Check whether triangle is valid or not if sides are given

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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

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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