我目前正在开发一个获取用户输入文件的程序,在每一行上添加两个数字,然后将答案输出到用户自制的输出文件和Netbeans中的运行屏幕。我似乎只能做第一行,并且,在打印时,行中的第二个数字甚至不显示。
代码:
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;
public class Sums {
public static void main(String[] args) throws IOException {
// Scanner for user input
Scanner user = new Scanner(System.in);
String inputFileName, outputFileName;
// prepare the input file
System.out.print("Input File Name: ");
inputFileName = user.nextLine().trim();
File input = new File(inputFileName);
Scanner scan = new Scanner(input);
// prepare the output file
System.out.print("Output File Name: ");
outputFileName = user.nextLine().trim();
// processing loop
try (PrintWriter output = new PrintWriter(outputFileName)) {
// processing loop
{
while (scan.hasNext()) {
int Numbers = scan.nextInt();
double sum = 0;
for (int i = 0; i < Numbers; i++) {
sum += scan.nextDouble();
}
double total = (((sum + 1) * sum) / (2));
output.println("Sum From " + Numbers + "To " + Numbers + "is " + total);
}
}
}
}
}
答案 0 :(得分:0)
我尝试了你的代码,它似乎对我有用。
这是我的输入文件内容:
2 1 2
2 3 4
这是输出文件内容:
从2到2的总和是6.0
总和从2到2是28.0
我不太确定这是不是你想要的。
ADD:
代码段:
while (scan.hasNext()) {
int Numbers = scan.nextInt();
String numberStr = "" + Numbers;
double sum = 0;
for (int i = 0; i < Numbers; i++) {
double d = scan.nextDouble();
sum += d;
numberStr += ", " + d;
}
double total = (((sum + 1) * sum) / (2));
output.println("Sum From " + numberStr +" is " + total);
}
输入是:
2 1 2
输出结果为:
总和从2,1.0,2.0是6.0
答案 1 :(得分:0)
您可以创建PrintWriter以打印到用户输出的文件。然后在scanner.hasNextInt()中搜索原始文件。添加下两个整数并使用“println()”
将它们打印到文件中function msgRequest() {
return $.post('/admin/notify/messages', {
"_token": "{{ csrf_token() }}"
}).promise()
}
function readAll(messages) {
return $.when.apply(null, $.map(messages, function(index, message) {
return $.post('/admin/notify/read', {
notify_id: message.id,
"_token": "{{ csrf_token() }}"
}).promise()
}));
}
function getUnread() {
return $.post('/admin/notify/unread', {
"_token": "{{ csrf_token() }}"
}, function(unread) {
$('#unread').text(unread);
return unread
});
}
$('#readall').click(function() {
msgRequest().then(readAll).then(getUnread)
});
我的输入文件看起来像这样......
public static void main(String[] args) throws FileNotFoundException {
PrintWriter printwriter = new PrintWriter("newfile.txt");
File file = new File("file.txt");
Scanner scanner = new Scanner(file);
int sum = 0;
System.out.println(scanner.hasNextInt());
while(scanner.hasNextInt()){
printwriter.println(scanner.nextInt() + scanner.nextInt());
}
printwriter.close();
}
我的输出文件看起来像这样......
1 2
4 2
2 4
6 4
6 7
2 3