C Questions and Answers – Standard Definition

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Standard Definition”.

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

1. Some types and macros defined under the header file stddef.h may be defined under other header files too.
a) True
b) False
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2. size_t is of ______________ type.
a) signed integer
b) signed character
c) unsigned integer
d) unsigned character
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3. Which of the following returns a signed integer type on finding the difference between two pointers to elements in the same array?
a) __cptrdiff__
b) cptrdiff_t
c) __ptrdiff__
d) ptrdiff_t
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4. What will be the output of the following C code?

#include <stddef.h>
int main(void)
{
    int num[10];
    int *p1=&num[14], *p2=&num[19];
    ptrdiff_t a = p1-p2;
    printf("%d", a);
}

a) 5
b) -5
c) error
d) 10
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5. What will be the output of the following C code?

#include <stddef.h>
int main(void)
{
    int num[15];
    int *p1=&num['a'], *p2=&num['A'];
    ptrdiff_t d = p1-p2;
    printf("%d", d);
}

a) 15
b) -32
c) 32
d) error
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6. Which of the following is not defined under the header file stddef.h?
a) size_t
b) ptrdiff_t
c) exp_t
d) null
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7. Point out the error (if any) in the following C code?

#include <stdlib.h>
#include <stdio.h>
int main(void)
{
    int* p = NULL;
    struct S *s = NULL;
    void(*f)(int, double) = NULL;
    char *ptr = malloc(15);
    if (ptr == NULL) printf("Out of memory");
    free(ptr);
}

a) Error in the statement: void(*f)(int, double) = NULL;
b) Error in the statement: char *ptr = malloc(15);
c) Error in the statement: struct S*s = NULL;
d) No error
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8. A type whose alignment requirement is at least as large as that of every data type ____________
a) max_align_t
b) ptrdiff_t
c) size_t
d) null
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9. The macro offset expands to a constant of type __________________
a) size_t
b) print_t
c) ptrdiff_t
d) null
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10. When we use multiple alignas specifiers in the same declaration, the ____________ one is used.
a) first
b) strictest
c) last
d) middle
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