第一题:
package javastudy202103;
public class Main {
public static void main(String[] args) {
int[] ns = { 1, 4, 9, 16, 25 };
System.out.println("首先遍历数组");
for (int i=0;i<ns.length;i++ ) {
System.out.println(ns[i]);
}
System.out.println("接下来进行颠倒顺序并输出打印");
for(int j=ns.length-1;j>=0;j--){
System.out.println("输出结果为:"+ns[j]);
第二题:
for (int n:ns) {
System.out.println(n);
int sum=0;
for(int i=0;i<ns.length;i++){
sum=sum+ns[i];
System.out.println(sum);
第三题:
double pi = 0;
for (double i = 1; i <= 100000; i += 4) {
pi += 4/i;
pi -= 4/(i + 2);
System.out.print(pi);
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第一题:
package javastudy202103;
public class Main {
public static void main(String[] args) {
int[] ns = { 1, 4, 9, 16, 25 };
System.out.println("首先遍历数组");
for (int i=0;i<ns.length;i++ ) {
System.out.println(ns[i]);
}
System.out.println("接下来进行颠倒顺序并输出打印");
for(int j=ns.length-1;j>=0;j--){
System.out.println("输出结果为:"+ns[j]);
}
}
}
第二题:
package javastudy202103;
public class Main {
public static void main(String[] args) {
int[] ns = { 1, 4, 9, 16, 25 };
for (int n:ns) {
System.out.println(n);
}
int sum=0;
for(int i=0;i<ns.length;i++){
sum=sum+ns[i];
}
System.out.println(sum);
}
}
第三题:
package javastudy202103;
public class Main {
public static void main(String[] args) {
double pi = 0;
for (double i = 1; i <= 100000; i += 4) {
pi += 4/i;
pi -= 4/(i + 2);
}
System.out.print(pi);
}
}