Check whether triangle is valid or not if sides are given
Last Updated :
10 Feb, 2025
Given three sides, check whether triangle is valid or not.
Examples:
Input : a = 7, b = 10, c = 5
Output : Valid
We can draw a triangle with the given three edge lengths.
Input : a = 1, b = 10, c = 12
Output : Invalid
We can not draw a triangle with the given three edge lengths.
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.
- (a + b) > c
- (a + c) > b
- (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)
{
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 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)
{
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");
}
// 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;
if ((checkValidity(a, b, c)) == 1)
System.out.print("Valid");
else
System.out.print("Invalid");
}
}
# 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# 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.
// 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)
{
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");
<?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";
?>
Time Complexity: O(1)
Auxiliary Space: O(1)
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