c programming quiz with solution

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

Answer:

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

2) what will be the position of the file marker?

a: fseek(ptr,0,SEEK_SET);

b: fseek(ptr,0,SEEK_CUR);

Answer :

a: The SEEK_SET sets the file position marker to the starting of the file.

b: The SEEK_CUR sets the file position marker to the current position

of the file.

3) main()

{

char name[10],s[12];

scanf(" \"%[^\"]\"",s);

}

How scanf will execute? 

Answer:

First it checks for the leading white space and discards it.Then it matches with a quotation mark and then it  reads all character upto another quotation mark.

4)What is the problem with the following code segment?

while ((fgets(receiving array,50,file_ptr)) != EOF);

Answer & Explanation:

fgets returns a pointer. So the correct end of file check is checking for != NULL.

5) main()

{

main();

}

Answer:

 Runtime error : Stack overflow.

Explanation:

main function calls itself again and again. Each time the function is called its return address is stored in the call stack. Since there is no condition to terminate the function call, the call stack overflows at runtime. So it terminates the program and results in an error.

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