Introduction Objectives: 1) differentiate between high-level, low-level, and machine language; 2) explain why it is necessary to translate a program
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1 Introduction Objectives: 1) differentiate between high-level, low-level, and machine language; 2) explain why it is necessary to translate a program written in a high-level programming language into machine language; 3) formulate an algorithm given a problem; and 4) construct pseudo codes and flowcharts.
2 Computer program set of instructions that the computer follows to solve a problem. Programs must be in machine language.
3 Example of machine language
4 The 0 s and 1 s are stored inside the computer using two levels of electric voltages. 0 volts represent 0. 5 volts represent 1. Other conventions may be used. Q: What is a machine language? A: Machine language is the language which the computer can directly execute. The language consists of a sequence of 0 s and 1 s.
5 High-Level language - consists of Englishlike statements that make it easier for programmers to write programs. Example: C, Pascal, FORTRAN, COBOL FORTRAN - a blend derived from The IBM Mathematical Formula Translating System) COBOL - COmmon Business-Oriented Language
6 #include <stdio.h> int x, y, z; main () { printf("enter two integers: "); scanf("%d %d", &x, &y); z = x*y; printf("product = %d\n", z); }
7 Translators computer programs that translate programs written in high-level language into machine language. - Also known as compilers. High-Level Language Program Translator Fig 2.1 Translation Process Machine Language Program
8 low-level programming language _ a programming language that provides little or no abstraction from a computer's instruction set architecture. - Machine code - Assembly Language
9 There are several different programming languages. Each of these languages has its own vocabulary and rules to form programs. The choice of which programming language to use depends on the kind of program you re going to write.
10 For example, FORTRAN (FORmula TRANslation) - for scientific computations - capable of dealing with very large and very small numbers, making the computations accurate up to, say, the 1018th decimal digit. COBOL (COmmon Business Oriented Language) when writing business applications.
11 Computer Problem-Solving Process: 1) Problem is analyzed. 2) Formulate appropriate algorithm. 3) Write equivalent program in High-Level Language. 4) The translation of the program from highlevel language to machine language follows 5) Program execution to output results.
12 Problem Algorithm analyze program Program written in high-level language translate Program written in machine language execute Output Figure 2.2. Problem-solving process using a computer
13 Algorithm - a solution to the problem and is specified by following a sequence of steps. Example: Compute for the average of 2 numbers Algorithm 1. Obtain the first number. 2. Obtain the second number. 3. Add the two numbers. 4. Divide the sum by two. 5. Display the quotient.
14 Variable - an entity that contains a value. 2 ways of formally representing algorithms: 1) using pseudo codes 2) using flowcharts Pseudo code - consists of English-like phrases written in a sequence of lines.
15 Pseudo code of the algorithm would be: 1. Input the first number. Store it in variable X. 2. Input the second number. Store it in variable Y. 3. SUM X + Y 4. AVE SUM/2 5. Output the value of AVE. 4 Variables: X, Y, SUM, AVE means we set the value of the variable in the left hand side equal to the value of the expression on the right hand side. The pseudo code above can actually be made shorter by deleting the 3rd line and changing the 4th line to AVE (X + Y)/2.
16 Another way to represent an algorithm is to use a flowchart. Flowchart - a pictorial representation. - allows us to easily visualize the structure of the algorithm.
17 Start / Stop Input Processing Output Decision Flow Lines Figure 2.3 Flow Chart Symbols
18 Start X Y SUM X+Y AVE SUM/2 AVE Stop Figure 2.4. Flowchart to compute the average of two numbers
19 Formulating algorithms and constructing flowcharts require a great deal of logical thinking. It is the first step towards writing a program.
20 Computers can directly execute programs written in machine language only. Programmers use High-Level Language to write programs. Programs are translated to machine language using a special kind of program called a compiler. Algorithm is an outline of the solution Algorithms can be represented in 2 ways: Pseudo code and Flowcharts A pseudo code consists of English-like phrases to describe the algorithm A flowchart consists of graphical symbols.
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