首先输入要输入的整数个数n，然后输入n个整数。输出为n个整数中负数的个数，和所有正整数的平均值，结果保留一位小数。
0即不是正整数，也不是负数，不计入计算。如果没有正数，则平均值为0。
数据范围： 
，输入的整数都满足 
[编程题]记负均正
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
// 注意 hasNext 和 hasNextLine 的区别
int a = in.nextInt();
int count=0;
int sum = 0;
int count2=0;
for(int i=0;i<a;i++){
int b = in.nextInt();
if(b<0){
count++;
}else if(b>0){
sum+=b;
count2++;
}
}
double avg =0.0;
if(count2!=0){
avg = (double)sum/count2;
}
System.out.print(count+" "+String.format("%.1f",avg));
}
} 算法很简单，但是难点在于两个点：
1、输出为保留一位小数的值，需要使用String.format("%.1f",avg) 进行转换
2、两个整数相除怎么能有小数，如果这么写 (double)(sum/count2)，结果小数位一直为0，需要将sum转为double型才行，即 (double)sum/count2
3、需要处理被除数为0 的情况
发表于 2023-09-05 18:34:34
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import java.util.Scanner;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
// 注意 hasNext 和 hasNextLine 的区别
while (in.hasNextInt()) { // 注意 while 处理多个 case
int a = in.nextInt();
int sum = 0;
int positiveNumber = 0;
int negativeNumber = 0;
for(int i= 0; i < a;i++){
int n = in.nextInt();
if(n > 0 && n != 0){
sum += n;
positiveNumber ++;
}else if (n < 0){
negativeNumber++;
}
}
double dou = 0;
if (positiveNumber != 0) {
dou = (double) sum/positiveNumber;
}
System.out.print(negativeNumber+" "+String.format("%.1f",dou));
}
}
}
发表于 2023-06-08 16:49:02
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import java.util.*;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
// 注意 hasNext 和 hasNextLine 的区别
ArrayList<Integer> list=new ArrayList<>();
int n=in.nextInt();
int sum=0;
for(int i=0;i<n;i++){
Integer tmp=Integer.valueOf(in.next());
if(tmp<0){
sum++;
}else if(tmp>0){
list.add(tmp);
}
}
Double result=0.0;
for(int i=0;i<list.size();i++){
result+=list.get(i);
}
if(list.size()==0){
System.out.print(sum+" "+0.0);
}else{
result=result/list.size();
System.out.print(sum+" "+String.format("%.1f",result));
}
}
}
发表于 2023-06-07 09:37:02
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public static void main(String[] args) {
Scanner in = new Scanner(System.in);
// 注意 hasNext 和 hasNextLine 的区别
while (in.hasNextInt()) { // 注意 while 处理多个 case
int n = in.nextInt();
int zCount = 0;
int zNum = 0;
int fNum = 0;
for(int i=0;i<n;i++){
int num = in.nextInt();
if(num>0){
zNum++;
zCount+=num;
}else if(num<0){
fNum++;
}
}
double dd = zNum==0?0.0:Math.round((double)(zCount*10)/(double)zNum)/10.0;//要把两个相除的数用(double)包起来， 否则丧失精度;保存两位小数用这个DecimalFormat df =new DecimalFormat("#####0.00");df.format(c);
System.out.print(fNum + " " +dd);
}
}
发表于 2023-04-20 21:13:07
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Main {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String str;
while((str=br.readLine())!=null){
int cou=Integer.parseInt(str);
int[] dd=new int[cou];
String[] strArr=br.readLine().split(" ");
for(int i=0;i<cou;i++){
dd[i]=Integer.parseInt(strArr[i]);
}
int fu=0;
double sum=0.0;
int lin=0;
for(int i=0;i<cou;i++){
if(dd[i]<0){
fu++;
continue;
}else if(dd[i]==0){
lin++;
continue;
}
sum+=dd[i];
}
if(cou-fu-lin==0){
System.out.println(fu+" "+"0.0");
}else{
double s=sum/(cou-fu-lin);
//
System.out.println(fu+" "+String.format("%.1f",s));
}
}
}
}
发表于 2022-08-02 14:42:54
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import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int length = scanner.nextInt();
int[] ar = new int[length];
for (int i = 0; i < length; i++) {
ar[i] = scanner.nextInt();
}
int counts_=0;
int counts=0;int sum=0;
for (int i = 0; i < length; i++)
{
