Question

用java语言编写:计算并输出一个整数各位数字之和

Answer 1

草草的写了一个，你先看下，我要断网了，下次再聊
public class TestIncreace {

void TestInc(int n){
int []a = new int []{0,0,0,0,0,0,0,0};//这里可以测试8位数
int sum = 0;
for(int i = 0;i < a.length;i ++){
a[i] = n % 10;
n = n / 10;
sum += a[i];
}
System.out.println(sum);
}

public static void main(String[] args) {
TestIncreace t = new TestIncreace();
t.TestInc(1223);//括号内为要测试的数据

}
}

--------------------------------------------------------------------------------------
代码修改：

/*
* 输入一个整数n，输出n的各个位数之和，抛出异常
*/

import java.util.Scanner;

public class TestIncreace {

void TestInc(int n) throws Exception{

int []a = new int [n];
int sum = 0;
for(int i = 0;i < a.length;i ++){
a[i] = n % 10;
n = n / 10;
sum += a[i];
}
System.out.println(sum);

}

public static void main(String[] args) throws Exception {
try{
TestIncreace t = new TestIncreace();
System.out.println("请输入您要测试的数据：");
Scanner input = new Scanner(System.in);
int in = input.nextInt();
t.TestInc(in);//括号内为要测试的数据

}catch(Exception e){
System.out.println("非法数字");
}
}

}

Answer 2

public class Test {

public static void main(String[] args) {

int a = 1203;

int sum = 0;

while(a / 10 != 0){

sum += a % 10;

a = a / 10;

}sum = sum + a;

System.out.println("各位数字之和为" + sum);

}

}

testing

各位数字之和为6

import java.io.*;

public class ssss

{

public static void main(String[] args)
{

String num=null;

System.out.println("请输入一个整数,回车结束");
try

{
InputStreamReader isr=new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(isr);
while((num=br.readLine())!=null&&num.length()!=0)

{
sum(num);
System.out.println("请输入一个整数,回车结束");
}

}
catch(Exception e)
{
e.printStackTrace();
}

}

public static void sum(String num)
{
int b=0;
for(int i=0;i<num.length();i++)
{
b+=Integer.parseInt(num.substring(i,i+1));
}

System.out.println("该整数各个位上数字之和为："+b);
}

}

Answer 3

public int sum(int number) {
int result = 0;
String numStr = String.valueOf(number);
for(int i = 0; i < numStr.length(); i++) {
result += Integer.parseInt("" + numStr.charAt(i));
}
return result;
}

Answer 4

public int getSum(int a){
if(a<0){
a=-a;
}
if(a%10==a){
return a;
}else {
return a%10+getSum(a/10);
}
}

Answer 5

public class Test {

public static void main(String[] args) {
int a = 1203;

int sum = 0;
while(a / 10 != 0){
sum += a % 10;
a = a / 10;
}

sum = sum + a;

System.out.println("各位数字之和为" + sum);

}

}

-----------testing
各位数字之和为6