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

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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
 ....