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Jul 3rd, 2007

Two-dimensional char array

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What is a two-dimensional char array with 3 rows and 3 columns. Can give me an example of a program. Thanks

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pixrix

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Jul 3rd, 2007

Re: Two-dimensional char array

I won't write the program for you but here is how to declare the array.

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char array[3][3];
char array[3][3];

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Jul 3rd, 2007

Re: Two-dimensional char array

I also know how to wirte it.. but wat is it use for.. can at least show me some example..

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Re: Two-dimensional char array

A real world use of two dimensional arrays is for representing matrices. Here is an example of 3 x 3 identity matrix:

C++ Syntax (Toggle Plain Text)
int matrix[3][3] = {0};
for(int i = 0; i < 3; ++i)
{
    for(int j = 0; j < 3; ++j)
    {
        if(i == j)
            matrix[i][i] = 1;
    }
}
 
//For printing this matrix
    for(int i = 0; i < 3; ++i)
    {
        for(int j = 0; j < 3; ++j)
        {
            cout << "   " << matrix[i][j]) << "   ";
        }
        putchar('\n');
    }
int matrix[3][3] = {0};
for(int i = 0; i < 3; ++i)
{
    for(int j = 0; j < 3; ++j)
    {
        if(i == j)
            matrix[i][i] = 1;
    }
}

//For printing this matrix
    for(int i = 0; i < 3; ++i)
    {
        for(int j = 0; j < 3; ++j)
        {
            cout << "   " << matrix[i][j]) << "   ";
        }
        putchar('\n');
    }

The output after printing this matrix would be:

C++ Syntax (Toggle Plain Text)
 0   0
 1   0
 0   1
 0   0
 1   0
 0   1

Last edited by ~s.o.s~; Jul 3rd, 2007 at 1:33 pm.

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Jul 3rd, 2007

Re: Two-dimensional char array

2 dimensional character arrays can be used to store any list of text items, such as a list of people's names, a list of addresses, telephone numbers, email addresses, etc. If you want a list of 3 names and each name can be a maximum of 20 characters then you would declare the array like below -- since c style strings must be terminated with a NULL character -- '\0' -- you must add one extra byte to the maximum width you want, in this example declare the width as 21 characters.

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char names[3][21];
char names[3][21];

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Jul 5th, 2007

Re: Two-dimensional char array

Thanks guys

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