Ⅰ java.編程者如何判斷用戶輸入的函數呢
通過分析用戶的輸入，得出用戶輸入的函數，這是一個語法解析的過程。
內置有一些關鍵字，+-*/ ^（乘方），sin cos tan ln e，等，自變數不妨統一要求為x，其餘需要你自己寫代碼來實現了。
Ⅱ 如何用命令行運行java程序及輸入main函數參數的輸入
main函數也可以帶參數。帶參數main函數的定義格式如下：
void main(int argc, char *argv[])
{
... ...
}
argc和argv是main函數的形式參數。這兩個形式參數的類型是系統規定的。如果main函數要帶參數，就是這兩個類型的參數；否則main函數就沒有參數。變數名稱argc和argv是常規的名稱，當然也可以換成其他名稱。
那麼，實際參數是如何傳遞給main函數的argc和argv的呢？我們知道，C程序在編譯和鏈接後，都生成一個exe文件，執行該exe文件時，可以直接執行；也可以在命令行下帶參數執行，命令行執行的形式為：
可執行文件名稱 參數1 參數2 ... ... 參數n
執行文件名稱和參數、參數之間均使用空格隔開。例如，在linux下運行程序./a.out 1 2 ，可執行文件名稱為./a.out，參數1為字元串1，參數2為2。
如果按照這種方法執行，命令行字元串將作為實際參數傳遞給main函數。具體為：
(1) 可執行文件名稱和所有參數的個數之和傳遞給argc；所以上面的argc=3
(2) 可執行文件名稱（包括路徑名稱）作為一個字元串，首地址被賦給argv[0]，參數1也作為一個字元串，首地址被賦給argv[1]，... ...依次類推。
Ⅲ java的輸入函數是什麼怎麼使用忘高手指點
用java.util.Scanner類，代碼如下
import java.util.*;
public class Scan {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int i = scanner.nextInt();
System.out.print(i);
}
}
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