Which header file includes a function for variable number of arguments?
A. stdlib.h
B. stdarg.h
C. ctype.h
D. both stdlib.h and stdarg.h
Answer: Option B
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A. stdio.h
B. iostream.h
C. fileio.h
D. files.h
Which function is used to open a file in C for writing?
A. fopen()
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D. createfile()
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A. A built-in data type for files
B. A file descriptor
C. A file pointer
D. A file structure
How do you check if a file was opened successfully in C?
A. Use the 'filestatus' variable
B. Check the return value of fopen()
C. Use the 'fileopen' function
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