Just4Fun - PreIncrement vs PostIncrement

来源：互联网发布：淘宝直通车有必要开吗编辑：程序博客网时间：2024/05/17 05:04

/* By Dylan SUN */

Pre-Increment and Post-Increment are used frequently in conditions for loops.

Here we are playing a calculation game with Post and Pre Increment.

Example 1:

int i = 10;Console.WriteLine(i++); //=> 10Console.WriteLine(i); //=> 11

Example 2:

int i = 10;Console.WriteLine(++i); //=> 11Console.WriteLine(i); //=> 11

Example 3:

int i = 10;Console.WriteLine(i--); //=> 10Console.WriteLine(i); //=> 9

Example 4:

int i = 10;Console.WriteLine(--i); //=> 9Console.WriteLine(i); //=> 9

Example 5:

int i = 5;var result1 = i++ + ++i;Console.WriteLine(string.Format("i=5; i++ + ++i result is : '{0}'", result1)); //=> 12i = 5;var result2 = ++i + i++;Console.WriteLine(string.Format("i=5; ++i + i++ result is : '{0}'", result2)); //=> 12i = 5;var result3 = i++ - ++i;Console.WriteLine(string.Format("i=5; i++ - ++i result is : '{0}'", result3)); //=> -2i = 5;var result4 = ++i - ++i;Console.WriteLine(string.Format("i=5; ++i - ++i result is : '{0}'", result4)); //=> -1i = 5;var result5 = ++i - i++;Console.WriteLine(string.Format("i=5; ++i - i++ result is : '{0}'", result5)); //=> 0i = 5;var result6 = i++ + i++;Console.WriteLine(string.Format("i=5; i++ + i++ result is : '{0}'", result6)); //=> 11

Example 6:

int i = 5;var result1 = i-- + --i;Console.WriteLine(string.Format("i=5; i-- + --i result is : '{0}'", result1)); //=> 8i = 5;var result2 = --i + i--;Console.WriteLine(string.Format("i=5; --i + i-- result is : '{0}'", result2)); //=> 8i = 5;var result3 = i-- - --i;Console.WriteLine(string.Format("i=5; i-- - --i result is : '{0}'", result3)); //=> 2i = 5;var result4 = --i - --i;Console.WriteLine(string.Format("i=5; --i - --i result is : '{0}'", result4)); //=> 1i = 5;var result5 = --i - i--;Console.WriteLine(string.Format("i=5; --i - i-- result is : '{0}'", result5)); //=> 0i = 5;var result6 = i-- + i--;Console.WriteLine(string.Format("i=5; i-- + i-- result is : '{0}'", result6)); //=> 9

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