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What should the header files not contain?

What does sscanf() do?

We want to write a function to calculate the sum of all elements in an array. The function should take the array as a parameter and return the sum. Which of the following should the function prototype in C?

If you have a struct to hold information a 2D coordinate, which of the following declarations are correct? 

Why would you use an indefinite loop, as opposed to a definite loop, to read in all the contents from a file?

What is the correct code for a macro to take in two parameters and evaluate to the lesser of the two values passed in? 

Given this macro:  #define doSomething( x, y ) ( 2 * x – y ) What is the value of result after this code?   int result = doSomething( 3, 2 );

If you attempt to fopen() a file for writing, but the file does not exist, what happens?

What does the following fgets() expression do assuming fileIn points to an existing file for input? char buffer[ 1024 ]; fgets( buffer, 1024, fileIn );

Which of the following is a valid function call (assuming the function ‘test’ exists)?