For storing variable-length strings dynamically in a competitive program, what's the safest approach?

The correct answer is A: Allocate strlen(s)+1 bytes to include null terminator. Strings in C are null-terminated, so allocating strlen(s)+1 bytes ensures space for the null terminator. This is the standard safe approach.

In C, what is the difference between #include and #include "stdio.h"?

The correct answer is B: searches standard directories; "" searches current directory first. Angle brackets search standard include directories, while quotes search the current directory first, then standard directories.

What will be the output of this code? int arr[5]; for(int i=0; i

The correct answer is B: 1 4 16. Array values: arr[0]=0, arr[1]=1, arr[2]=4, arr[3]=9, arr[4]=16. Output is 1 4 16.

Which statement is used to skip remaining iterations and move to next iteration?

The correct answer is B: continue. continue is the C keyword that jumps to the next iteration of the loop.

What is the difference between *p++ and (*p)++?

The correct answer is B: *p++ increments pointer, (*p)++ increments value. Due to operator precedence, *p++ is equivalent to *(p++), incrementing the pointer. (*p)++ explicitly increments the value.

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C Programming
Control Flow

C language from basics to advanced placement prep

52 Q 10 Topics Take Mock Test

Difficulty: All Easy Medium Hard 51–52 of 52

Topics in C Programming

All Basics & Syntax 86 Data Types & Variables 97 Control Flow 100 Functions 99 Arrays & Strings 100 Pointers 99 Structures & Unions 100 File Handling 100 Dynamic Memory 98 Preprocessor 99

Q.51 Medium Control Flow

What is the output?
for (int i = 1; i

A 1 2

B 1 2 3

C 1 2 3 4 5

D 2 3 4

Correct Answer: A. 1 2

EXPLANATION

When i becomes 3, break is executed, exiting the loop. So only 1 and 2 are printed.

Test

Q.52 Medium Control Flow

What will be printed?
int x = 0;
if (x = 5)
printf("True");
else
printf("False");

A True

B False

C Compilation error

D Undefined behavior

Correct Answer: A. True

EXPLANATION

x = 5 assigns 5 to x and evaluates to 5 (non-zero), which is true. So 'True' is printed.

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Control Flow