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int and char

 
Ranch Hand
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Hello,
ch is an integer variable. Why is it possible to say ch != 'x'? ch is an int and 'x' is a char.
import java.io.*;
class MyInputStream1 {
public static void main (String args[ ]) throws IOException {
int ch;
do {
ch = System.in.read();
} while (ch != 'x');
System.out.println("Input was x; Programm termination");
}
}
 
Ranch Hand
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Because thew char will be promotied to an int and then the comparison will be done. You can check out the API for the promotion rules for more details.
 
Greenhorn
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Hi Thomas;
Remember one thumb rule while dealing with any one of these JAVA primitives
*byte
*short
*char
when ever you perform any opertation on these types they are promoted to int or the other superior type u r assigning to.
 
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