GENERAL: VALID VALUE ASSIGNMENT CREATES WARNING

Information in this article applies to:

• ANSI C Compiler

QUESTION

I use the following assignment in my code:

unsigned long v = 2147483648;

This assignment creates a compiler warning that I cannot understand:

warning:  #1134-D: literal treated as "long long"

ANSWER

The warning indicates that your expression exceedes the value range for long which is -2147483648 .. +2147483647. The ANSI standard explicitly requests that plain decimal numbers are considered as signed long constants. Another reason for this warning might be that the expression really exceeds the value range.

For plain decimal values you may use the prefix U to avoid the warning.

Example:

unsigned long v = 2147483648U;

SEE ALSO

• GENERAL: #DEFINES WITH ARITHMETIC DON'T WORK
• GENERAL: #DEFINE GENERATES WRONG RESULTS
• GENERAL: MULTIPLYING TWO INTS GIVES INCORRECT RESULT
• GENERAL: LOGICAL NOT ('~') GIVES INCORRECT RESULTS
• ARM: WRONG RESULT WITH BINARY NOT AND UNSIGNED CHAR

Last Reviewed: Thursday, November 22, 2007