Area of Triangle using Hero's Formula in C

#include <stdio.h>
#include <conio.h>

float a, b, c, s, area;
printf(" Enter three sides of a triangle: ");
scanf("%f %f %f", &a, &b, &c);


if (a==0 || b==0 || c==0)
printf(" Value of any side should not be equal to zero ");
goto back;


if (a+b<c || b+c<a || c+a<b)

printf(" Sum of two sides should not be less than third ");
goto back;


s = (a + b + c) / 2;
area = sqrt(s * (s - a) * (s - b) * (s - c));
printf(" Area of triangle: %.2f", area);




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