
    else
        return true
  
// Driver function 
   
    let a = 7, b = 10, c = 5; 
      
    if (checkValidity(a, b, c)) 
        document.write("Valid"); 
    else
        document.write("Invalid");     
  
// This code is contributed by Mayank Tyagi
  
</script>


Output

Valid

Time Complexity: O(1)
Auxiliary Space: O(1)



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