C Programming

What does this code print?

char str[] = "World";

str[2] = 'r';

printf("%s", str);

• World

• Wrrld

• Worrd

• Worrld

What happens here?

char str[] = "Hi";

str[2] = '!';

printf("%s", str);

• Hi

• Hi!

• H!i

• Undefined` or garbage value

Answer explanation

you're overwriting the null terminator — risky behavior!

`What does this function compute?

int fun(int n) {

if (n == 0) return 0;

return n + fun(n - 1);

}

• Multiplication Table

• Sum of n natural number

• Factorial

• Fibonacci

What does this function do?

void fun(int n) {

if (n == 0) return;

fun(n - 1);

printf("%d ", n);

}

• Prints numbers in reverse

• Prints from 1 to n

• Infinite loop

• Compilation error

Answer explanation

Recursion goes down to 0, then prints as it comes back

What does this loop do?

for (int i = 1; i <= 3; i++) {

printf("Loop\n");

}

• Prints “Loop” 1 time

• Prints “Loop” 3 times

• Infinite loop

• Error

What will this pattern print?

for (int i = 1; i <= 3; i++) {

for (int j = 1; j <= i; j++) {

printf("*");

}

printf("\n");

}

• *** **

  *

• *

  **

  ***

• 1

  2

  3

• ***

  ***

  ***

What does this pattern print?

for (int i = 1; i <= 3; i++) {

for (int j = 1; j <= 3; j++) {

printf("%d", j);

}

printf("\n");

}

• 123

  123

  123

• 111

  222

  333

• 321

  321

  321

• 123

  234

  345

What is the output?

int i = 1;

while(i < 4) {

printf("Hi ");

i++;

}

• Hi Hi

• Hi Hi Hi

• infinite Hi

• Error

What does this code do?

int sum = 0;

for(int i = 1; i <= 3; i++) {

sum = sum + i;

}

printf("%d", sum);

• 3

• 6

• 7

• 9

What will this code print?

int i = 0;

while(i++ < 3) {

printf("%d ", i);

}

• 1 2 3

• 0 1 2

• 1 2 3 4

• 2 3 4

Answer explanation

i++ increments after the condition is checked. So i goes from 1 to 4 inside loop body.