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+.TH ABS 2
+.SH NAME
+abs, labs \- integer absolute values
+.SH SYNOPSIS
+.B #include <u.h>
+.br
+.B #include <libc.h>
+.PP
+.B
+int abs(int a)
+.PP
+.B
+long labs(long a)
+.SH DESCRIPTION
+.I Abs
+returns
+the absolute value of integer
+.IR a ,
+and
+.I labs
+does the same for a long.
+.SH SOURCE
+.B /sys/src/libc/port/abs.c
+.SH SEE ALSO
+.IR floor (2)
+for
+.I fabs
+.SH DIAGNOSTICS
+.I Abs
+and
+.I labs
+return
+the most negative integer or long when the true result is unrepresentable.