When i tyr this, it gives me a syntax error...i tried removing quotes,removing spaces,replacing -eq with '='.. Can somebody suggest that is the problem?
if ]; then (4 Replies)
Hi,
I am trying to compile a program (not coded by me), and i'm getting this error:
203: error: lvalue required as left operand of assignment
As you may be guessing, the program doesn't compile, the line number 203 is the following:
... (2 Replies)
Hey all. I've been working on some fun with C and decided to write a Rock Paper Scissors game. The problem is, that when I try to compile the file, it gives "lvalue required as left operand of assignment" error. The error line is here:
for ((point1=0 && point2=0); ((point1=3) || (point2=3));... (4 Replies)
Hi,
This code was originally to print a sine function table. I modified it to print a tangent function table. I got an "lvalue" error which I can't solve...Any hint on why am I getting this error?
Here is the code:
// sintab.cpp
// Creates a tangent function table
#include <iostream>... (2 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
Create a script that displays output with a specific parameter.
For example, for a script called score... (1 Reply)
1. After trying to compile code error is given Lvalue required as left operand of assignment.
2. Relevant commands, code, scripts, algorithms:
if , else if
3. The attempts at a solution (include all code and scripts):
/*
File: incircles.cpp
Created by: James Selhorst
... (2 Replies)
Does anyone know how this line in bash works?
local gotbase= force= nicelevel corelimit
local pid base= user= nice= bg= pid_file=
local cgroup=
These lines are part of the daemon function inside the "functions" file at /etc/init.d in RH. (3 Replies)
Hi I'm new to shell programming. How do I extract the size of an operand in a simple instruction in a C program? Lets say there is an addition a+b somewhere in a C code where a and b are integers. How to extract the size of a & b in bits? Is there something called intermediate code before an... (4 Replies)
When I create a bootable Linux distro installation USB drive, I use this command: sudo dd if=/Path/to/linux_distro.iso of=/dev/rdisk<disk number>
bs=<number of bytes>
When I look it up, I've seen variations of people choosing 4M, and I think 8M, 2M, and maybe even 1M.
If I leave the operand... (4 Replies)
Discussion started by: Quenz
4 Replies
LEARN ABOUT NETBSD
atan2
ATAN2(3) BSD Library Functions Manual ATAN2(3)NAME
atan2, atan2f -- arc tangent function of two variables
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
atan2(double y, double x);
float
atan2f(float y, float x);
DESCRIPTION
The atan2() and atan2f() functions compute the principal value of the arc tangent of y/x, using the signs of both arguments to determine the
quadrant of the return value.
RETURN VALUES
The atan2() function, if successful, returns the arc tangent of y/x in the range [-pi, +pi] radians. If both x and y are zero, the global
variable errno is set to EDOM. On the VAX:
atan2(y, x) := atan(y/x) if x > 0,
sign(y)*(pi - atan(|y/x|)) if x < 0,
0 if x = y = 0, or
sign(y)*pi/2 if x = 0 y.
NOTES
The function atan2() defines "if x > 0," atan2(0, 0) = 0 on a VAX despite that previously atan2(0, 0) may have generated an error message.
The reasons for assigning a value to atan2(0, 0) are these:
1. Programs that test arguments to avoid computing atan2(0, 0) must be indifferent to its value. Programs that require it to be
invalid are vulnerable to diverse reactions to that invalidity on diverse computer systems.
2. The atan2() function is used mostly to convert from rectangular (x,y) to polar (r,theta) coordinates that must satisfy x = r*cos
theta and y = r*sin theta. These equations are satisfied when (x=0,y=0) is mapped to (r=0,theta=0) on a VAX. In general, conver-
sions to polar coordinates should be computed thus:
r := hypot(x,y); ... := sqrt(x*x+y*y)
theta := atan2(y,x).
3. The foregoing formulas need not be altered to cope in a reasonable way with signed zeros and infinities on a machine that conforms
to IEEE 754; the versions of hypot(3) and atan2() provided for such a machine are designed to handle all cases. That is why
atan2(+-0, -0) = +-pi for instance. In general the formulas above are equivalent to these:
r := sqrt(x*x+y*y); if r = 0 then x := copysign(1,x);
SEE ALSO acos(3), asin(3), atan(3), cos(3), cosh(3), math(3), sin(3), sinh(3), tan(3), tanh(3)STANDARDS
The atan2() function conforms to ANSI X3.159-1989 (``ANSI C89'').
BSD May 2, 1991 BSD