multidimensional string c++

I'm writing a function that has a 2D array of strings as input parameter. I initialized the string, passed it to the function but when I tried to print the array nothing happened. It says that the length of the array is 0. All my functions are stored in a header file. Here's my code:

#include<iostream>
#include<string>
#include<iomanip>
using namespace std;

int c,i,j,fx,fy;
int color,fields,rows,anim,speed;
string opt[5][50];
string popt[5][50]={
    {"caption","asdf","safd","asf"},
    {"caption1","dsafa","asdf","asdf"},
    {"caption2","asdf","asdf","asdfas"},
    {"caption3","sadfa","asdfs","fasdfa"}};

void ini(int focus_text_color, int n_fields,int n_rows, string options[][50], bool animation=false, int animation_speed=10)
{
    color=focus_text_color;
    fields=n_fields;
    for(i=1;i<fields+1;i++)
    {
        for(j=1;j<rows+1;j++)
        {
            opt[i][j]=options[i][j];
        }
    }
}

int drawh()
{
    system("cls");
    for(i=0;i<fields;i++)
    {
        for(j=0;j<rows;j++)
        {
            cout<<opt[i][j]<<setw(opt[i+1][j].length()+5);
        }
    }
    return 0; 
}

void main()
{
    ini(LIGHTRED,4,4,popt);
    drawh();
}

NOTE: This is a part of the code so I haven't 开发者_运维技巧tested it, and sorry for my bad English :D

Apart from @Oli's comments. To make it simpler, you can pass an array by reference. See below example:

template<unsigned int ROW, unsigned int COL>
void ini (string (&s)[ROW][COL])  // psuedo code for 'ini'; put extra params to enhance
{
  ini(s, ROW, COL);
}

Now, template ini() provides a wrapper to actual ini() which calculates the row/column of an array at compile time. Usage is very simple:

string s[10][5];
ini(s); // calls ini(s,10,5);

Your loop should start from dimension 0 and not 1 for copying. Check my approach and modify your code.

for(int i = 0; i < ROW; i++)
  for(int j = 0; j < COL; j++)
    s1[i][j] = s2[i][j];

Also there are many problems in your code due to passing wrong dimensions (e.g. passing 4 as dimension while calling ini(), when it should be 5).

The reason why you don't get any output is that you don't initialize the global variable rows, so it stays at 0. Your init function should be:

void ini(int focus_text_color, int n_fields,int n_rows, string options[][50], bool animation=false, int animation_speed=10)
{
    color=focus_text_color;
    fields=n_fields;
    rows = n_rows;   //-- ADDED LINE
 ....