说明：  //1.从键盘输入一行字符，分别统计其中字母字符和数字字符的个数 //2.从键盘输入十个整形数据，要求输出其中最小的数据 //3.从键盘上输入10个字符，然后按相反次序输出 //4.从键盘上输入10个整数，求他们的平均值以及正数的个数，并加以输出
(//1. Line characters from the keyboard, the letters were statistics on the number of characters and numeric characters// 2. From ten plastic keyboard input data, which requires the minimum output data// 3. From the 10 characters on the keyboard , then the output in reverse order// 4. from the keyboard input 10 integer, find their average, and the number of positive, and to output)