Exercise :: Input / Output - True / False Questions
| 1. | While calling the fprintf() function in the format string conversion specifier %s can be used to write a character string in capital letters. |
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Answer: Option B Explanation: The %s format specifier tells the compiler the given input was string of characters. |
| 2. | A text stream is an ordered sequence of characters composed into lines, each line consisting of zero or more characters plus a terminating new-line character. |
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Answer: Option A Explanation: True, each line may contain zero or more characters terminated by a newline character. |
| 3. | Offset used in fseek() function call can be a negative number. |
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Answer: Option A Explanation: True, offset in fseek() function can be a negative number. It makes the file pointer to move backwards from the current position. Declaration: retval = fseek( fp, offset, from ); Where: FILE *fp; = points to the file on which I/O is to be repositioned. long offset; = is an integer giving the number of bytes to move forward or backward in the file. This may be positive or negative. int from; = is one of the manifests SEEK_SET, SEEK_CUR, or SEEK_END. int retval; = is non-zero if the seek operation was invalid (e.g. on a file not opened with a "b" option); otherwise, the return value is zero. |
| 4. | We should not read after a write to a file without an intervening call to fflush(), fseek() or rewind() |
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Answer: Option A Explanation: True, we should not be able to read a file after writing in that file without calling the below functions. int fflush ( FILE * stream ); If the given stream was open for writing and the last i/o operation was an output operation, any unwritten data in the output buffer is written to the file. int fseek ( FILE * stream, long int offset, int origin ); Its purpose is to change the file position indicator for the specified stream. void rewind ( FILE * stream ); Sets the position indicator associated with stream to the beginning of the file. |
| 5. | In a call to printf() function the format specifier %b can be used to print binary equivalent of an integer. |
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Answer: Option B Explanation: There is no format specifier named %b in c. |