if(ar[i]>0) {sum+=ar[i];counts+=1;}
if(ar[i]<0) counts_+=1;
}
double avg= Math.round(sum*1.0/counts*10)*1.0/10;
System.out.println(counts_+" "+avg);
}
}
发表于 2022-07-26 05:25:17
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import java.util.*;
import java.util.stream.Collectors;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
List<Integer> list = new ArrayList();
while (sc.hasNext()) {
list.add(sc.nextInt());
}
List<Integer> negative = list.stream().filter(x->x < 0)
.collect(Collectors.toList());
int count = negative.size();
List<Integer> positive = list.stream().filter(x->x > 0)
.collect(Collectors.toList());
long sum = positive.stream().mapToInt(x->x).sum();
double size = positive.size();
double average = 0.0d;
if (size > 0) {
average = sum / size;
}
System.out.println(String.format("%d %.1f", count, average));
}
}
import java.util.stream.Collectors;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
List<Integer> list = new ArrayList();
while (sc.hasNext()) {
list.add(sc.nextInt());
}
List<Integer> negative = list.stream().filter(x->x < 0)
.collect(Collectors.toList());
int count = negative.size();
List<Integer> positive = list.stream().filter(x->x > 0)
.collect(Collectors.toList());
long sum = positive.stream().mapToInt(x->x).sum();
double size = positive.size();
double average = 0.0d;
if (size > 0) {
average = sum / size;
}
System.out.println(String.format("%d %.1f", count, average));
}
}
发表于 2022-07-10 12:44:31
回复(0)
import java.util.*;
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int nextInt = scanner.nextInt();
int fushu = 0;
List<Integer> list = new ArrayList<>();
for (int i = 0; i < nextInt; i++) {
String next = scanner.next();
int num = Integer.parseInt(next);
if (num == 0)
continue;
if (num < 0) {
++fushu;
} else {
list.add(num);
}
}
System.out.print(fushu + " ");
int size = list.size();
int sum = 0;
if (size == 0) {
System.out.println(0.0);
} else {
for (Integer integer : list) {
sum += integer;
}
System.out.println(String.format("%.1f", sum * 1.0 / size));
}
}
}
// 注意：正数平均值如果都为0，字符串转换是NAN，需要提前输出，避免都为0还执行，见用例2
public class Main {public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int nextInt = scanner.nextInt();
int fushu = 0;
List<Integer> list = new ArrayList<>();
for (int i = 0; i < nextInt; i++) {
String next = scanner.next();
int num = Integer.parseInt(next);
if (num == 0)
continue;
if (num < 0) {
++fushu;
} else {
list.add(num);
}
}
System.out.print(fushu + " ");
int size = list.size();
int sum = 0;
if (size == 0) {
System.out.println(0.0);
} else {
for (Integer integer : list) {
sum += integer;
}
System.out.println(String.format("%.1f", sum * 1.0 / size));
}
}
}
发表于 2022-06-16 14:52:30
回复(0)
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (sc.hasNext()) {
int n = sc.nextInt();
int[] ints = new int[n];
for (int i = 0; i < ints.length; i++) {
ints[i] = sc.nextInt();
}
solution(ints);
}
}
private static void solution(int[] ints) {
double avg = 0.0;
int countB = 0;
int countS = 0;
for (int anInt : ints) {
if (anInt > 0) {
avg += anInt;
countB++;
} else if (anInt < 0) {
countS++;
}
}
if (countB > 0) {
avg /= countB;
}
String avg1 = String.format("%.1f", avg);
System.out.println(countS + " " + avg1);
}
}
发表于 2022-03-28 13:34:31
回复(0)
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (sc.hasNext()) {
int n = sc.nextInt();
int s1 = 0,s2 = 0;
double sum = 0.0;
int[] arr = new int[n];
for(int i = 0;i<n;i++){
arr[i] = sc.nextInt();
}
for(int i = 0;i<arr.length;i++){
