var fun = function() {
  console.log("rrrr");
  exec('CALL hai.exe', function(err, data) {

    console.log(err)
    console.log(data.toString());
  });
}
fun();

var exec = require('child_process').execFile;

var fun =function(){
   console.log("fun() start");
   exec('HelloJithin.exe', function(err, data) {
        console.log(err)
        console.log(data.toString());
    });
}
fun();

var exec = require('child_process').execFile;
/**
 * Function to execute exe
 * @param {string} fileName The name of the executable file to run.
 * @param {string[]} params List of string arguments.
 * @param {string} path Current working directory of the child process.
 */
function execute(fileName, params, path) {
    let promise = new Promise((resolve, reject) => {
        exec(fileName, params, { cwd: path }, (err, data) => {
            if (err) reject(err);
            else resolve(data);
        });

    });
    return promise;
}