java - Run execute file in Runtime.exec() and get user input -

how run c execute file user input in java runtime().exec(). without user input in c program execute file runs in runtime().exec():

for example: below c program if n predefined , it's execute file runs in java runtime()...if n user input how run execute file?

#include <stdio.h> #include <time.h>     #include <unistd.h> int main() {    setbuf(stdout, null); //set buffer null    int i,n;    scanf("%d",&n);        for(i=0;i<=n;i++)    {     printf("%d\n",i);     sleep(1); //delay    } } //main 

java code ....

import java.io.*;  import java.lang.runtime; import java.lang.*; import java.io.file; import java.util.timer; import java.util.timertask;  public class run3 {  public static void main(string[] args)  {  try  {  string[] cmd = {"file path"};  process p = java.lang.runtime.getruntime().exec(cmd);  string s;  bufferedreader stdinput = new bufferedreader(new                                            inputstreamreader(p.getinputstream()));  bufferedreader stderror = new bufferedreader(new                                             inputstreamreader(p.geterrorstream()));      while ((s = stdinput.readline()) != null)     {    system.out.println(s);    }            system.out.println("done.");    }//try   catch (ioexception ex)    { ex.printstacktrace();   }  } //void } //main     

there various ways this, depending on trying achieve:

• the simplest way pass n command line argument.

• you have c program read n standard input ... , write java side using process object's getoutputstream method.

• you have c program open "/dev/console" or "/dev/tty" , read n there. on windows believe can in other ways.

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ok. given that, need call p.getinputstream(), write input stream, , close ... before attempting read command's output.