How can you convert a 2d char array into a string?
int main()
{
char foo[3][3] = {{'a','b','c'}, {'d','e','f'},{'g','h','i'}};
string bar;
bar = foo;
cout<< bar; //abcdefghi
return 0;
}
also can you convert only select parts of a 2d array to a string?
int main()
{
char foo[3][3] = {{'a','b','c'}, {'d','e','f'},{'g','h','i'}};
string bar;
bar = foo[0][1] + foo[1][2] + foo[2][0];
cout<< bar; //bfg (bar contains only b, f, and g)
return 0;
}
You can use the fact that the elements in the 2D array are contiguous, and the two-iterator constructor of std::string:
char foo[3][3] = {{'a','b','c'}, {'d','e','f'},{'g','h','i'}};
std::string bar(&foo[0][0], &foo[2][2]+1);
std::cout << bar << std::endl; // abcdefgi
Here, &foo[0][0] is a pointer to the first element, and &foo[2][2] + 1 is a pointer to one past the last one. And pointers are iterators.
&foo[2][2] only?
&foo[2][2] would only copy abcdefgh.
Input iterators to the initial and final positions in a range. The range used is [first,last), which includes all the characters between first and last, including the character pointed by first but not the character pointed by last. Source: cplusplus.com/reference/string/string/string Might help others who try to figure this out.std::string constructor reference. I think all the information is there.hope this piece of code will help, welcome to c++
#include <iostream>
using namespace std;
int main()
{
char foo[3][3] = {{'a','b','c'}, {'d','e','f'},{'g','h','i'}};
string bar;
bar = "";
for(int i =0 ; i< 3;i++)
{
for(int j =0 ;j<3;j++)
{
bar += foo[i][j];
}
}
cout<< bar; //abcdefghi
return 0;
}
using namespace; no need from bar = "";; you can use std::string::reserve to increase performance; I'd use std::string::append instead. Just opinion.
bar += foo[i][j];) does!
The C++ standard does not contain a function to this, so you'll have to write your own.
You can use the following code:
int main(int argc, char const *argv[])
{
char foo[3][3] = {{'a','b','c'}, {'d','e','f'},{'g','h','i'}};
string bar;
for(int i = 0; i < 3; i++)
{
for(int j = 0; j < 3; j++)
{
bar.append(foo[i][j]);
}
}
cout << bar;
return 0;
}
This code iterate through the 2d array, which is acually an array or arrays, and add each character to the string.
int main(){
Char ar[4][10]=.
{"one","two","three","four"};
for(int i=0;i<4;i++)
{
Cout<<ar[i]<<endl;
}
return 0;
}
also can you convert only select parts of a 2d array to a stringcan you explain this a lil more'\0'terminators in the 2nd array level.