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Lecture 02

# 1 2 request a value for a request a value for b 3 4 5

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Unformatted text preview: ;B Return A End Finds the Min of 2 numbers This algorithm utilizes: a) Only Sequence a) Sequence and Selection a) Sequence and Iteration b) Sequence, Selection and Iteration What Tool(s) Does this Algorithm Use? 1. 2. 3. 4. 5. 6. 7. Request a value for A Assign 1 to B While A > 1 Assign A*B to B Assign A1 to A Return B End This algorithm utilizes: a) Only Sequence b) Sequence and Selection c) Sequence and Iteration d) Sequence, Selection and Iteration What Tool(s) Does this Algorithm Use? 1. 2. 3. 4. 5. 6. 7. Request a value for A Assign 1 to B While A > 1 Assign A*B to B Assign A1 to A Return B End Computes the factorial of A This algorithm utilizes: a) Only Sequence b) Sequence and Selection a) Sequence and Iteration a) Sequence, Selection and Iteration From Algorithms To Programs So far we have described a few algorithms in pseudocode. Pseudocode is fine for communicating algorithms between people but it is not precise enough to be used by a computer. Our Algorithms Must Be Written in a Programming Language A programming language has precise syntax (grammar) and semantics (meaning). An algorithm in a programming language is called a program. To be used by the machine it must be translated into a native language specific to the computer's CPU (central processing unit) called machine language. This translation is done by a compiler. Writing directly in machine language is taxing for humans because it is so rudimentary. Reading A C++ Program #include <iostream> using namespace std; int main ( ) { double x, y; cin >> x; y = x * 7; cout << y; return 0; } Reading A C++ Program Much of this program is scaffolding. int main ( ) Scaffolding is only { important insomuch as it double x, y; holds the program together cin >> x; and provides context for y = x * 7; the C++ compiler. cout << y; We will consider this part return 0; of the program later. } #include <iostream> using namespace std; Reading A C++ Program The remaining part of the code consists of only 4 lines. The code reads in a number and then writes the result of multiplying the number by...
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