C Programming - Input / Output

Why C Programming Input / Output?

In this section you can learn and practice C Programming Questions based on "Input / Output" and improve your skills in order to face the interview, competitive examination and various entrance test (CAT, GATE, GRE, MAT, Bank Exam, Railway Exam etc.) with full confidence.

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Where can I get C Programming Input / Output Interview Questions and Answers (objective type, multiple choice)?

Here you can find objective type C Programming Input / Output questions and answers for interview and entrance examination. Multiple choice and true or false type questions are also provided.

How to solve C Programming Input / Output problems?

You can easily solve all kind of C Programming questions based on Input / Output by practicing the objective type exercises given below, also get shortcut methods to solve C Programming Input / Output problems.

1. 

In a file contains the line "I am a boy\r\n" then on reading this line into the array str using fgets(). What will str contain?

A. "I am a boy\r\n\0"
B. "I am a boy\r\0"
C. "I am a boy\n\0"
D. "I am a boy"

Answer: Option C

Explanation:

Declaration: char *fgets(char *s, int n, FILE *stream);

fgets reads characters from stream into the string s. It stops when it reads either n - 1 characters or a newline character, whichever comes first.

Therefore, the string str contain "I am a boy\n\0"


2. 

What is the purpose of "rb" in fopen() function used below in the code?

FILE *fp;
fp = fopen("source.txt", "rb");

A. open "source.txt" in binary mode for reading
B. open "source.txt" in binary mode for reading and writing
C. Create a new file "source.txt" for reading and writing
D. None of above

Answer: Option A

Explanation:

The file source.txt will be opened in the binary mode.


3. 

What does fp point to in the program ?

#include<stdio.h>

int main()
{
    FILE *fp;
    fp=fopen("trial", "r");
    return 0;
}

A. The first character in the file
B. A structure which contains a char pointer which points to the first character of a file.
C. The name of the file.
D. The last character in the file.

Answer: Option B

Explanation:

The fp is a structure which contains a char pointer which points to the first character of a file.


4. 

Which of the following operations can be performed on the file "NOTES.TXT" using the below code?

FILE *fp;
fp = fopen("NOTES.TXT", "r+");

A. Reading
B. Writing
C. Appending
D. Read and Write

Answer: Option D

Explanation:

r+ Open an existing file for update (reading and writing).


5. 

To print out a and b given below, which of the following printf() statement will you use?

#include<stdio.h>

float a=3.14;
double b=3.14;

A. printf("%f %lf", a, b);
B. printf("%Lf %f", a, b);
C. printf("%Lf %Lf", a, b);
D. printf("%f %Lf", a, b);

Answer: Option A

Explanation:

To print a float value, %f is used as format specifier.

To print a double value, %lf is used as format specifier.

Therefore, the answer is printf("%f %lf", a, b);





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