C programming session 02
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This document discusses operators, loops, and formatted input/output functions in C. It covers various categories of operators, how they work, and precedence rules. Loops like for, while and do-while are explained along with break and continue. Formatted I/O functions printf() and scanf() are described, including their syntax and use of format specifiers for input and output of different data types.
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C programming session 02
Editor's Notes
- Begin the session by explaining the objectives of the session.
- Tell the students that they cannot create a useful programs without using the operators. A simple program such as adding two variables and showing the result needs the use of variables.
- Operator precedence is very important in a program. If the operator precedence is not considered then the program might produce an unexpected result. Give an example, which produces a result different from the expected result because of incorrect operator precedence.
- Use Slide 4 to test the student’s understanding on logical operators.
- Use Slide 7 to test the student’s understanding on unary operators.
- Use Slide 10 to test the student’s understanding on binary operators.
- Use this slide to test the student’s understanding on binary operators.
- Use this slide to test the student’s understanding on ternary operators.
- Use this slide to test the student’s understanding on increment/decrement operators.
- Explain definite and indefinite loops. Give some examples, which distinguish between definite and indefinite loops.
- The for loop consists of three parts : Initialization Condition Re-initialization (increment/decrement) In a for loop, after initialization, the condition is first checked. If the condition is valid, the body of the for loop is executed. For each iteration, re-initialization is done before the condition is checked again. Any or all of these parts may be left out of the construct. For example : for ( ; ; ) { } is an infinite loop (as there is no condition).
- Use this slide to test the student’s understanding on loops.
- Use this slide to test the student’s understanding on controlling the loop execution.
- When used with strings, the format string could be quite confusing. The statement: printf ( “%15.5s”, string) prints the first 5 characters of the string right-justified in 15 spaces. When used with floats, it represents the precision required.
- Use this slide to test the student’s understanding on formatted output.
- Use this slide to test the student’s understanding on formatted input.
- Use this slide to test the student’s understanding on formatted input-output.
- The output buffer is flushed only if it is full, or if the string to be printed contains a newline character at the end or if it is explicitly flushed using fflush () . The last option is used if the string does not contain a new line character. The string might not be displayed at the right place at the right time otherwise.
- Use this and the next 4 slides to summarize this session.