.TH FLOOR 3M .SH NAME fabs, floor, ceil \- absolute value, floor, ceiling functions .SH SYNOPSIS .B #include <math.h> .PP .B double floor(x) .br .B double x; .PP .B double ceil(x) .br .B double x; .PP .B double fabs(x) .br .B double(x); .SH DESCRIPTION .I Fabs returns the absolute value .RI | \|x\| |. .PP .I Floor returns the largest integer not greater than .IR x . .PP .I Ceil returns the smallest integer not less than .IR x . .SH SEE ALSO abs(3)