File Input Output- C Programming MCQ Questions and Answers

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Each section contains 100 MCQs on File Input Output .

Which of the following statements about stdout and stderr are true?

A) Same B) Both connected to screen always C) Both connected to screen by default D) stdout is line buffered but stderr is unbuffered

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

What is the meaning of the following C statement?

printf(“%10s”, state);

A) 10 spaces before the string state is printed B) Print empty spaces if the string state is less than 10 characters C) Print the last 10 characters of the string D) None of the mentioned

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    short int i;
    scanf("%*d", &i);
    printf("%hd", i);
    return 0;
}

A) Compilation error B) Somegarbage value C) Whatever user types D) Depends on the standard

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Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

On freeing a dynamic memory, if the pointer value is not modified, then the pointer points to.

A) NULL B) Other dynamically allocated memory C) The same deallocated memory location D) It points back to the location it was initialized with

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Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

void * malloc(size_t n) returns?

A) Pointer to n bytes of uninitialized storage B) NULL if the request can be satisfied C) Nothing D) None of the mentioned

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

What does the following segment of C code do?

fprintf(fp, "Copying!");

A) It writes "Copying!" into the file pointed by fp B) It reads "Copying!" from the file and prints on display C) It writes as well as reads "Copying!" to and from the file and prints it D) None of the mentioned

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Which of the following represents the function for scanf()?

A) void scanf(char *format, ...) B) int scanf(char *format, ...) C) char scanf(int format, ...) D) char *scanf(char *format, ...)

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Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Which of the following can be used for random number generation?

A) random() B) rnd() C) rndm() D) none of the mentioned

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

What will be the output of the following C code?

#include <stdio.h>
int main()
{
    char *s = "myworld";
    int i = 9;
    printf("%*s", i, s);
}

A) myworld B) myworld(note: spaces to the left of myworld) C) myworld (note:followed by two spaces after myworld) D) Undefined

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Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

What will be the output of the following C statement?

fprintf(stderr, "error: could not open filen");

A) The diagnostic output is directly displayed in the output B) The diagnostic output is pipelined to the output file C) The line which caused error is compiled again D) The program is immediately aborted

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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