What does the following C statement mean? C scanf("%4s", str);

Read maximum 4 characters from console.

Read exactly 4 characters from console.

Read a string str in multiples of 4

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50 C Language MCQs with Answers

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Question 1

#include <stdio.h>
// Assume base address of "GeeksQuiz" to be 1000
int main()
{
   printf(5 + "GeeksQuiz");
   return 0;
}

GeeksQuiz
Quiz
1005
Compile-time error

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Question 2

What does the following C statement mean?

 scanf("%4s", str);

Read exactly 4 characters from console.
Read maximum 4 characters from console.
Read a string str in multiples of 4
Nothing

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Question 3

Consider the following ANSI C code segment:

z=x + 3 + y->f1 + y->f2;
for (i = 0; i < 200; i = i + 2)
{
if (z > i)
{
p = p + x + 3;
q = q + y->f1;
} else
{
p = p + y->f2;
q = q + x + 3;
}
}
Assume that the variable y points to a struct (allocated on the heap) containing two fields f1 and f2, and the local variables x, y, z, p, q, and i are allotted registers. Common sub-expression elimination (CSE) optimization is applied on the code. The number of addition and the dereference operations (of the form y ->f1 or y ->f2) in the optimized code, respectively, are:

403 and 102
203 and 2
303 and 102
303 and 2

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Question 4

Which of the following is true?

gets() doesn't do any array bound testing and should not be used.
fgets() should be used in place of gets() only for files, otherwise gets() is fine
gets() cannot read strings with spaces
None of the above

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Question 5

Predict the output?

int fun(char *str1)
{
    char *str2 = str1;
    while (*++str1)
        ;
    return (str1 - str2);
}
int main()
{
    char *str = "GeeksQuiz";
    printf("%d", fun(str));
    return 0;
}

10
9
8
Random Number

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Question 6

Given that x = 7.5, j = -1.0, n = 1.0, m = 2.0 the value of - - x + j == x>n> = m is:

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Question 7

If n has 3, then the statement a[++n]=n++;

assigns 3 to a[5]
assigns 4 to a[5]
assigns 4 to a[4]
what is assigned is compiler dependent

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Question 8

#include "stdio.h"

int main() 

{ 

  int x, y = 5, z = 5; 

  x = y == z; 

  printf("%d", x); 

  getchar(); 

  return 0; 

}

0
1
5
Compiler Error

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Question 9

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

What is the output of the above program?

3
4
5
Compile-time error

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Question 10

Which of the following is not a logical operator?

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