File Handling | C Programming Questions and Answers | C Programming Free Online-Tests | LucentBlackBoard

01.

What are the files which are automatically opened when a C file is executed?

A.	stdin	B.	stdin, stdout, stderr
C.	stdout	D.	None of these

Answer and Explanation

Answer: stdin, stdout, stderr

Explanation:
stdin, stdout, stderr (standard input, standard output, standard error).

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02.

The statement that defines an input file handle called input_file, which is a pointer to type FILE, is

A.	type input_file as FILE;	B.	FILE *input_file;
C.	input_file FILE;	D.	*FILE input_file;

Answer and Explanation

Answer: FILE *input_file;

Explanation:
There is no explanation...

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03.

Using input_file, open the file results.dat for read mode.

A.	input_file = "results.dat" opened as "r";	B.	open input_file as "results.dat" for "r";
C.	fopen( input_file, "results.dat", "r" );	D.	input_file = fopen( "results.dat", "r" );

Answer and Explanation

Answer: input_file = fopen( "results.dat", "r" );

Explanation:
input_file = fopen( "results.dat", "r" );

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04.

Write C statements which tests to see if input_file has opened the data file successfully. If not, print an error message and exit the program.

A.	Test 1 if( input_file == NULL ) { printf("Unable to open file.\n");\ exit(1); }	B.	Test 2 if( input_file != NULL ) { printf("Unable to open file.\n");\ exit(1); }
C.	Test 3 while( input_file = NULL ) { printf("Unable to open file.\n");\ exit(1); }	D.	Cannot be determined

Answer and Explanation

Answer: Test 1
if( input_file == NULL ) {
printf("Unable to open file.\n");\
exit(1);
}

Explanation:
There is no explanation...

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05.

Write C code which will read a line of characters (terminated by a \n) from input_file into a character array called buffer. NULL terminate the buffer upon reading a \n.

A.	Example 1 int ch, loop = 0; ch = fgetc( input_file ); while( (ch != '\n') && (ch != EOF) ) { buffer[loop] = ch; loop++; ch = fgetc( input_file ); } buffer[loop] = NULL;	B.	Example 2 int ch, loop = 0; ch = fgetc( input_file ); while( (ch = '\n') && (ch = EOF) ) { buffer[loop] = ch; loop--; ch = fgetc( input_file ); } buffer[loop] = NULL;
C.	Example 3 int ch, loop = 0; ch = fgetc( input_file ); while( (ch <> '\n') && (ch != EOF) ) { buffer[loop] = ch; loop++; ch = fgetc( input_file ); } buffer[loop] = -1;	D.	Cannot be determined

Answer and Explanation

Answer: Example 1
int ch, loop = 0;
ch = fgetc( input_file );
while( (ch != '\n') && (ch != EOF) ) {
buffer[loop] = ch;
loop++;
ch = fgetc( input_file );
}
buffer[loop] = NULL;

Explanation:
There is no explanation...

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06.

Choose the file associated with input_file.

A.	close input_file;	B.	fclose( input_file );
C.	fcloseall();	D.	input_file( fclose );

Answer and Explanation

Answer: fclose( input_file );

Explanation:
There is no explanation...

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07.

What is the stand for FIFO?

A.	First in first out	B.	For inter first out
C.	Frame in frame out	D.	None

Answer and Explanation

Answer: First in first out

Explanation:
There is no explanation...

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08.

What is a proper method of opening a file for writing as binary file?

A.	FILE *f = fwrite( "test.bin", "b" );	B.	FILE *f = fopenb( "test.bin", "w" );
C.	FILE *f = fopen( "test.bin", "wb" );	D.	FILE *f = fwriteb( "test.bin" );
E.	FILE *f = fopen( "test.bin", "bw" );