How do I fix this I dont seem to find anything wrong?
this is the code
https://preview.redd.it/76inlvppte681.png?width=835&format=png&auto=webp&s=be909b275d65a27d8d8dd03a980e51386e5b5c9d
I am trying to make a calculator so I obviously need calculations, I made variables for numbers to replace using set /p %addnum1% as my first variable and set /p %addnum2% as my second variable, I use set /a addans=%addnum1%+%addnum2% as my equation but when I load it is says "Missing Operand". What am I doing wrong?
My code:
if (cond== 'RGS') || (cond== 'Veh')
disp('Analysing...')
else
disp('Please type RGS or Veh if you want to continue the analysis!')
end
ERROR:Operands to the logical and (&&) and or (||) operators must be convertible to logical scalar values.
How am I supposed to write 'OR', 'AND' etc. in if statements?
Hi, I was trying to make a procedural generation algorithm for my Rogue-like game challenge when I got this error:
func find_mst(nodes):
var path = AStar.new()
path.add_point(path.get_available_point_id(), nodes.pop_front())
while nodes:
var min_dist = INF
var min_p = null
var p = null
for p1 in path.get_points():
p1 = path.get_point_position(p1)
for p2 in nodes:
# ERROR: Invalid operands 'Vector3' and 'float' in operator '<'
if p1.direction_to(p2) < min_dist:
min_dist = p1.direction_to(p2)
min_p = p2
p = p1
var n = path.get_available_point_id()
path.add_point(n, min_p)
path.connect_points(path.get_closest_point(p), n)
nodes.erase(min_p)
return path
I was using this tutorial, I know that its pretty outdated, but it really does explain well, thanks in advance
Someone I know is writing some custom AND/OR functions in a DSL, and they only allow 2 or more operands. I'm trying to convince them that 0 or 1 operands is also valid.
Can someone help me justify that?
First off, for some context:
I've been doing a lot of C# .NET the last several years and haven't really touched C++ since college, and I've been working through the Ray Tracer Challenge book in my spare time. Got to a part where I needed the PI constant. A quick Google search told me that in C++20 you can include <numbers> and PI is found in std::numbers::pi. Also found out that my project settings were set to C++14 instead of C++20. No problem, I changed it to C++20. I fixed a few warnings that popped up, no big deal. However, since making the switch to C++20 my Point * Matrix and Vector * Matrix operator overloads are not working and I'm seeing weird behavior. See below:
TEST_F(MatrixTest, MatrixScaling)
{
Matrix scaling = Matrix::Scale(2, 3, 4);
Point scaledPoint = p2 * scaling;
Vector scaledVector1 = v4 * scaling;
Matrix inversedScaleMatrix = scaling.Inverse();
Vector inversedScale = v4 * inversedScaleMatrix;
inversedScale = v4 * scaling.Inverse();
Point reflectedPointXAxis = Point(2, 3, 4) * Matrix::Scale(-1, 1,1);
}
On line 1 I am instantiating a scaling matrix which is a static method that returns a Matrix object. The following 4 lines are valid operations.
Lines 8 and 9 both throw "No operator matches these operands" error with the red squiggly under the *. Even though the operation immediately above it on lines 5 and 6 do the same thing, just in a more roundabout manner.
Why does using the result of the instance method directly not work when calling the same instance method and assigning it to an intermediate instance does work?
I have also found that removing the & symbol from the operator overload in Point.h gets rid of this error, but I'd rather not be passing matrices around by value millions of times a second. All of this functionality did not throw an error in C++14 btw. I'll also include the relevant bits of Point.h, Vector.h, and Matrix.h:
class Matrix {
private:
std::size_t size;
float* matrix;
const static bool FloatCompare(const float f1, const float f2);
public:
\* Other member methods \*
static Matrix Identity();
Matrix Inverse();
static Matrix Translate(const float x, const float y, const float z);
static Matrix Scale(const float x, const float y, const float z);
// Operator overloads.
