package day02;
//1. for循环:计算 7+77+777+…… 前10项的值
public class Homework {
public static void main(String[] args) {
long sum = 0;
long m = 0;
for (long i = 0; i < 10; i++) {
m = m * 10 + 7;
sum=m+sum;
}
System.out.println(sum);
//2. for循环:计算序列的值:1,-2,3,-4,5,-6……-100
int[] oushu = new int[101];
int[] jishu = new int[101];
int sum1 = 0;
for (int i = 0; i <= 100; i++) {
if (i % 2 == 0) {
oushu = -i;
} else {
jishu = i;
}
sum1 = sum1 + (oushu + jishu);
}
System.out.println(sum1);
for (int j =1;j<=9;j++){
for(int i =1;i<=j;i++){
System.out.print(i+"*"+j+"="+i*j+"\t");
}
System.out.println();
}
}
}
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