C Programming Conditional Statements

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Questions and Answers

What is the purpose of using curly braces in an if-else statement?

To group multiple statements together (correct)
To increase the execution speed of the code
To separate the if and else blocks
To decrease the readability of the code

What is the syntax for a conditional operator in C?

condition ? statement1 : statement2 (correct)
condition ? (statement1, statement2)
if (condition) { statement1 } else { statement2 }
if (condition) statement1 else statement2

What is the purpose of the 'if-else' statement in a program?

To make decisions based on conditions (correct)
To skip a block of code
To repeat a block of code
To declare variables

What type of control structure is used to execute one code block out of many alternatives?

Selection control structure (C) Signup and view all the answers

What is the purpose of the 'switch' statement in C?

To make decisions based on multiple conditions (A) Signup and view all the answers

What is the term for a statement that transfers control to another part of the program?

Jump statement (D) Signup and view all the answers

What is an example of a multiple-selection statement?

Switch-case statement (A) Signup and view all the answers

What is the purpose of the 'nested if' statement?

To make decisions based on multiple conditions (B) Signup and view all the answers

What is the flowchart symbol for a decision?

Diamond (B) Signup and view all the answers

What is the condition for printing 'Pass' in the program?

If the average is greater than or equal to 50. (D) Signup and view all the answers

What is the purpose of the `scanf` function in the program?

To read input from the user. (D) Signup and view all the answers

What is the role of the `if` statement in the program?

To determine whether a student is passing or failing. (B) Signup and view all the answers

What is the control flow statement used in the program?

If-else statement (A) Signup and view all the answers

What is the purpose of the `printf` function in the program?

To display a message to the user. (C) Signup and view all the answers

What is the condition for printing 'Fail' in the program?

If the average is less than 50. (C) Signup and view all the answers

What is the purpose of the selection control structure?

To choose a path from multiple options (C) Signup and view all the answers

What is the difference between single-selection statements and double-selection statements?

Single-selection statements have one path, while double-selection statements have two paths (A) Signup and view all the answers

What is the purpose of the conditional operator?

To evaluate a condition and return one of two values (D) Signup and view all the answers

What is an example of a multiple selection statement?

A switch-case statement (B) Signup and view all the answers

What is the purpose of a compound statement?

To group a set of statements together (C) Signup and view all the answers

What is the advantage of using a switch-case statement?

It allows for multiple cases to be handled (C) Signup and view all the answers

What is the purpose of the if-else statement?

To handle multiple conditions and execute different blocks of code (C) Signup and view all the answers

What is the benefit of using nested if statements?

It allows for more complex decisions to be made (A) Signup and view all the answers

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Study Notes

Control Structures

Control structures are used to control the flow of a program's execution
There are three types of control structures: Sequence, Selection, and Repetition

Selection Control Structure

Selection control structure is used to make decisions in a program
It allows the program to choose between different paths based on a condition
Types of selection statements: If..Then, If..Else, and Switch..Case

If..Then Statement

If..Then statement is a single-selection statement
It executes a block of code if a certain condition is true
Syntax: if (condition) { code to be executed }

If..Else Statement

If..Else statement is a double-selection statement
It executes a block of code if a certain condition is true, and another block of code if the condition is false
Syntax: if (condition) { code to be executed if true } else { code to be executed if false }

Conditional Operator

Conditional operator is a ternary operator that evaluates a condition and executes one of two blocks of code
Syntax: condition ? code to be executed if true : code to be executed if false

Example 1: Determine Final Grade

Program to determine a student's final grade based on the average of four marks
If the average is 50 or more, the program prints "Pass", otherwise it prints "Fail"
Pseudocode:
- Step 1: Input four marks
- Step 2: Calculate the average
- Step 3: If average is below 50, print "Fail", else print "Pass"

Example 2: Calculate the Power of two numbers

Program to calculate the power of two numbers, x and y
The program prompts the user to input two numbers, then displays "x to the power of y"
Pseudocode:
- Step 1: Input two numbers x and y
- Step 2: Calculate the power xy
- Step 3: Print the power