Question

java编写使用循环2+4+6+8+10+......+n,总共50个数相加的程序

Answer 1

package a;

public class xunhuan {
public static void main(String[] args) {
int sum=0;
int a=2;
for (int i = 0; i < 50; i++) {
sum+=a;
a+=2;
}
System.out.println(sum);
}
}

Answer 2

public class Test1 {
public static void main(String[] args) {
int sum=0;
for(int i=2;i<=100;i++){
sum+=i;
i++;
}
System.out.println(sum);
}
}