File Input Output- C Programming MCQ Questions and Answers

11

What is function srand(unsigned)?

A) Sets the seed for rand B) Doesn't exist C) Is an error D) None of the mentioned

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Answer & Solution

Answer: Option A

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12

What is the purpose of the C function?

int ferror(FILE *fp)

A) They check for input errors B) They check for output errors C) They check for all types of errors D) They check for error in accessing the file

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Answer & Solution

Answer: Option B

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13

What if size is zero in the following C statement?

realloc(ptr, size)

A) Allocate a memory location with zero length B) Free the memory pointed to by ptr C) Undefined behaviour D) Doesn't do any reallocation of ptr i.e. no operation

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Answer & Solution

Answer: Option B

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14

Select the right explanation to the given code.

printf(“%*. *f”, 5,4,5700);

A) the minimum field width has to be 4, the precision is given to be 5, and the value to be displayed is 5700 B) the minimum field width is 5, the precision is 4, and the value to be displayed is 5700 C) compile error D) run-time error

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Answer & Solution

Answer: Option B

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15

Which of the following should be used for freeing the memory allocated in the following C code?

#include <stdio.h>
struct p
{
    struct p *next;
    int x;
};
int main()
{
    struct p *p1 = (struct p*)malloc(sizeof(struct p));
    p1->x = 1;
    p1->next = (struct p*)malloc(sizeof(struct p));
    return 0;
}

A)

free(p1);
free(p1->next)

B)

free(p1->next);
free(p1);

C)

free(p1);

D) all of the mentioned

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Answer & Solution

Answer: Option B

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16

Which of the following function with ellipsis are illegal?

A) void func(...); B) void func(int, ...); C) void func(int, int, ...); D) none of the mentioned

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Answer & Solution

Answer: Option A

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17

What will be the output of the following C code?

#include <stdio.h>
struct p
{
    struct p *next;
    int x;
};
int main()
{
    struct p *p1 = calloc(1, sizeof(struct p));
    p1->x = 1;
    p1->next = calloc(1, sizeof(struct p));
    printf("%d\n", p1->next->x);
    return 0;
}

A) Compile time error B) 1 C) Somegarbage value D) 0

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Answer & Solution

Answer: Option D

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18

Which of the following mathematical function requires 2 parameter for successful function call?

A) fmod(); B) div(); C) atan2(); D) all of the mentioned

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Answer & Solution

Answer: Option D

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19

How many characters for pushback is guaranteed per file while using ungetc(c, fp);?

A) Only 1 character B) Characters within 1 word C) Characters within 1st new-line D) All characters upto NULL character

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Answer & Solution

Answer: Option A

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20

Which of the following function can be used to terminate the main() function from another function safely?

A) return(expr); B) exit(expr); C) abort(); D) both exit(expr); and abort();

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Answer & Solution

Answer: Option B

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