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#1 Created at ... [Delete] [Delete and Lock User] 
public class DuoweiArray {    public static void main(String[] args) {        int[][] scores = {                {82,90,91},                {68,72,64},                {95,91,89},                {67,52,60},                {79,81,85}        };        int sum = 0;        int length = 0;        double average = 0;        for (int[] stu : scores){            for (int stuscore : stu){                sum += stuscore;                length++;            }        }        System.out.println(sum);        System.out.println(length);        average = (double) sum/length;  //类型必须为double,如果是float，就通不过测试了        System.out.println(average);        if (Math.abs(average-77.733333) < 0.000001){            System.out.println("测试成功");        }else{            System.out.println("测试失败");        }            }}

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#2 Created at ... [Delete] [Delete and Lock User]

public class DuoweiArray {
public static void main(String[] args) {
int[][] scores = {
{82,90,91},
{68,72,64},
{95,91,89},
{67,52,60},
{79,81,85}
};

int sum = 0;
int length = 0;
double average = 0;

for (int[] stu : scores){
for (int stuscore : stu){
sum += stuscore;
length++;
}
}
System.out.println(sum);
System.out.println(length);

average = (double) sum/length; //类型必须为double,如果是float，就通不过测试了
System.out.println(average);

if (Math.abs(average-77.733333) < 0.000001){
System.out.println("测试成功");
}else{
System.out.println("测试失败");
}

}
}

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