Article

Programming

by Md. Rakibul Karim Rabbi

Expressions

An expression is a formula in which operands are linked to each other by the use of operators to compute a

value. An operand can be a function reference, a variable, an array element or a constant.

There are four types of expressions exist in C:

• Arithmetic expressions

• Relational expressions

• Logical expressions

• Conditional expressions

1.1 Example 1: Working of post-increment and pre-increment operator

Increment operators are used to increase the value by one while decrement works opposite increment. Decrement

operator decrease the value by one.

Pre-increment (++i) - Before assigning the value to the variable, the value is incremented by one.

Post-increment (i++) - After assigning the value to the variable, the value is incremented.

The following is the syntax of pre and post increment.

+ + variable_name; ==P re ? increment

variable_name + +; ==P ost ? increment

Code:

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Output:

1.2 Example 2: Write C Program to solve simple Arithmetic Operators

Algorithm 1 Steps in pseudo code:

1: Step1: Start

2: step2: assign value in variable a, assign value in variable b and declare variable c

3: step3: Calculate c (c = a + b)

4: step4: Display result of addition, value of c on the monitor with the message "a+b = "

5: step5: Calculate c (c = a - b)

6: step6: Display result of subtraction, value of c on the monitor with the message "a-b = "

7: step7: Calculate c (c = a * b)

8: step8: Display result of multiplication, value of c on the monitor with the message "a*b = "

9: step9: Calculate c (c = a / b)

10: step10: Display result of division, value of c on the monitor with the message "a/b = "

11: step11: Calculate c (c = a % b)

12: step12: Display result of modulo-division , value of c on the monitor with the message "Remainder when a

divided by b = "

13: step13: end

Code:

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Output:

1.3 Example 3: Write C Program to find the Volume of a Cylinder(take input

from user).

Algorithm 2 Steps in pseudo code:

1: Step1: Start

2: step2: declare float variable vol, r and h

3: step3: Display a message on the monitor "enter radius: "

4: step4: read r

5: step5: Display a message on the monitor "enter height: "

6: step6: read h

7: step7: Calculate vol (vol =(22*r*r*h)/7)

8: step8: Display result of Volume of a Cylinder, value of vol on the monitor with the message "VOC: "

9: step9: end

Code:

Output:

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2 Discussion & Conclusion

Based on the focused objective(s) to understand about different types of expressions in C program, the additional

lab exercise made me more confident towards the fulfilment of the objectives(s).

3 Lab Task (Please implement yourself and show the output to the

instructor)

1. Write a C program to enter two numbers and perform all arithmetic operations.

2. Write a C Program to Calculate Area and Circumference of Circle.

3. Write a C program to enter length in centimeter and convert it into meter and kilometer.

4. Write a C Program to Calculate Area of a Rectangle, take height and width as user input.

4 Lab Exercise (Submit as a report)

1. Write a C Program to Calculate Area of a Square, take length of one side as user input.

2. Write a C program to enter temperature in °Celsius and convert it into °Fahrenheit.

3. Write a C program to enter temperature in Fahrenheit(°F) and convert it into Celsius(°C).

4. Write a C program to enter marks of five subjects and calculate total and average marks.

5 Policy

Copying from internet, classmate, seniors, or from any other source is strongly prohibited. 100% marks will be

deducted if any such copying is detected.

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