输入 n 个整型数，统计其中的负数个数并求所有非负数的平均值，结果保留一位小数，如果没有非负数，则平均值为0
本题有多组输入数据，输入到文件末尾。
数据范围：
，其中每个数都满足 
[编程题]记负均正II
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
int countA = 0;
int countB = 0;
int sum = 0;
while (in.hasNextInt()) { // 注意 while 处理多个 case
int a = in.nextInt();
if (a < 0) {
countA += 1;
} else {
countB += 1;
sum += a;
}
}
double d = countB == 0 ? 0.0 : (double)sum / countB;
System.out.println(countA);
System.out.println(String.format("%.1f", d));
}
}
发表于 2024-09-11 14:53:26
回复(0)
import java.util.ArrayList;
import java.util.List;
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
int fcount = 0;
int zcount= 0;
int sum = 0;
while (in.hasNextInt()) { // 注意 while 处理多个 case
int a = in.nextInt();
if(a>0){
sum += a;
zcount++;
}else{
fcount++;
}
}
double d = zcount ==0 ? 0.0 :(double)sum/ zcount;
System.out.println(fcount);
System.out.println(String.format("%.1f",d));
}
}
发表于 2023-08-28 14:14:39
回复(0)
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
int sum = 0;
int countFu = 0;
int countNoFu = 0;
int num;
while (in.hasNextInt()) { // 注意 while 处理多个 case
num = in.nextInt();
if (num < 0) {
countFu++;
} else {
sum += num;
countNoFu++;
}
}
double a = countNoFu == 0.0 ? 0.0 : 1.0 * sum / countNoFu ;
System.out.println(countFu);
System.out.println(String.format("%.1f", a));
}
}
发表于 2023-07-01 11:25:20
回复(0)
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
int positive = 0;
int negative = 0;
int sum = 0;
while (in.hasNext()) {
int n = in.nextInt();
if (n > 0) {
sum += n;
positive ++;
} else {
negative++;
}
}
double d = positive == 0 ? 0.0 : (double) sum / positive;
System.out.println(negative);
System.out.println(String.format("%.1f", d));
}
}
发表于 2023-06-09 11:06:27
回复(1)
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 sum=0;
while(in.hasNext()){
int num=in.nextInt();
if(num<0){
sum++;
}else if(num>0){
list.add(num);
}
}
Double result=0.0;
for(int i=0;i<list.size();i++){
result+=list.get(i);
}
result=result/list.size();
System.out.println(sum);
if(list.size()==0){
System.out.print(0.0);
return;
}
System.out.print(String.format("%.1f",result));
}
}
发表于 2023-06-07 11:17:26
回复(0)
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
// 注意 hasNext 和 hasNextLine 的区别
long ffTotal = 0;
long ffCount = 0;
long n = 0;
while (in.hasNextLong()) { // 注意 while 处理多个 case
long b = in.nextLong();
if(b>=0){
ffTotal+=b;
ffCount++;
}
n++;
}
System.out.println(n-ffCount);
if(ffCount==0){
System.out.println(0.0);
}else{
double p = Math.round((double)ffTotal*10/(double)ffCount)/10.0; System.out.println(p);
}
}
发表于 2023-04-20 21:46:52
回复(0)
import java.util.Scanner;
import java.lang.Integer;
import java.util.ArrayList;
public class Main {
public static void main(String[] args) {
test();
}
public static void test() {
Scanner sc = new Scanner(System.in);
ArrayList<Integer> list = new ArrayList<>();
int count = 0;
int sum = 0;
double avg=0;
String s = sc.nextLine();
String[] split = s.split(" ");
for (int i = 0; i < split.length; i++) {
int num = Integer.valueOf((split[i]));
if (num < 0) {
++count;
continue;
}
list.add(num);
}
System.out.println(count);
if (list.size() > 0) {
for (int i = 0; i < list.size(); i++) {
sum += list.get(i);
}
avg= (double)sum / (list.size());
System.out.printf("%.1f",avg);
} else {
System.out.println(0.0);
}
sc.close();
}
} 看来是多行的题目,这么做不对?
