File Input Output- C Programming MCQ Questions and Answers

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Each section contains 100 MCQs on File Input Output .

The syntax of fgets is char *fgets(char *line, int maxline, FILE *fp). Which is true for fgets?

A) Returns line on success B) On end of file or error it returns NULL C) Nothing D) Both returns line on success & On end of file or error it returns NULL

Discuss

Answer & Solution

Answer: Option D

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

What does the following C code snippet mean?

char *gets(char *s)

A) reads the next input line into the array s B) writes the line into the array s C) reads the next input character into the array s D) write a character into the array

Discuss

Answer & Solution

Answer: Option A

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

Which functions is declared in ?

A) fseek() B) ftell() C) ferror() D) fsetpos()

Discuss

Answer & Solution

Answer: Option C

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

What does scanf() function return?

A) Number of successfully matched and assigned input items B) Nothing C) Number of characters properly printed D) Error

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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()
{
    FILE *fp = stdout;
    stderr = fp;
    fprintf(stderr, "%s", "hello");
}

A) Compilation error B) hello C) Undefined behaviour D) Depends on the standard

Discuss

Answer & Solution

Answer: Option B

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

What is the use of symbol * in the control string as shown [=%[*][width] [modifiers] type=]?

A) * is optional and used when the data should be read from the stream but ignored B) * is not optional, used to read data from the stream but it is not ignored C) * is not optional, it is used to read data stream but ignored D) * is optional and used to read data from stream but it is not ignored

Discuss

Answer & Solution

Answer: Option A

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

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

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

For a typical program, the input is taken using . . . . . . . .

A) scanf B) Files C) Command-line D) All of the mentioned

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Answer & Solution

Answer: Option D

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

What is the return value of putchar()?

A) The character written B) EOF if an error occurs C) Nothing D) Both character written & EOF if an error occurs

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Answer & Solution

Answer: Option D

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 f(char chr, ...);
int main()
{
    char c = 97;
    f(c);
    return 0;
}
int f(char c, ...)
{
    printf("%c\n", c);
}

A) Compile time error B) Undefined behaviour C) 97 D) a

Discuss

Answer & Solution

Answer: Option D

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

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