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Program style and Form

Program style and Form. Original Source : http://www.ftsm.ukm.my/zma/TK1914/05-Algorithms and Problem Solving.ppt. This statement is syntactically incorrect. USE OF WHITESPACE.

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Program style and Form

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  1. Program style and Form Original Source : http://www.ftsm.ukm.my/zma/TK1914/05-Algorithms and Problem Solving.ppt

  2. This statement is syntactically incorrect. USE OF WHITESPACE • Insert white space characters (such as blanks, tabs and newlines) if necessary to increase the readability of your source code. Example: int matrix[][3] = {1, 0, 0, 0, 1, 0, 0, 0, 1}; int matrix[][3] = { 1, 0, 0, 0, 1, 0, 0, 0, 1 }; • White space characters are ignored by the compiler during compilation. • Remember to separate reserved words and identifiers from each other and other symbols. Example: inta, b, c;

  3. COMMAS AND SEMICOLONS • Commas separate items in a list. Example: inta, b, c; • All C++ statements end with a semicolon. Example: area = length * width; • Semicolon is also called a statement terminator.

  4. DOCUMENTATION • Programs are easier to read and maintain if they are well-documented. • Comments can be used to document code • Single line comments begin with // anywhere in the line • Multiple line comments are enclosed between /* and */

  5. DOCUMENTATION • Avoid putting in useless comments such as shown below: int main() { … min = elapsed_time / 60; // assign elapsed_time / 60 to min sec = elapsed_time % 60; // assign elapsed_time % 60 to sec hr = min / 60; // assign min / 60 to hr min = min % 60; // assign min % 60 to min … }

  6. DOCUMENTATION • The program comments below are more useful: int main() { … // Convert elapsed_time to min:sec min = elapsed_time / 60; sec = elapsed_time % 60; // Convert min:sec to hr:min:sec hr = min / 60; min = min % 60; … }

  7. DOCUMENTATION • Name identifiers with meaningful names. • For example, which of the statements below is more meaningful? a = l * w; area = length * width;

  8. Form and Style • Consider two ways of declaring variables: • Method 1 int feet, inch; double x, y; • Method 2 int a,b;double x,y; • Both are correct, however, the second is hard to read

  9. YOU SHOULD NOW KNOW… • importance of program readability • using whitespace characters • inserting comments • using meaningful names for identifiers

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