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Heartless
I post too much
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Joined: 03 Dec 2006
Posts: 2436
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 Posted: Thu Apr 10, 2008 2:40 pm Post subject: [C++]String Matrix? |
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I'm not 100% sure they are called matrixs, but this is what one would look like.
| Code: | | int Matrix[100][100]; |
Is there even a thing as string matrixs? It work when I compiled this code...
| Code: | #include <iostream>
using namespace std;
int main()
{
char Matrix[100][100];
return 0;
} |
But when I tried to assign it something it won't work.
| Code: |
#include <iostream>
using namespace std;
int main()
{
char Matrix[100][100];
for (int i = 0; i < 100; i++)
{
Matrix[100][i] = "Something";
}
return 0;
}
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What am I doing wrong?
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HalfPrime
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| Posted: Thu Apr 10, 2008 2:52 pm Post subject: |
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String Matrix[100][100];
if you want it to hold a string
for char,
Matrix[100][i] = 'A';
Should work.
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killersamurai
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| Posted: Thu Apr 10, 2008 3:06 pm Post subject: |
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You have the array at 100 , 100. Which the index starts at 0.
| Code: |
Matirx[99][i] = "Something";
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There is another problem. Matrix is declared like this
| Code: |
char Matrix[100][100];
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This only allows you to hold one char. You need to make it a pointer or else you will get an error.
| Code: |
char *Matrix[100][100] = { 0 };
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atom0s
Moderator
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Posts: 8587
Location: 127.0.0.1
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| Posted: Thu Apr 10, 2008 8:24 pm Post subject: |
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Firstly since I don't think you fully understand what a matrix is (not trying to insult you just stating what I observed.)
http://en.wikipedia.org/wiki/Matrix_%28mathematics%29
Heres quick example of a string matrix:
| Code: | #include <iostream>
#include <string>
#include <vector>
std::string strStringMatrix[10][10];
int main()
{
char szInput[255] = {0};
for( int x=0;x<10;x++ )
for( int y=0;y<10;y++ ){
sprintf_s( szInput, sizeof(szInput), "Testing %dx%d", x, y );
strStringMatrix[x][y] = std::string( szInput );
std::cout << "[" << x << "x" << y << "] " << strStringMatrix[x][y].c_str() << std::endl;
}
return 0;
} |
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Jani
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| Posted: Fri Apr 11, 2008 4:58 am Post subject: |
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| HornyAZNBoy wrote: | | Code: |
#include <iostream>
using namespace std;
int main()
{
char Matrix[100][100];
for (int i = 0; i < 100; i++)
{
Matrix[100][i] = "Something";
}
return 0;
}
|
What am I doing wrong? |
The second dimension is for the letters... Matrix[i] = "Something"; would be a bit more closer, but that doesn't work either, since strings can't be set that way. However this DOES work: | Code: | #include <iostream>
#include <string>
int main(int argc, char **argv)
{
std::string test[3][3];
for(int j=0; j<3; ++j)
for(int i=0; i<3; ++i)
test[j][i] = "asd";
for(int j=0; j<3; ++j) {
for(int i=0; i<3; ++i)
std::cout << test[j][i] << " ";
std::cout << std::endl;
}
return EXIT_SUCCESS;
} |
A bit similar to Wiccaan's code, but w/e :P Of course you could do the printing in the same loop, but IMO this demonstrates a bit better the matrix.
A bit offtopic, since you were talking about matrices, but here's a hint: if you need no more than one dimension (the 2nd one is for the chars) I recommend using std::vector..
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