13 Questions with answers on 03-top-down-
design-with-functionspdf
You'll find the list of questions at the end of the document
1. What header file is required to use the sqrt function in C?
To use the `sqrt` function, you need to include the `math.h` header file
using the preprocessor directive `#include `.
2. Explain the difference between floor(x) and ceil(x) functions in
C, providing an example for each.
`floor(x)` returns the largest whole number less than or equal to x, while
`ceil(x)` returns the smallest whole number greater than or equal to x. For
example, `floor(3.7)` returns `3.0`, and `ceil(3.7)` returns `4.0`. Similarly,
`floor(-14.2)` returns `-15.0`, and `ceil(-14.2)` returns `-14.0`.
3. Describe the purpose of a structure chart in top-down design.
A structure chart is a documentation tool used in top-down design to
visually represent the relationships among the subproblems of a larger
problem. It shows how the main problem is broken down into smaller, more
manageable modules or functions and how these modules interact with
each other.
4. Explain the concept of procedural abstraction and its advantages
in programming.
Procedural abstraction is a programming technique where the main
function consists primarily of function calls, with each function
implemented separately. This allows for modularity and code reuse. The
advantages include improved code organization, readability, and
maintainability, as well as the ability to reuse functions in different parts of
the program or in other programs.
5. Write a C code snippet that calculates the volume of a cylinder
using a function named volcyl. The function should take the radius
and height as input and return the volume.
```c #include #define PI 3.1416 double volcyl(double r, double h) { double
v; v = PI * r * r * h; return v; } int main() { double radius = 31.7; double
height = 12.5; double volume = volcyl(radius, height); printf("The volume of
the cylinder is: %lf\n", volume); return 0; } ```
6. What is the purpose of the rand() function, and what header file is
required to use it?
The `rand()` function generates a pseudo-random integer number between
0 and `RAND_MAX`. To use it, you need to include the `stdlib.h` header file.