if(arr[i] <0)
s1++;
if(arr[i] >0){
sum= sum+arr[i];
s2++;
}
}
if(sum==0){
System.out.print(s1+" "+"0.0"+"\n");
}else if(sum!=0){
System.out.print(s1+" "+String.format("%.1f",sum/s2)+"\n");
}
}
}
发表于 2022-03-12 23:49:20
回复(0)
import java.text.DecimalFormat;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (sc.hasNext()) {
int n = sc.nextInt();
int countFu = 0;
int countZh = 0;
double sum = 0.0;
for (int i = 0; i < n; i++) {
int in = sc.nextInt();
if (in < 0) {
countFu++;
}
if (in > 0) {
countZh++;
sum = sum + in;
}
}
System.out.println(countFu + " " + (countZh > 0? new DecimalFormat("######0.0").format(sum/countZh) : 0.0));
}
}
}
发表于 2021-12-27 16:44:32
回复(0)
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while(sc.hasNextInt()){
int n = sc.nextInt();
//负数个数
int negCount = 0;
//正数之和
int pos = 0;
//正数个数
int posCount = 0;
for(int i = 0; i < n; i++){
int num = sc.nextInt();
if(num < 0){
negCount++;
}
if(num > 0){
pos += num;
posCount++;
}
}
System.out.printf("%d %.1f\n",negCount,(double)pos/posCount);
}
}
}
发表于 2021-12-01 15:55:36
回复(0)
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (sc.hasNext()) {
int n = sc.nextInt();
int [] a = new int[n];
int c1 = 0;
int c2 = 0;
double sum = 0;
for(int i = 0; i < n; i++){
a[i] = sc.nextInt();
if(a[i] < 0){
c1 ++;
}
if(a[i] > 0){
c2 ++;
sum += a[i];
}
}
double average = sum / c2;
System.out.printf("%d %.1f\n", c1, average);
}
}
}
发表于 2021-09-16 16:40:36
回复(0)
import java.util.*;
public class Main{
public static void main(String []args){
Scanner scan=new Scanner(System.in);
while(scan.hasNext()){
int n=scan.nextInt();
int zheng=0,fu=0;
float sum=0;
while(n>0){
int x=scan.nextInt();
if(x<0){
fu++;
}else if(x>0){
sum+=x;
zheng++;
}
n--;
}
System.out.printf("%d %.1f\n",fu,sum/zheng);
}
}
}
发表于 2021-09-02 14:01:43
回复(0)
//一种简单的做法
import java.util.Scanner;
public class Main{
public static void main(String[] args){
Scanner s = new Scanner(System.in);
while(s.hasNext()){
int n = s.nextInt();
int[] arr = new int[n];
int countf = 0;
int countz = 0;
double sum = 0.0;
double p = 0.0;
for(int i = 0;i < n;i++){
arr[i] = s.nextInt();
if(arr[i] < 0){
countf++;
}
if(arr[i] > 0){
countz++;
sum += arr[i];
p = (double)(sum / countz);
}
}
System.out.println(countf + " " + String.format("%.1f",p));
}
}
}
发表于 2021-08-03 12:08:19
回复(0)
import java.util.Scanner;
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
while(sc.hasNext()){
int num = sc.nextInt();
int[] arr = new int[num];
boolean flag = true;
int count = 0;
while(sc.hasNext()&&flag){
for(int i = 0 ; i < arr.length; i++){
arr[i] = sc.nextInt();
count++;
}
if(count==num){
flag = false;
}
}
float count1 = 0;
int count2 = 0;
float sum = 0;
for(int i = 0; i < arr.length; i++){
if(arr[i]>0){
count1++;
sum+=arr[i];
}
if(arr[i]<0){
count2++;
}
}
System.out.print(count2+" ");
System.out.printf("%.1f\n",sum/count1);
}
}
}
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
while(sc.hasNext()){
int num = sc.nextInt();
int[] arr = new int[num];
boolean flag = true;
int count = 0;
while(sc.hasNext()&&flag){
for(int i = 0 ; i < arr.length; i++){
arr[i] = sc.nextInt();
count++;
}
if(count==num){
flag = false;
}
}
float count1 = 0;
int count2 = 0;
float sum = 0;
for(int i = 0; i < arr.length; i++){
if(arr[i]>0){
count1++;
sum+=arr[i];
}
if(arr[i]<0){
count2++;
}
}
System.out.print(count2+" ");
System.out.printf("%.1f\n",sum/count1);
}
}
}
发表于 2021-06-12 11:35:43
回复(0)
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