Numbers and Values in Objective-C and C Programming

Numbers and Values in Objective-C and C Programming

• 1.
  Paul Solt iPhoneDev.tv Numbers The databehind our apps
• 2.
  Paul Solt iPhoneDev.tv Overview •Integers (27) •printf() •Floating-pointnumbers (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)
• 5.
  Paul Solt iPhoneDev.tv Overflow 99999 99999 10000000 10000000
• 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
• 13.
  Paul Solt iPhoneDev.tv Review •Integers •printf() •Floating-point numbers •Mathlibraries
• 14.
  Paul Solt iPhoneDev.tv