Passing matrix structures to functions
Author
Hello all.
I want to pass a char[2][6] matrix structure to function "print"
my functions parameters are "char **", at least I think they should be like that :), now how do I my "str" string matrix to the "print" function from the main func ?
#include<iostream>
using namespace std;
void print(char **s)
{
cout<<s[0];
cout<<endl;
cout<<s[1];
}
void main()
{
char str[2][6]={"Hello","All"};
print(&str[0]); <--- Error
}
create your matrix in a different way
like this:
char ** array = new (char*)[2];
for (int a =0; a < 2; a++)
array[a] = new char[6];
strcpy(array[0], "hello");
strcpy(array[1], "All");
then just send in the char ** to your print funciton and it will work
like this:
char ** array = new (char*)[2];
for (int a =0; a < 2; a++)
array[a] = new char[6];
strcpy(array[0], "hello");
strcpy(array[1], "All");
then just send in the char ** to your print funciton and it will work
Quote:Original post by Joeman
create your matrix in a different way
like this:
char ** array = new (char*)[2];
for (int a =0; a < 2; a++)
array[a] = new char[6];
strcpy(array[0], "hello");
strcpy(array[1], "All");
then just send in the char ** to your print funciton and it will work
or if you really wonted to do what you was doing then it should be like this:
#include <iostream>void print1(char (*s)[6]) { std::cout<< s[0] << '\n' << s[1] << '\n'; }void print2(char s[][6]) { std::cout<< s[0] << '\n' << s[1] << '\n'; }int main() { char str[2][6]={ "Hello", "All" }; print1(str); print2(str); return 0;}but really in c++ you should use real c++ strings and not use raw arrays but standard library containers, in particular vector being the prefered replacement of raw arrays e.g.:
#include <string>#include <vector>#include <iostream>int main() { std::vector<std::string> vec_of_strings(2); vec_of_strings[0] = "Hello"; vec_of_strings[1] = "All"; std::cout << vec_of_strings[0] << '\n'; std::cout << vec_of_strings[1] << std::endl; return 0;}or:
#include <string>#include <algorithm>#include <iterator>#include <vector>#include <iostream>int main() { std::vector<std::string> vec_of_strings; vec_of_strings.push_back("Hello"); vec_of_strings.push_back("All"); std::copy(vec_of_strings.begin(), vec_of_strings.end(), std::ostream_iterator<std::string>(std::cout, "\n")); return 0;}EDIT: also main must have a return type of int, main have having a return type void is non-standard.
EDIT2: I know it seems over the top but it really is worth getting into the habbit learn now rather than latter.
Or you could do this instead of using a pointer to a pointer
EDIT: Meh I need to learn how to type faster...[depressed]
#include<iostream>using namespace std;void print(char s[][6]){cout<<s[0];cout<<endl;cout<<s[1];}int main(){ char str[2][6]={"Hello","All"}; print(str);}EDIT: Meh I need to learn how to type faster...[depressed]
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