javac silently accepts illegal integer literals

Name: laC46010 Date: 04/15/97



Java compiler (JDK1.0.2 - JDK1.1.2) accepts integer literals
in interval 49000000000..100930000000 though spec allows only
integer literals less than 2147483648.
What especially bad is that compiler silently convert them into
some wrong values, for example 100000000000 into 1215752192.

JLS (3.10.1 Integer Literals, p.21) says:

"A compile-time error occurs if a decimal literal of type int is larger
than 2147483648 (), or if the literal 2147483648 appears anywhere other
than as the operand of the unary - operator, or if a hexadecimal or
octal int literal does not fit in 32 bits."


--------------------------------------
public class expr05601 {
public static void main(String args[]) {
//int i1 = 2147483648;
//int i2 = 2150000000;
int x = 49000000000;
int i3 = 100000000000;
int y = 100930000000;
//int i4 =1000000000000;
System.out.println(i3);
}
}
--------------------------------------

> /export/ld13/java/dest/jdk1.1.2/solaris/bin/javac expr05601.java
> /export/ld13/java/dest/jdk1.1.2/solaris/bin/java expr05601
1215752192
> /export/ld13/java/dest/jdk1.1.2/solaris/bin/java -version
java version "1.1.2"

After uncommenting commented lines, javac correctly reports error messages
about illegal literals 2147483648, 2150000000, 1000000000000 but again
it doesn't say anything about 49000000000, 100000000000, 100930000000

> /export/ld13/java/dest/jdk1.1.2/solaris/bin/javac expr05601.java
expr05601.java:3: Numeric overflow.
int i1 = 2147483648;
^
expr05601.java:4: Numeric overflow.
int i2 = 2150000000;
^
expr05601.java:8: Numeric overflow.
int i4 =1000000000000;
^
3 errors



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