Tag: perimeter

C Program To Find Area, Perimeter and Semi-perimeter: Valid Triangle

Lets ask the user to input lengths of 3 sides of the Triangle. First lets check if those 3 values form a valid Triangle. If it does, then we shall calculate perimeter, semi-perimeter and area of the Triangle. If it doesn’t form a valid Triangle, then we display that message on to the console window.

Related Read:
Find Area of a Triangle Using Its Sides: C Program

Logic To check if it’s a valid Triangle or Not

Logic to find if the user entered values for sides of Triangle actually forms a valid Triangle or not is present in our previous video tutorial. Please watch it without fail before continuing this tutorial. We’ve posted source code, video and explanation at Triangle Valid or Not based On Sides: C Program

Formula To Calculate Perimeter, Semi-perimeter and Area of a Triangle

p = (a + b + c);
sp = (a + b + c) / 2.0;
area = sqrt( sp * (sp-a) * (sp-b) * (sp-c) );

where a, b and c are lengths of sides of the Triangle.
p – perimeter
sp – Semi-perimeter.

C Program To Find Area, Perimeter and Semi-perimeter: Valid Triangle


[youtube https://www.youtube.com/watch?v=CmGb-nlSC7o]

YouTube Link: https://www.youtube.com/watch?v=CmGb-nlSC7o [Watch the Video In Full Screen.]


C Program To Find Area, Perimeter and Semi-perimeter: Valid Triangle

#include < stdio.h >
#include < math.h >

int main()
{
    float a, b, c, flag = 0, p, sp, area;

    printf("Enter values for a, b and c\n");
    scanf("%f%f%f", &a, &b, &c);

    if( a>b && a>c)
    {
        flag = ((b+c) > a);
    }
    else if( b>c )
    {
        flag = ((a+c) > b);
    }
    else
    {
        flag = ((a+b) > c);
        printf("%f\n", flag);
    }

    if(flag)
    {
        p    = a + b + c;
        sp   = p / 2.0;
        area = sqrt( sp*(sp-a)*(sp-b)*(sp-c) );

        printf("Perimeter is %f\n", p);
        printf("Semi-Perimeter is %f\n", sp);
        printf("Area of Triangle is %f\n", area);
    }
    else
    {
        printf("Invalid Triangle\n");
    }

    return 0;
}

Output 1:
Enter values for a, b and c
10
5
3
Invalid Triangle

Output 2:
Enter values for a, b and c
5
6
9
Perimeter is 20.000000
Semi-Perimeter is 10.000000
Area of Triangle is 14.142136

In above source code, variable flag stores true(1) or false(0) value.

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Perimeter of Rectangle: C Program

The length and breadth / width of a rectangle are entered through the keyboard. Write a program to calculate the perimeter of the rectangle.

To get perimeter of a rectangle, we add the length and width of rectangle and then multiply it with 2. In other words, perimeter is the addition of length of all the sides of a rectangle.

Related Read:
Basic Arithmetic Operations In C
Area of Rectangle: C Program

Note: Perimeter of a Rectangle is calculated using the formula
Perimeter = 2 * (Length + Width);


perimeter of rectangle

Length: is the length of the longest side of the rectangle.
width: is the length of the smallest side of the rectangle.

Find Perimeter of a Rectangle: C Program


[youtube https://www.youtube.com/watch?v=EnQTDhvimd0]

YouTube Link: https://www.youtube.com/watch?v=EnQTDhvimd0 [Watch the Video In Full Screen.]


Source Code: Find Perimeter of a Rectangle: C Program

#include < stdio.h >

int main()
{
    float length, width, perimeter;

    printf("Enter length of Rectangle\n");
    scanf("%f", &length);

    printf("Enter width of Rectangle\n");
    scanf("%f", &width);

    perimeter = 2 * (length + width);

    printf("Perimeter of Rectangle is %f\n", perimeter);

    return 0;
}

Output:
Enter length of Rectangle
12
Enter width of Rectangle
6
Perimeter of Rectangle is 36.000000

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For full C programming language free video tutorial list visit:C Programming: Beginner To Advance To Expert