All Questions
Tagged with pass-by-reference function
282 questions
0
votes
2
answers
56
views
Batch function get the value of variable pass by reference
In the below script, there is passed var1 by reference to myDosFunc, so it can change the value.
How can the value of the referenced variable be get within the function without having to pass the ...
- 193
1
vote
1
answer
57
views
Error in using call by reference with function to change the head of a singly linked list
I'm learning linked lists in C, and have come across an error when trying to add a value at beginning of a linked list using functions
#include<stdio.h>
#include<stdlib.h>
struct node{
...
- 13
5
votes
1
answer
103
views
Difference on passing a free function as template argument by value or by reference
Consider this code (godbolt):
#include <iostream>
template<typename F> void call_by_val(F funct)
{
std::cout << "call_by_val(): ";
funct();
}
template<...
- 796
2
votes
1
answer
112
views
How to attach a class function as an ISR callback
I am trying to attach a class function as an ISR callback but I am getting this error:
lib/classA/classA.cpp: In member function 'uint8_t MethodA::Init()':
lib/classA/classA.cpp:32:71: error: invalid ...
-3
votes
1
answer
79
views
Can someone explain to me why after this function is called a becomes 2 instead of 3 or 4?
#include <iostream>
using namespace std;
void f(int &x, int &y)
{
x = 1;
x = x + y;
}
int main()
{
int a = 3;
f(a, a);
cout<<a;
return 0;
}
I found this ...
- 5
0
votes
1
answer
56
views
Why my print statement inside the swap function is giving such output?
#include <stdio.h>
void swap(int* x, int* y){
int temp;
temp = *x;
*x = *y;
*y = temp;
printf("The value of x and y inside the function is x = %d and y = %d", x, y);...
0
votes
0
answers
54
views
compiler does not complain when I do std::move of a const reference [duplicate]
I'm trying to understand which is the most optimized way to pass arguments to functions. I got the answer for the book professional c++ but during some test I ran into a weird behavior.
It's clear ...
- 29
0
votes
0
answers
63
views
What is the best way to pass an object by reference in JavaScript without modifying it
I studied that Javascript passes objects by 'pass by reference' to functions. When those objects are mutated/updated inside a function, then it affects the original object. This is clear!
let obj = {
...
- 71
0
votes
1
answer
53
views
'=' left operator must be an l-value problem encountered while passing value from a function in visual studio C
I'm programming in visual studio C. The program consist tomonitorate monopoly's game and I was wondering about how to passing value of a matrix of struct from a function, but it gaves me error C2106 ('...
- 36
0
votes
1
answer
98
views
Why does the variable, passed as an address to a function, not change its value even if the value is changed in the function?
So, I passed the address of a variable to a particular function. And I changed the value of the variable using pointers inside the function, the change is reflected when I print the variable in the ...
- 3
0
votes
2
answers
83
views
How do I call multiple python functions by reference to operate on a variable so that I can change the sequence of function calls easily?
I want to create a 'function pipeline', like a factory.
Let's say I have the following functions:
def func1(var):
var = # do something with var
return var
def func2(var):
var = # do ...
- 1,774
-1
votes
2
answers
582
views
Why did this python list appear to get passed "by value"? [duplicate]
I defined the following function:
def myFunction(a):
print(f'In function, initial a = {a}, {id(a)}, {type(a)}')
a = a*10
print(f'In function, final a = {a}, {id(a)}, {type(a)}')
return a
When ...
- 1
0
votes
2
answers
71
views
"While loop" (contains pointer to array passed into a function) works only once
I am writing some code in C. Inside the main function there is a while loop with a function call to printboard taking a pointer to array board. Inside the function I have got a printf, that prints 3 ...
- 33
0
votes
2
answers
246
views
Does a function output parameter (a reference paramter) change before the function returns? [closed]
Basically I want to know in C++ if I call a function and pass the arguments by reference, then the arguments are modified only after the function returns or it is possible that they get changed ...
- 61
2
votes
1
answer
167
views
Confusion about making binary search tree EMPTY in C
I want to define a function which makes binary search tree to empty with return-type void.
These are my codes as below :
_Node structure
typedef struct _Node {
int data;
struct _Node* l_child;
...
- 133