Important Note : There is a difference between
x+=a and x = x+a.
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Consider the following code.
int x;
x = x+ 0.1;
// The above code generates an error that
// explicit type conversion is required.
// Right, anybody can tell this.
// Now Consider this for a difference.
int x;
x+=0.1;
//It doesn't generate an error.
// Why ?
The variable is not been combined with another int type. Since the first is using both int and double types the system assumes you made the mistake, and that's why it returns the error:) (If this comment was disrespectful, please report it.)
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6/5/2001 7:23:16 AM: 
