#include <iostream>
#include <array>
using namespace std;
int main(){
int a = [];
int b = 10;
std::fill(a);
cout<<a<<endl;
}
I have an array "a" and want to fill it with an integer "b". As I remember in python its simply uses apppend, does someone know solution?
Here one solution how to use your array header.
int b = 10;
std::array<int, 3> a;
std::fill(begin(a), end(a), b);
I have an array "a"
int a = [];
What you have is a syntax error.
As I remember in python its simply uses apppend
A major difference between a C++ array and python list is that the size of C++ array cannot change, and thus nothing can be appended into it.
How to fill array in C++?
There is indeed a standard algorithm for this purpose:
int a[4];
int b = 10;
std::fill_n(a, std::size(a), b);
Decide the size for a, as it is an array not a list. For example:
int a[10];
Then use index values to fill in the array like:
a[0] = 1;
a[1] = 4;
etc.
If you want a dynamic array use std::vector instead
Here is how its done with vectors:
std::vector<int> myvector;
int myint = 3;
myvector.push_back (myint);
std::fill(std::begin(a), std::end(a), some_value);Following zohaib's answer: If your array is of fixed length: You can use the array's 'fill' member function like this: a.fill(b); If your array can change it's size you can use the std's fill function like this: std::fill(a.begin(), a.end(), b);
a.fill(b); and std::fill(a.begin(),a.end(),b) are doing the same
afirst, or usestd::vector.int a = [];is not valid C++.aas astd:arraywould let you usestd::array::fill()-- en.cppreference.com/w/cpp/container/array/fillstd::filltakes 3 parameters: starting address, one past end, and fill value.