is the action of adding an element at the end of a container.
push-back is the action of adding an element at the end of a container.
Questions tagged [push-back]
420 questions
1
vote
3 answers
Typecasting for vector pushback operation in C++
I have two vectors
std::vector outputStack, operatorStack;
At some point, I need to pop some elements out of one stack and push it into another stack.
while(operatorStack.back().compare(L_BRACKET)) {
…
user592748
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1 answer
why vector push_back> not work in a for loop for my defined class
I want use std::vector.push_bask to store 20 numbers of shared_ptr in a for loop.
But from the output: it seems it only pushed one.
And vector::push_back> 20 times worked as designed.
Could some body help me out?
class IObserver{
public:
int…
user1877986
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1
vote
1 answer
when i get an index of a vector in c++, it always returns last value that is push backed
I create a global vector. After that I add values with push_back function. But, when I want to get an arbitrary index of vector, it always returns the last value that was pushed. The code is the following:
struct Choromosome{
float fitness;
…
user1914367
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1 answer
push_back a struct into a vector in a struct
I have the following structs:
enum messageType {New = 0, Old = 1, No_Message = 2};
typedef struct {
enum messageType type;
unsigned int senderID;
char message[100];
} StoredMessageData;
struct StoredMessage {
unsigned int…
Gossamer Shadow
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1
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2 answers
Push_back a variable to vector
Just started learning STL and here is the first problem:
vector vec1;
for(int i = 1; i <= 100; i++)
{
vec1.push_back(i);
cout << vec1[i] << endl;
}
As you may see i want to push back variable i to vector vec1 but output…
Edgaras Ausvicas
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1
vote
2 answers
C++ Input data to vector that is of a user-defined type?
I have to create a banking system program which adds, deletes, looks up, saves to file etc. For this I am required to use a Vector matching the private data member below and it is suggested to use the push_back() function to add new accounts.
The…
user1550409
1
vote
2 answers
Vector push_back overwrites all entries
I want to use the push_back function to fill my vector with lines from a text file. But it overwrites all entries with the last line. Here is the source code:
int main() {
std::vector lines;
FILE* file;
file =…
Homer
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1
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1 answer
vector push_back not working in class object
I am making an hierarchy of sorts and am having trouble adding an element to a vector. I simplified the code and still cannot add an element to the vector as expected. The hierarchy looks like:
Pdb > Chain > strings
Pdb and Chain are class names and…
NCAggie
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1
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4 answers
manipulation of Vectors created with new
Can anyone help with this...
vector *vVec = new vector;
vVec .reserve(frankReservedSpace);
start = std::clock();
for(int f=0; f
Columbo
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1
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3 answers
Array operation, adding element at the end, pushing the other elements back
I'm planning to do a small program that'll display a graph which will be updated a few times per second (maybe 100/200ms or so). The purpose is to plot over 1000 different values in the graph, somewhat like an XY plot.
When the array contains 1000…
user1240989
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2 answers
push_back issue std::vector
OSX 10.7, XCode 4.
I have a small problem: I need to push back a 2D vector> in to a 3D Vector, after a process of selection. It throws the EXC_BAD_ACCESS error in the push_back function in the stl::vector template. It seems like it…
Rhys Davies
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0
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1 answer
String::push_back() does not push back
I am currently writing a infix to postfix converter. It works pretty well except I have problems adding the rest of the Stack to the postfix. The stack is a
vector
and the postfix is a String. After I'm done reading everything I try the…
Teraku
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0
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2 answers
Adding a object having a string member to a vector
class A
{
public:
string name;
float length;
float weight;
bool isEnabled;
};
When I'm doing push_back() on the vector of this class, it works for the first time, but doesn't on the subsequent push_back() calls. Could it…
0
votes
1 answer
(C++) Do different functions need assignment while others do not?
Can someone clarify/correct me on why certain functions such as push_back() do not need an assignment to output the new string, while a function such as substr() needs to be assigned to a string in order for the output to be the new subs-string?
For…
user22099685
0
votes
2 answers
What could be causing the 'expected expression' error when pushing a std::pair to a vector in my graph code using VSCode?
#include
#include
#include
#define ii pair
using namespace std;
// DSK -> DSC
int n;
vector edge;
string s, num;
int main()
{
cin >> n;
cin.ignore();
for(int i = 1; i <= n; i++)
{
…
Mini Cake
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