This lab report describes three programming tasks completed by the student using C language and switch statements: 1. A program that prints different cases using a switch statement and a char variable. 2. A program that calculates the roots of a quadratic equation using nested switch statements to handle different cases based on the discriminant. 3. A program that calculates the area of a triangle, square, or circle depending on user input, using a switch statement. Screenshots are provided of the code and output for each task. The report concludes with a final screenshot showing an invalid input case.

1. Lab Report # - 06
EE-112L - Programming Fundamentals Lab
By
Ausaf Ahmad
Section: A
Reg. # 20MDELE136
Class No.: 18
Instructor
Engr. Jawad Ali
Lecturer
Department of Electrical Engineering,
University of Engineering and Technology
Mardan
DATED: 02/05/2021

2. Task1: Write a C program to perform a desiredarithmetic operationusing
switchstatement and declaring choice as char data type.
Code:
#include <stdio.h>
int main()
{
char ch='b';
switch (ch)
{
case 'd':
printf("CaseD ");
break;
case 'b':
printf("CaseB");
break;
case 'c':
printf("CaseC");
break;
case 'z':
printf("CaseZ ");
break;
default:
printf("Default ");
}
}

3. Belowis the snap of Task 1 (i.e. Code for Task-1)
Task-1 Snap-A

4. Result:
Task-1 Snap-B (With Result)
Task2: Write a C program to find roots of a quadratic equation
using switch.
Code:
#include <stdio.h>
#include <math.h> /* Usedfor sqrt() */

5. int main()
{
float a, b, c;
float root1, root2, imaginary;
float discriminant;
printf("Entervaluesof a, b, c of quadratic equation(aX^2 + bX + c): ");
scanf("%f%f%f",&a,&b,&c);
/* Calculate discriminant */
discriminant= (b * b) - (4 * a * c);
/* Compute roots ofquadratic equationbased on the nature of discriminant*/
switch(discriminant> 0)
{
case 1:
/* If discriminantis positive */
root1 = (-b + sqrt(discriminant)) / (2 * a);
root2 = (-b - sqrt(discriminant)) / (2 * a);
printf("Twodistinctand real roots exists:%.2f and %.2f",
root1, root2);
break;
case 0:
/* If discriminantis not positive */
switch(discriminant< 0)
{
case 1:
/* If discriminantis negative */
root1 = root2 = -b / (2 * a);
imaginary = sqrt(-discriminant) /(2 * a);
printf("Twodistinctcomplexroots exists:%.2f + i%.2f and %.2f - i%.2f",
root1, imaginary, root2, imaginary);
break;
case 0:
/* If discriminantis zero */
root1 = root2 = -b / (2 * a);

6. printf("Twoequal and real roots exists:%.2f and %.2f",root1, root2);
break;
}
}
return 0;
}
Task-2 Snap-A (Code for root of quadratic equation)

7. Result:
Task-2 Snap-B (With Result)
Task3: Write a C program to find area of a triangle/square/circle
using switch statement.
Code:
#include<stdio.h>
#include<math.h>
main(){
int choice;
printf("Entern1 to find area of Trianglen2 for finding area of Squaren3 for finding area of
Circlen ");
scanf("%d",&choice);

8. switch(choice) {
case 1: {
int a,b,c;
float s,area;
printf("Enter sides of trianglen");
scanf("%d%d %d",&a,&b,&c);
s=(float)(a+b+c)/2;
area=(float)(sqrt(s*(s-a)*(s-b)*(s-c)));
printf("Area of Triangle is %fn",area);
break;
}
case 2: {
float side,area;
printf("Enter Sides of Squaren");
scanf("%f",&side);
area=(float)side*side;
printf("Area of Square is %fn",area);
break;
}
case 3: {
float radius,area;
printf("Enter Radius of Circlen");
scanf("%f",&radius);
area=(float)3.14159*radius*radius;
printf("Area of Circle %fn",area);
break;
}
default: {
printf("Invalid Choicen");

9. break;
}
}
}
Task3 Snap-A (Code for finding area of a triangle/square/circle)
Result:

10. Task-3 Snap-A (Result of area of Triangle)
Task-3 Snap-B (Result of area of square)

11. Task-3 Snap-C (Result of Area of Circle)
Final Snap (Invalid Case)
*****THE END*****