Input / Output - General Questions Multiple Questions and Answers.
Exercise Questions ::
Input / Output
| 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? |
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| 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" |
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| Answer: Option C |
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| Explanation: |
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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" |
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Published by:Michael Daani
| 2. | What is the purpose of "rb" in fopen() function used below in the code? |
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FILE *fp;
fp = fopen("source.txt", "rb");
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| 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 |
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| Answer: Option A |
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| Explanation: |
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The file source.txt will be opened in the binary mode. |
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Tutorial Link: |
Published by:Michael Daani
| 3. | What does fp point to in the program ? |
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#include<stdio.h>
int main()
{
FILE *fp;
fp=fopen("trial", "r");
return 0;
}
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| A. | The first character in the file |
| B. | The last character in the file. |
| C. | A structure which contains a char pointer which points to the first character of a file. |
| D. | The name of the file. |
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| Answer: Option C |
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| Explanation: |
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The fp is a structure which contains a char pointer which points to the first character of a file. |
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Tutorial Link: |
Published by:Michael Daani
| 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+");
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| A. | Reading |
| B. | Writing |
| C. | Appending |
| D. | Read and Write |
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| Answer: Option D |
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| Explanation: |
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r+ Open an existing file for update (reading and writing). |
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Tutorial Link: |
Published by:Michael Daani
| 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;
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| A. | printf("%f %lf", a, b); |
| B. | printf("%Lf %f", a, b); |
| C. | printf("%Lf %Lf", a, b); |
| D. | printf("%f %Lf", a, b); |
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| Answer: Option A |
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| Explanation: |
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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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Tutorial Link: |
Published by:Michael Daani
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