程序中第一个for语句中又嵌套了一个for语句组成了双重循环。外循环控制逐行处理，并把每行的第0列元素赋予l。进入内循环后，把l与后面各列元素比较，并把比l大者赋予l。内循环结束时l 即为该行最大的元素，然后把l值赋予b[i]。等外循环全部完成时，数组b中已装入了a各行中的最大值。后面的两个 for语句分别输出数组a和数组b。-Procedures for the first statement and a nested for statement composition of a double cycle. Outside the control of progressive processing cycle, and each line of the first element of 0 given l. After entering the inner loop to the back of the list l with the element of comparison, and given the larger l than l. Loop the end of the line l is the largest element, and then to give the l value b [i]. External cycle completed, the array b has been put into the line of a maximum. Two for the back of the array a statement, respectively, and an array of output b.