Compile Time Error - Cannot Invoke Read On Primitive Data Type Int

I have a code in which I am reading input from System.in and Destination is some where else

Here is my code

File file=new File("D:/output.txt");
OutputStream os=new java.io.FileOutputStream(file);
Scanner scanner=new Scanner(System.in);
System.out.println("Enter Data to write on File");
String text=scanner.nextLine();
int c=Integer.parseInt(text);
int a;
while((a=c.read())!=-1)
os.write(a);
System.out.println("File Written is Successful");

In the line while((a=c.read())!=-1)

a compile time error is shown "cannot invoke read on primitive data type int"

Where I am going wrong?