Matrix& operator=(Matrix other);
bool operator==(const Matrix& other);
Matrix operatoTake the example if(a && b). Here, if a evaluates to false, b isn't considered, as it's useless to do so. You can use this trick to shorten checking for NULL, like writing if(ptr && *ptr == whatever) : if ptr == NULL, right-hand side of the operation isn't evaluated, and NULL isn't dereferenced. That's well and good.
What I'm wondering about is, does that trick work with other operations ? Say, 0 * b. As this will always equate 0, is b evaluated ? I'd like to know, as this could allow me to write something like int a = (ptr != NULL) * (*ptr). Here, if ptr is indeed NULL, the whole thing evaluates to zero, and NULL isn't dereferenced, as I'd like to.
Question: Are logical operands processed left-to-right or right-to-left?
Details: Let's say my code includes this line
if A = 1 AND B = 2 then
AND is an operator. "A = 1" and "B = 2" are its operands.
Which operand is evaluated first, "A = 1" or "B = 2"?
More Detailed Details*:*
The AND operator has two operands.
- A=1
- B=2
Both of those operands must evaluate to TRUE for the THEN clause to be executed.
If we evaluate A, the left operand, and it's not equal to 1 then we already know the IF clause doesn't pass, and (I assume) VBA will not bother testing B, the right operand. Therefore it would make sense to put the operand which is more likely to fail on the left. That will save on execution time.
However I don't know for sure that the operands of the AND operator are evaluated left-to-right. I'm pretty sure C++ does it right-to-left, for example.
In what order are the two operands of the AND operator evaluated in VBA? Left to right or right to left?
Trying to finish a homework assignment and I am stumped because I can't figure out lines 101-115. More specifically how to make the if-else and for-while functions work. I have tried a few different "i = " definitions (I don't know what it's called) and I've tried changing the operator and this is what I'm stuck on now. Updated Code as of 9/14/2021 (7:28pm EST):
#include <iostream>
#include <string>
using namespace std;
class dayType
{
public:
static string weekDays[7];
dayType();
dayType(string);
void print(); //print
void addDay(int nDays); //adding days
void setDay(string); //set day
void getDay(string);
string getPrevDay(); //retrieve a day
string getNextDay(); //retrieve a day
private:
int i;
};
#pragma once
int main()
{
int i;
string d;
cout << "Enter the day :";
getline(cin, d);
dayType Da(d);
Da.setDay(d);
Da.setDay(d);
cout << "Enter the number of days to add :";
while (!(cin >> i) || i < 0) {
cin.clear();
cin.ignore(999, '\n');
cout << "Invalid data type! \nPlease enter number of days to add :";
}
Da.setDay(d);
Da.print();
system("pause");
return 0;
}
void dayType::setDay(string d)
{
weekDays[0] = "Mon";
weekDays[1] = "Tues";
weekDays[2] = "Wednes";
weekDays[3] = "Thurs";
weekDays[4] = "Fri";
weekDays[5] = "Satur";
weekDays[6] = "Sun";
return setDay(d);
}
void dayType::setDay(string d) {
i = 7;
for (int n = 0; n < 7; n++) {
if (d == weekDays[n]) {
i = n;
}
}
}
void dayType::getDay(string d)
{
if (getDay(d) == weekDays)
{
i = 0;
return weekDays[i];
}
else if (getDay == weekDays[1])
{
i = 1;
return "Tuesday";
}
else if (getDay == weekDays[2])
{
i = 2;
return "Wednesday";
}
else if (getDay == weekDays[3])
{
i = 3;
return "Thursday";
}
else if (getDay == weekDays[4])
{
i = 4;
return "Monday";
}
else if (getDay == weekDays[5])
{
i = 5;
return "Friday";
}
else if (getDay == weekDays[
I'm trying to run this command but I'm getting the entitled error.
$(sshpass -p ${PASSWORD} scp -P 2223 ${FILE_ZIP} pi@${DEVICES_IP[$1]}:~);
>update.sh: line 32: p@sswd: syntax error: operand expected ( error token is "p@sswd")
Any ideas on how to pass the password string?
