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 鍖oat/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