发表于 2022-08-28 22:11:14
回复(0)
import java.util.*;
public class Main {
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
int positiveCnt = 0;
int negativeCnt = 0;
int sum = 0;
while(sc.hasNext()){
int n = sc.nextInt();
if(n>0){
sum += n;
positiveCnt++;
}else{
negativeCnt++;
}
}
double res = positiveCnt==0 ? 0.0:sum*1.0/positiveCnt;
System.out.println(negativeCnt+"\n"+String.format("%.1f",res));
}
}
发表于 2022-08-03 16:19:51
回复(0)
import java.util.*;
public class Main{
public static void main(String[]args){
Scanner sc = new Scanner(System.in);
int positiveCnt = 0;
int negativeCnt = 0;
int sum = 0;
while(sc.hasNext()){
int n = sc.nextInt();
if(n>0){
sum += n;
positiveCnt++;
}else{
negativeCnt++;
}
}
double res = positiveCnt==0 ? 0.0:sum*1.0/positiveCnt;
System.out.println(negativeCnt+"\n"+String.format("%.1f",res));
}
}
发表于 2022-07-12 18:56:16
回复(0)
import java.util.*;
import java.math.*;
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
float count1 = 0;
int count2 = 0;
float sum = 0;
while (sc.hasNextInt()){
int cur = sc.nextInt();
if (cur >= 0){
count1++;
sum += cur;
}else{
count2++;
}
}
System.out.println(count2);
BigDecimal val1 = BigDecimal.valueOf(sum);
BigDecimal val2 = BigDecimal.valueOf(count1);
System.out.println(val2.floatValue() == 0 ? 0.0f : val1.divide(val2, 1, RoundingMode.HALF_UP).floatValue());
}
}
发表于 2022-07-08 23:57:39
回复(0)
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
while (in.hasNext()) {
int numOfNeg = 0;
int numOfNonNeg = 0;
double sumOfNoneNeg = 0.0;
while (in.hasNextDouble()) {
double x = in.nextDouble();
if (x < 0.0) {
numOfNeg++;
} else {
sumOfNoneNeg += x;
numOfNonNeg++;
}
}
System.out.println(numOfNeg);
if (numOfNonNeg == 0) {
System.out.println(0.0);
} else {
System.out.println(String.format("%.1f", sumOfNoneNeg / (double)numOfNonNeg));
}
}
}
}
发表于 2022-05-30 14:13:51
回复(0)
import java.util.*;
public class Main{
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
float sum=0;
float count1=0;
int count2=0;
while(sc.hasNextInt()){
int n=sc.nextInt();
if(n>=0){
sum+=n;
count1++;
}else{
count2++;
}
}
float avg=sum/count1;
System.out.println(count2);
if(count1>0){//存在没有整数的情况，如果还输出sum/count1,0/0是非法的
System.out.print(String.format("%.1f",avg));
//保留一位小数的正确输出方式
}else{
System.out.print(0.0);
}
}
}
public class Main{
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
float sum=0;
float count1=0;
int count2=0;
while(sc.hasNextInt()){
int n=sc.nextInt();
if(n>=0){
sum+=n;
count1++;
}else{
count2++;
}
}
float avg=sum/count1;
System.out.println(count2);
if(count1>0){//存在没有整数的情况，如果还输出sum/count1,0/0是非法的
System.out.print(String.format("%.1f",avg));
//保留一位小数的正确输出方式
}else{
System.out.print(0.0);
}
}
}
发表于 2022-04-01 16:19:13
回复(0)
出这题有毛病，又没有说输入多少行，怎么知道输入结束？以上通过的代码在ide平台根本无法运行。不知道多少行就无法跳出循环去统计
发表于 2022-02-25 15:16:15
回复(2)
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
//非负数数和
int pos = 0;
//非负数个数
int posCount = 0;
//负数个属于
int negCount = 0;
while(sc.hasNextInt()){
int n = sc.nextInt();
if(n >= 0){
pos += n;
posCount ++ ;
}
if(n < 0){
negCount++;
}
}
System.out.println(negCount);
if(posCount==0){
System.out.println(0.0);
}else{
System.out.printf("%.1f",(double)pos/posCount);
}
}
}
发表于 2021-12-02 00:04:12
回复(0)
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int count = 0;
int count2 = 0;
int total = 0;
while (sc.hasNext()) {
int temp = sc.nextInt();
if (temp >= 0) {
total += temp;
count2 ++;
} else {
count ++;
}
}
System.out.println(count);
if (count2 == 0) {
System.out.println(0.0);
} else {
System.out.printf("%.1f%n", (double) total / count2);
}
}
}
发表于 2021-11-08 18:15:03
回复(0)
...... int countfu = 0; int countsum = 0; float countzeng = 0; ...... float f = countsum/countzeng; ......
最开始看到输出结果愣了一下，测试是.1，我是.0
然后想起来最开始把计正数与求正数和都设置为int型变量了。
两个int相除结果还是int型，转换float也没有小数点后数字的。
发表于 2021-10-28 22:25:16
回复(0)
import java.util.Scanner;
//按题意计数和求平均
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
double average=0, sum=0;
int countNegative=0, countPositive=0;
int num=0;
while(sc.hasNext()){
num = sc.nextInt();
if(num<0) countNegative++;
else{
countPositive++;
sum += num;
}
}
System.out.println(countNegative);
if(countPositive>0) average = sum/countPositive;
System.out.printf("%.1f", average);
}
}
发表于 2021-08-17 15:43:02
回复(0)
import java.util.*;
public class Main{
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
int countF=0,countZ=0,sum=0;
while(sc.hasNext()){
int n=sc.nextInt();
if(n<0){
countF++;
}
else if(n>0){
countZ++;
sum+=n;
}
}
System.out.println(countF);
if(countZ==0)
System.out.println(0.0);
else
System.out.println(String.format("%.1f",(double)sum/countZ));
}
}
发表于 2021-07-15 00:24:42
回复(0)
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