C Control Instructions Questions with Answers | Page 2

In C programming, control instructions define the flow of execution using decision-making, looping, and branching statements. Commonly tested in programming questions and answers, this concept evaluates a candidate’s logical thinking and problem-solving skills. Companies like TCS, Wipro, and Infosys often include C control instruction questions with answers in their online assessments and interviews. By mastering conditional statements (if-else, switch), loops (for, while, do-while), and jump statements, programmers can write optimized code. This section provides solved C programming MCQs and explanations to help you understand control flow deeply and perform better in technical placement rounds.

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Q11

How many times will this loop execute: while(0){ printf("Hello"); }

A 0 times
B 1 time
C Infinite times
D 2 times

Answer: Option A

Explanation: While(0) means false condition, so loop never executes.

Q12

What is the purpose of switch statement in C?

A To declare variables
B To perform mathematical operations
C To handle multiple conditions efficiently
D To define arrays

Answer: Option C

Explanation: Switch provides multi-way branching based on different cases.

Q13

Which is mandatory in a switch statement?

A default case
B break statement
C case values
D All are mandatory

Answer: Option C

Explanation: Default case is optional, break is optional, but case values are mandatory for functionality.

Q14

What happens if break is omitted in a switch case?

A Compiler error
B Execution stops
C Falls through to next case
D Jumps to default case

Answer: Option C

Explanation: Without break, execution falls through to the next case.

Q15

Which operator has highest precedence in condition checks?

A Logical AND (&&)
B Logical OR (||)
C Logical NOT (!)
D All have same precedence

Answer: Option C

Explanation: Logical NOT has higher precedence than AND and OR operators.

Q16

What is the result of: if(5) printf("True"); else printf("False");

A True
B False
C Compilation error
D Runtime error

Answer: Option A

Explanation: Non-zero values are considered true in C conditions.

Q17

Which is not a jump statement in C?

A break
B continue
C goto
D return

Answer: Option D

Explanation: Return is used for functions, not specifically for jumping within control structures.

Q18

What is goto statement used for?

A To call functions
B To declare variables
C For unconditional jumping within function
D To terminate programs

Answer: Option C

Explanation: Goto provides unconditional jump to a labeled statement in the same function.

Q19

Which loop is best when number of iterations is known?

A while loop
B do-while loop
C for loop
D All are equally good

Answer: Option C

Explanation: For loop is ideal when iteration count is known beforehand.

Q20

What does while(1) represent?

A Loop that runs once
B Infinite loop
C Loop that never runs
D Conditional loop

Answer: Option B

Explanation: While(1) creates an infinite loop as condition is always true.

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