# Herons formula

The task is as follows: Enter the lengths of the triangles a, b, and c. If three sides do not form a triangle, repeat the procedure (page entry, etc.), otherwise calculate using Heron formula the area of a triangle and print it to one decimal place. My code seems so work fine, except the part where it should repeat the procedure if inputs do not form a triangle, instead it outputs 0 or nan. Not sure if its the problem in do-while loop or something else. #include <iostream> #include <math.h> #include <string.h> using namespace std; float heron (float, float, float); void triangle(){ float a, b, c; do { cin >> a; cin >> b; cin >> c; } while ((a+b<c) && (a+c<b) && (b+c<a)); ; cout << ceil((heron(a, b, c)*10))/10 << endl; } int main(){ triangle(); } float heron (float a, float b, float c){ float s=(a+b+c)/2; return sqrt(s*(s-a)*(s-b)*(s-c)); }