java程序：.计算1+2+3+……+99并输出结果(for while do-while)

Question

如题所述

Answer 1

public class Sum
{
public static void main(String[] args)
{
int i=1,sum=0;
while(i<=99)
{
sum=sum+i;
i++;
}
System.out.print(+sum);
}
}注意文件名哈

Answer 2

public class Test {

/**
* for count
* @return
*/
public static void forCount(){
int num=0;
for(int i=1;i<100;i++){
num=num+i;
}
System.out.println("for count num is:"+num);
}

/**
* while count
* @return
*/
public static void whileCount(){
int num=0;
int i=1;
while(i<100){
num=num+i;
i++;
}
System.out.println("while count num is:"+num);
}

/**
* do while count
* @return
*/
public static void doWhileCount(){
int num=0;
int i=1;
do{
num=num+i;
i++;
}while(i<100);
System.out.println("do while count num is:"+num);
}

public static void main(String[] args){
forCount();
whileCount();
doWhileCount();
}
}

Answer 3

public class Sum{ public static void main() { int sum = 0; for(int i = 1; i < 100; i++) { sum += i; } System.out.println("Sum = " + sum); }}