C Programming Multiple Choice Question - Printf & Scanf

This section focuses on the "Printf And Scanf" of the C programming. These Multiple Choice Questions (mcq) should be practiced to improve the C programming skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

1. What is the output of this program?

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

A. variable! x
B. variable! followed by a junk value
C. Compile time error
D. variable!

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2. What is the output of this program?

#include <stdio.h>
int main()
{
    int main = 3;
    printf("%d", main);
    return 0;
}

A. 3
B. Compile time error
C. Run time error
D. give garbage value

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3. What is the output of this program?

#include <stdio.h>
int main()
{
    int a, b;
    printf("%d", scanf("%d%d",&a,&b));
    return 0;
}

A. 1
B. 2
C. Value of a
D. compile time error

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4. What is the output of this program?

#include <stdio.h>
void main()
{
    printf("hello\rworld\n");
    printf("hello\b\b\bworld\n");
}

A. hello
     helloworld
B. world
    heworld
C. helloworld
    hellold
D. None of the mentioned

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5. What is the output of this program?

#include<stdio.h>
int main()
{
    int i;
    i = printf("letsfindcourse");
    i = printf("%d ", i);
    printf("%d ", i);
    return 0;
}

A. letsfindcourse 15 3
B. letsfindcourse 14 2
C. letsfindcourse 14 3
D. Compilation Error

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6. Output of this statment is :

 
printf ( "%d" , printf ( "hello" ) );

A. Syntex Error
B. hello5
C. gives garbage value
D. print hello and terminates

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7. What is the output of this program?

#include <stdio.h>
# define scanf  "%s Find best course "
main()
{
   printf(scanf, scanf);
   return 0;
}

A. %s Find best course Find best course
B. %s Find best course %s Find best course
C. Invalid Syntex
D. Run time error

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8. Which statment is true about the given code ?

#include <stdio.h>
int main()
{
  printf("%d", main);
  return 0;
}

A. Goes in infinite loop
B. Gives Address of function main.
C. Gives garbage value
D. Compilation Error

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9. What is the output of this program?

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

A. 1
B. 2
C. 3
D. Invalid Syntax

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10. Comment on the given statment:

scanf("%d",i);

A. Will execute without any error
B. Will give Segmentation fault
C. Will give Compilation Error
D. None of the above

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