Question

C programming

true or false

1) Pointer in a C program can only point to built in types of variables in C.

2) In order to work with an external file, we must declare pointer to file first.

3) In order to use an external file in a C program, pointer to file must be declared first.

4) Header files created by a programmer, must be enclosed in <>, the same as the header files taken from a C library

Answer 1

1. Pointer is an object whose value points to (or refers to some other value stored at some memory address. Pointers can be declared for primitive as well as user defined data types like structure. Therefore, statement is False. 2. In order to access external file from c program, fopen() function is used to open a file which returns a pointer to FILE datatype. Therefore, pointer to file must be declared first. Therefore, statement is True. 3. fopen() function used to open external file returns a FILE type pointer, which requires declaring pointer to file. Therefore, statement is True. 4. Both standard C library header files and user created header files can be used either with <> or double inverted commas. Usually preferred practice is to use standard library files with <> and user created header files with double inverted commas in order to differentiate between them. Therefore, the statement is False.