C Exercise 3

Objective:

• Functions in C

Activity 1:

Write C program that will ask the user to enter the width and length of a rectangle and then display the rectangle’s area. The program calls the following functions, which have not been written:

• getLength: This function should ask the user to enter the rectangle’s length and then return that value as a double .
• getWidth: This function should ask the user to enter the rectangle’s width and then return that value as a double .
• getArea: This function should accept the rectangle’s length and width as arguments and return the rectangle’s area. The area is calculated by multiplying the length by the width.
• displayData: This function should accept the rectangle’s length, width, and area as arguments and display them in an appropriate message on the screen.

Solution:

#include <stdio.h>

double getLength()
{
    double length;

    printf("Enter Length of Rectangle: \n");
    scanf("%lf", &length);

    return length;
}

double getWidth()
{
    double width;

    printf("Enter Width of Rectangle: \n");
    scanf("%lf", &width);

    return width;
}

double getArea(double i, double j)
{
    double area;
    area = i * j;

    return area;
}

void displayData(double A)
{
    printf("Area of Rectangle is: %.2lf\n", A);
}

int main()
{
    double x, y, area;

    x = getLength();
    y = getWidth();

    area = getArea(x, y);
    displayData(area);

    return 0;
}

Activity 2:

Write a function called displayShape that accepts size and shapetype as parameters and displays a square or a triangle of the required size.

So e.g. if the function is called with the following parameters:

displayShape(‘S’, 5); a square of size 5 is displayed as given

1	2	3	4	5
2	4	6	8	10
3	6	9	12	15
4	8	12	16	20
5	10	15	20	25

 

displayShape(‘T’, 6); a triangle of size 6 is displayed as given

                1

             1  1

           1  2  1

         1  3  3  1

       1  4  6  4  1

   1 5  10  10  5  1 

Solution:

#include <stdio.h>

void print_square(int Size)
{
    int num, i, j, res;
    for (i = 1; i <= Size; i++)
    {
        num = i;
        for (j = 1; j <= Size; j++)
        {
            res = num * j;
            printf("%d\t", res);
        }
        printf("\n");
    }
    printf("\n");
}

void print_triangle(int Size)
{
    int coef = 1;
    for (int i = 0; i < Size; i++)
    {
        for (int space = 1; space <= Size - i; space++)
        {
            printf("  ");
        }
        for (int j = 0; j <= i; j++)
        {
            if (j == 0 || i == 0)
            {
                coef = 1;
            }
            else
            {
                coef = coef * (i - j + 1) / j;
            }
            printf("%d   ", coef);
        }
        printf("\n");
    }
}

int main()
{
    char choice2 = 'y';

    do {
        int size;
        char choice;

        printf("Enter Size of Shape: \n");
        scanf("%d", &size);
        printf("Enter s for Square-shape or t for triangle-shape: \n");
        scanf(" %c", &choice);

        if (choice == 's')
        {
            print_square(size);
        }
        if (choice == 't')
        {
            print_triangle(size);
        }

        printf("If you want to Repeat then press y. \n");
        scanf(" %c", &choice2);

    } while (choice2 == 'y');

    return 0;
}

Activity 3:

Write a program that converts a binary number into decimal number.

Solution:

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

int decimalConverter(int num)
{
    int dec = 0, i = 0, rem;
    bool possible = true;
    while (num != 0)
    {
        rem = num % 10;
        num /= 10;
        if (rem == 0 || rem == 1)
        {
            dec += rem * (int)pow(2, i);
            ++i;
        }
        else
        {
            printf("Conversion not possible: it is not a binary number.\n");
            possible = false;
            break;
        }
    }
    if (possible == true)
    {
        return dec;
    }
    return -1; // Return a negative value to indicate the conversion failed.
}

int main()
{
    int n;
    printf("Enter a Binary Number: ");
    scanf("%d", &n);
    printf("Decimal Number: %d\n", decimalConverter(n));
    return 0;
}