C Operators

Question 11

C

#include<stdio.h> 
int main(void) 
{ 
  int a = 1; 
  int b = 0; 
  b = a++ + a++; 
  printf(\"%d %d\",a,b); 
  return 0; 
}

• 3 6

• Compiler Dependent

• 3 4

• 3 3

Question 12

Predict the output of following program. Assume that the characters are represented using ASCII Values.

C

#include <stdio.h>
#define VAL 32
 
int main()
{
    char arr[] = \"geeksquiz\";
    *(arr + 0) &= ~VAL;
    *(arr + 5) &= ~VAL;
    printf(\"%s\", arr);
    
    return 0;
}

• GeeksQuiz
• geeksQuiz
• Geeksquiz
• geeksquiz
• Garbage eeks Garbage uiz

Question 13

Predict the output of the below program:

C

#include <stdio.h>
int main()
{
    printf(\"%d\", 1 << 2 + 3 << 4);
    return 0;
}

• 112
• 52
• 512
• 0

Question 14

Which of the following can have different meaning in different contexts?

• &
• *
• Both of the above
• There are no such operators in C

Question 15

In C, two integers can be swapped using minimum

• 0 extra variable
• 1 extra variable
• 2 extra variable
• 4 extra variable

Question 16

What does the following statement do?

C

 x  = x | 1 << n;

• Sets x as 2ⁿ
• Sets (n+1)th bit of x
• Toggles (n+1)th bit of x
• Unsets (n+1)th bit of x

Question 17

Predict the output of following C program 

C

#include <stdio.h>
int main()
{
    int i = 0;
    do
    {
        printf(\"GeeqsQuiz \");
        i = i++;
    }
    while (i < 5);
    return 0;
}

• GeeqsQuiz GeeqsQuiz GeeqsQuiz GeeqsQuiz GeeqsQuiz

• Infinite time GeeksQuiz

• Undefined Behavior

• None of the above

Question 18

Assume that the size of an integer is 4 bytes, predict the output of following program.

C

#include <stdio.h>
int main()
{
    int i = 12;
    int j = sizeof(i++);
    printf(\"%d  %d\", i, j);
    return 0;
}

• 12 4
• 13 4
• Compiler Error
• 0 4

Question 19

C

#include<stdio.h>
int main()
{
  int a = 2,b = 5;
  a = a^b;
  b = b^a;
  printf(\"%d %d\",a,b);
  return 0;
}

• 5 2
• 2 5
• 7 7
• 7 2

Question 20

Predict the output of following program? 

C

#include <stdio.h>

int main() {
    int x = 10;
    int y = 20;
    x += (y += 10);
    printf("%d %d", x, y);
    return 0;
}

• 40 20

• 40 30

• 30 30

• 30 40