求出平均分、最高分和最低分，冒泡法排序，求绝对值函数，可以对整型、双精度型、字符型数据（ascii值）、复数求绝对值。二维数组的行和列元素互换，三个字符串，要求找出其中最大者，字符串拷贝的函数-Find the average, highest and lowest points, bubble sort method, find the absolute value function, can be an integer, double, character data (ascii value), complex absolute value. Two-dimensional array of rows and columns elements of exchange, three strings, asked to identify the greatest of the string copy function