Check that triangle is right?

Question

I'm trying to check if a triangle is a right triangle in C language. `a`, `b` and `c` are lengths of sides of some triangle. int is_right_triangle(int a, int b, int c) { return (a * a + b * b == c * c || a * a + c * c == b * b || b * b + c * c == a * a); } How I can avoid an integer overflow in sum and multiplication? Assume that we don't have a `long long` type.

Answer 1

The measures of the sides can be decimal numbers and fractions. You must use double or float.

Overflow then is not an issue.

I used macros instead of one line function...

If you shall do C++, you can make them inline functions.

=================================================================

#include <stdio.h>

#define Pythagorean(x,y,z) ( ((x)*(x))+ ((y)*(y)) == ((z)*(z)) )

#define IsRightTriangle(x,y,z) ( Pythagorean(x,y,z) || Pythagorean(x,z,y) || Pythagorean(y,z,x))

int main()

{

printf(" 3 4 5 : %d \n", IsRightTriangle(3,4,5)) ; //yes

printf(" 5 13 12 : %d \n ", IsRightTriangle(5,13,12)); //yes

printf(" 25 7 24 : %d \n",IsRightTriangle(25,7,24)); //yes

printf(" 1 4 5 : %d \n",IsRightTriangle(1,4,5)); //no

}