C program to calculate the area of a triangle

In this article we will learn to implement a C program to calculate the area of a triangle. A C program is provided below to read the three sides of triangle and display the area of the triangle as output.

//C program to calculate the area of a triangle
//Formula: area = (s(s-a)(s-b)(s-c))1/2,  where s=(a+b+c)/2. This formula is Heron's formula
#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
	float a, b, c, s, area;
	printf("Enter side a: ");
	scanf("%f", &a);
	printf("Enter side b: ");
	scanf("%f", &b);
	printf("Enter side c: ");
	scanf("%f", &c);
	s = (a+b+c)/2;
	area = sqrt(s*(s-a)*(s-b)*(s-c));
	printf("Area of the triangle is: %.3f", area);
	getch();
}

Input and output for the above program is as follows:

Enter side a: 5
Enter side b: 6
Enter side c: 8
Area of the triangle is: 14.981

Suryateja Pericherla

Suryateja Pericherla, at present is a Research Scholar (full-time Ph.D.) in the Dept. of Computer Science & Systems Engineering at Andhra University, Visakhapatnam. Previously worked as an Associate Professor in the Dept. of CSE at Vishnu Institute of Technology, India.

He has 11+ years of teaching experience and is an individual researcher whose research interests are Cloud Computing, Internet of Things, Computer Security, Network Security and Blockchain.

He is a member of professional societies like IEEE, ACM, CSI and ISCA. He published several research papers which are indexed by SCIE, WoS, Scopus, Springer and others.