Numbers and Values in Objective-C and C Programming
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This document discusses different types of numbers used in programming including integers like char, short, int, long, and long long. It also covers floating point numbers like float and double. Additionally, it covers printf formatting, integer and floating point math operations, and the math library for trigonometric functions.
Numbers and Values in Objective-C and C Programming
- 1. Paul Solt iPhoneDev.tv Numbers The data behind our apps
- 2. Paul Solt iPhoneDev.tv Overview •Integers (27) •printf() •Floating-point numbers (3.14) •Math libraries
- 3. Paul Solt iPhoneDev.tv Integers •char: ‘a’,‘b’,‘c’ •short: 32,000 •int: 2,000,000,000 •long: 9,000,000,000,000,000,000 •long long: 9,000,000,000,000,000,000
- 4. Paul Solt iPhoneDev.tv Integers •char: ‘a’,‘b’,‘c’ (8 bits = 1 byte) •short: 32,000 (16 bits) •int: 2,000,000,000 (32 bits) •long: 9,000,000,000,000,000,000 (32 or 64 bits) •long long: 9,000,000,000,000,000,000 (64 bits)
- 6. Paul Solt iPhoneDev.tv printf •Formatted text •Tokens •n (i.e. newline or return) %d int %c char %f float/double %s char * (i.e. text) %ld long
- 7. Paul Solt iPhoneDev.tv Math 8 + 4 * 2 = ? (8 + 4) * 2 = ?
- 8. Paul Solt iPhoneDev.tv Integer Division 5 / 2 = ? 5 % 2 = ?
- 9. Paul Solt iPhoneDev.tv Integer Division 5 / 2 = 2 5 % 2 = 1
- 10. Paul Solt iPhoneDev.tv Floating-point Numbers •float: 3.14 •double: 3.141592653
- 11. Paul Solt iPhoneDev.tv Floating-point Numbers •float: 3.14 (32 bits) •double: 3.141592653 (64 bits)
- 12. Paul Solt iPhoneDev.tv Math Library #include <stdlib.h> abs(-13); // absolute value #include <math.h> cos(60 * M_PI / 180.0); // radians