50 C Language MCQs with Answers

Question 31

The value printed by the following program is

C

void f(int* p, int m)
{
    m = m + 5;
    *p = *p + m;
    return;
}
void main()
{
    int i=5, j=10;
    f(&i, j);
    printf(\"%d\", i+j);
}

• 10
  

• 20
  

• 30
  

• 40
  

Question 32

Pick the best statement for the following program snippet: 

C

#include <stdio.h>

int main()
{
 int var;  /*Suppose address of var is 2000 */

 void *ptr = &var;
 *ptr = 5;
 printf(\"var=%d and *ptr=%d\",var,*ptr);
             
 return 0;
}

• It will print “var=5 and *ptr=2000”
  

• It will print “var=5 and *ptr=5”
  

• It will print “var=5 and *ptr=XYZ” where XYZ is some random address
  

• Compile error
  

Question 33

What does the following program print?

C

#include
void f(int *p, int *q)
{
  p = q;
 *p = 2;
}
int i = 0, j = 1;
int main()
{
  f(&i, &j);
  printf(\"%d %d \\n\", i, j);
  getchar();
  return 0;
}

• 2 2
  

• 2 1
  

• 0 1
  

• 0 2 
  

Question 34

What does the following expression means ? 
char ∗(∗(∗ a[N]) ( )) ( );

• a pointer to a function returning array of n pointers to function returning character pointers.
  

• a function return array of N pointers to functions returning pointers to characters
  

• an array of n pointers to function returning pointers to characters
  

• an array of n pointers to function returning pointers to functions returning pointers to characters.
  

Question 35

The following statement in ‘C’ 
int (*f())[ ]; 
declares

• a function returning a pointer to an array of integers.
  

• a function returning an array of pointers to integers.
  

• array of functions returning pointers to integers.
  

• an illegal statement.
  

Question 36

Assume that a character takes 1 byte. Output of following program? 

C

#include<stdio.h>
int main()
{
    char str[20] = \"GeeksQuiz\";
    printf (\"%d\", sizeof(str));
    return 0;
}

• 9
  

• 10
  

• 20
  

• Garbage Value
  

Question 37

Predict the output of following program, assume that a character takes 1 byte and pointer takes 4 bytes.

C

#include <stdio.h>
int main()
{
    char *str1 = \"GeeksQuiz\";
    char str2[] = \"GeeksQuiz\";

    printf(\"sizeof(str1) = %d, sizeof(str2) = %d\",
           sizeof(str1), sizeof(str2));

    return 0;
}

• sizeof(str1) = 10, sizeof(str2) = 10 
  
  

• sizeof(str1) = 4, sizeof(str2) = 10
  

• sizeof(str1) = 4, sizeof(str2) = 4
  

• sizeof(str1) = 10, sizeof(str2) = 4
  

Question 38

A language with string manipulation facilities uses the following operations. 

head(s)- returns the first character of the string s 
tail(s)- returns all but the first character of the string s 
concat(sl, s2)- concatenates string s1 with s2. 

The output of concat(head(s), head(tail(tail(s)))), where s is acbc is

• ab
  

• ba
  

• ac
  

• as
  

Question 39

In below program, what would you put in place of “?” to print “Quiz”?

C

#include <stdio.h>
int main() 
{ 
  char arr[] = \"GeeksQuiz\"; 
  printf(\"%s\", ?); 
  return 0; 
}

• arr
  

• (arr+5)
  

• (arr+4)
  

• Not possible
  

Question 40

Consider the following C program segment. 

C

# include <stdio.h>
int main( )
{
    char s1[7] = \"1234\", *p;
    p = s1 + 2;
    *p = \'0\' ;
    printf (\"%s\", s1);
}

What will be printed by the program?

• 12 
  
  

• 120400
  

• 1204 
  

• 1034