C Loops & Control Structure

Question 1

C

#include <stdio.h>

int main()
{
    int i = 1024;
    for (; i; i >>= 1)
        printf(\"GeeksQuiz\");
    return 0;
}

How many times will GeeksQuiz be printed in the above program?

• 10
• 11
• Infinite
• The program will show compile-time error

Question 2

C

#include <stdio.h>
#define PRINT(i, limit) do \\
                        { \\
                            if (i++ < limit) \\
                            { \\
                                printf(\"GeeksQuiz\\n\"); \\
                                continue; \\
                            } \\
                        }while(0);

int main()
{
    int i = 0;
    PRINT(i, 3);
    return 0;
}

How many times GeeksQuiz is printed in the above program ?

• 1
  

• 3
  

• 4
  

• Compile-time error
  

Question 3

What is the output of the below program? 

C

#include <stdio.h>

int main() {
    int i = 2;
    switch (i) {
        case 0:
            printf("Geeks");
            break;
        case 1:
            printf("Quiz");
            break;
        default:
            printf("GeeksQuiz");
    }
    return 0;
}

• Geeks

• Quiz

• GeeksQuiz

• Compile-time error

Question 4

C

#include <stdio.h>

int main() {
    int i = 3;
    switch (i) {
        case 1:
            printf("Geeks");
            break;
        case 1+2:
            printf("Quiz");
            break;
        default:
            printf("GeeksQuiz");
    }
    return 0;
}

What is the output of the above program?

• Geeks

• Quiz

• GeeksQuiz

• Compile-time error

Question 5

Predict the output of the below program: 

C

#include <stdio.h>

#define EVEN 0
#define ODD 1

int main() {
    int i = 3;
    switch (i % 2) {
        case EVEN:
            printf("Even");
            break;
        case ODD:
            printf("Odd");
            break;
        default:
            printf("Default");
    }
    return 0;
}

• Even

• Odd

• Default

• Compile-time error

Question 6

C

#include <stdio.h>

int main() {
    int i;
    if (printf("0"))
        i = 3;
    else
        i = 5;
    printf("%d", i);
    return 0;
}

Predict the output of above program?

• 3

• 5

• 03

• 05

Question 7

C

#include <stdio.h>

int i;

int main() {
    if (i) {
        // Do nothing
    } else {
        printf("Else");
    }
    return 0;
}

What is correct about the above program?

• if block is executed.

• else block is executed.

• It is unpredictable as i is not initialized.

• Error: misplaced else

Question 8

C

#include<stdio.h>
int main()
{
   int n;
   for (n = 9; n!=0; n--)
     printf(\"n = %d\", n--);
   return 0;
}

What is the output?

• 9 7 5 3 1
• 9 8 7 6 5 4 3 2 1
• Infinite Loop
• 9 7 5 3

Question 9

Output?

C

#include <stdio.h>
int main()
{
    int c = 5, no = 10;
    do {
        no /= c;
    } while(c--);
 
    printf (\"%d\\n\", no);
    return 0;
}

• 1
• Runtime Error
• 0
• Compiler Error

Question 10

C

# include <stdio.h>
int main()
{
   int i = 0;
   for (i=0; i<20; i++)
   {
     switch(i)
     {
       case 0:
         i += 5;
       case 1:
         i += 2;
       case 5:
         i += 5;
       default:
         i += 4;
         break;
     }
     printf(\"%d  \", i);
   }
   return 0;
}

• 5 10 15 20
• 7 12 17 22
• 16 21
• Compiler Error