# c math.h sqrt

/*function prototype of sqrt()*/ double sqrt(double arg); /*sqrt() returns the square root of the number passed on to it the function is available in the math.h library*/

**Here is what the above code is Doing:**

1. The first line is a comment.

2. The second line is a preprocessor directive.

3. The third line is a function prototype.

4. The fourth line is a comment.

5. The fifth line is a function definition.

6. The sixth line is a comment.