In this program, you will take input of three sides from the user and you will check whether the triangle is valid or not if sides are given, if the sum of any two sides is greater than the third side then a triangle is valid
#include <stdio.h>
int main()
{
int side1,side2,side3;
printf("\n enter three side of triangle:");
scanf("%d %d %d",&side1,&side2,&side3);
if((side1+side2>side3)&&(side1+side3>side2)&&(side2+side3>side1))
{
printf("tringle is valid");
}
else
{
printf("triangle is not valid");
}
return 0;
}enter three side of triangle:3 5 7 triangle is valid
input three triangle side from the user and check if sum of all the two side is greater than third side than triangle is valid
side1+side2>side3
side2+side3>side1
side1+side3>side2
if all these condition satisfy than triangle is valid