Area of a triangle in language C

Language

C
Description

Write a program that prompts the user to enter the tree points (x1, y1), (x2, y2), and (x3, y3) of a triangle and displays its area.
The formula for computing the area of a triangle is:
s = (side1 + side2 + side3) / 2
area = sqrt(s * (s - side1) * (s - side2) * (s - side3))

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#include <stdio.h>

#include <stdlib.h>

#include <math.h>

int main (void)

{

    float area, s, side1, side2, side3;

    float x1, x2, x3, y1, y2;

    float y3;

    printf ("Enter the value of x1: ");

    scanf ("%f", &x1);

    (void) getchar ();

    printf ("Enter the value of x2: ");

    scanf ("%f", &x2);

    (void) getchar ();

    printf ("Enter the value of x3: ");

    scanf ("%f", &x3);

    (void) getchar ();

    printf ("Enter the value of y1: ");

    scanf ("%f", &y1);

    (void) getchar ();

    printf ("Enter the value of y2: ");

    scanf ("%f", &y2);

    (void) getchar ();

    printf ("Enter the value of y3: ");

    scanf ("%f", &y3);

    (void) getchar ();

    side1=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));

    side2=sqrt((x2-x3)*(x2-x3)+(y2-y3)*(y2-y3));

    side3=sqrt((x3-x1)*(x3-x1)+(y3-y1)*(y3-y1));

    s=(side1+side2+side3)/2;

    area=sqrt(s*(s-side1)*(s-side2)*(s-side3));

    printf ("Value of area: %g\n", area);

    printf ("Value of s: %g\n", s);

    printf ("Value of side1: %g\n", side1);

    printf ("Value of side2: %g\n", side2);

    printf ("Value of side3: %g\n", side3);

    putchar ('\n');

    system ("pause");

    return EXIT_SUCCESS;

}