University:
Kentucky State University
Course:
COS 232| Programming I
Academic year:

2019
Views:

480

Pages:

12
Author:

Lily Callahan

Chapter 1: An Overview of Computers and Programming Languages The Evolution of Programming Languages (cont'd.)   High-level languages include Basic, FORTRAN, COBOL, Pascal, C, C++, C#, and Java Compiler: translates a program written in a high-level language machine language 2 Processing a C++ Program #include using namespace std; int main() { cout << "My first C++ program." << endl; return 0; } Sample Run: My first C++ program. 3 Processing a C++ Program (cont'd.)  To execute a C++ program:    Use an editor to create a source program in C++ Preprocessor directives begin with # and are processed by a the preprocessor Use the compiler to:   Check that the program obeys the rules Translate into machine language (object program) 4 Processing a C++ Program (cont'd.)  To execute a C++ program (cont'd.):  Linker:   Loader:   Combines object program with other programs provided by the SDK to create executable code Loads executable program into main memory The last step is to execute the program 5 Processing a C++ Program (cont'd.) 6 Programming with the Problem Analysis– Coding–Execution Cycle  Programming is a process of problem solving  One problem-solving technique:   Analyze the problem  Outline the problem requirements  Design steps (algorithm) to solve the problem Algorithm:  Step-by-step problem-solving process  Solution achieved in finite amount of time 7 The Problem Analysis–Coding–Execution Cycle (cont’d.) 8 The Problem Analysis–Coding–Execution Cycle (cont'd.)   Run code through compiler If compiler generates errors    If there are no syntax errors   Look at code and remove errors Run code again through compiler Compiler generates equivalent machine code Linker links machine code with system resources 9 The Problem Analysis–Coding–Execution Cycle (cont'd.)    Once compiled and linked, loader can place program into main memory for execution The final step is to execute the program Compiler guarantees that the program follows the rules of the language  Does not guarantee that the program will run correctly 10 Example 1-1   Design an algorithm to find the perimeter and area of a rectangle The perimeter and area of the rectangle are given by the following formulas: perimeter = 2 * (length + width) area = length * width 11 Example 1-1 (cont'd.)  Algorithm:  Get length of the rectangle  Get width of the rectangle  Find the perimeter using the following equation: perimeter = 2 * (length + width)  Find the area using the following equation: area = length * width 12