Convert char to string doesn't work fine C++ - c++

Question

Well I have that code:
for (int x = 0; x<(worldWidth-1); x++) {
for (int y = 0; y<(worldHeight-1); y++) {
sf::Texture texture;
if (!texture.loadFromFile("images/blocks/" + ruta(mapa[y][x]) + ".png"))
return -1;
sf::RectangleShape rectCaja(sf::Vector2f(16, 16));
rectCaja.setPosition(sf::Vector2f(x*16, y*16));
rectCaja.setTexture(&texture);
window.draw(rectCaja);
}
}
That prints boxes (of 16*16 pixels), that are "blocks" in a game the problem is that it doesn't print any block, it crashes directly I don't know why :/
I know (by consoles tests) that array "mapa" isn't wrong... So the only explanation that I have is that ruta function doesn't work fine... (I have tested it with a std::string var = "dirt"; and it works fine)... :/
std::string ruta(char id) {
if (id=='0') return "air";
if (id=='1') return "stone";
if (id=='2') return "dirt";
if (id=='3') return "grass_side";
if (id=='4') return "coal_ore";
}
If somebody wants the hold code there is: http://pastebin.com/5jvbzwkR
Thanks! :P

Answer 1

Only a guess because there isn't enough information to be sure but this might be the answer
std::string ruta(int id) {
if (id==0) return "air";
if (id==1) return "stone";
if (id==2) return "dirt";
if (id==3) return "grass_side";
if (id==4) return "coal_ore";
}
In C++ you have to be careful about types, and understand the difference, for instance, between an int and a char. A char with value '3' is not the same an an int with value 3.

Answer 2

One issue I immediately see is that you're comparing an int to a char. Consider:
std::string ruta(int id)
{
switch( id )
{
case 0:
return "air";
case 1:
return "stone";
case 2:
return "dirt";
case 3:
return "grass_side";
case 4:
return "coal_ore";
}
}

Answer 3

Here is your scene declaration:
int scene[worldWidth][worldHeight];
Here is how you fill up your scene:
while (!finished) {
if (yPos >= topOfTheWorld) {
scene[xPos][yPos] = 1;
}
else if(yPos < topOfTheWorld) {
scene[xPos][yPos] = 0;
}
//etc...
}
Here is how you write into your mapa.txt:
std::ofstream output("mapa.txt");
for(int y=0;y<worldHeight;y++) {
for(int x=0;x<worldWidth;x++) {
output<<scene[x][y];
if(x<(worldWidth-1)){output<<",";}
}
if(y<(worldHeight-1)){output<<std::endl;}
}
Basically this all means that you are writing the numerical value 0 and 1 into your mapa.txt and not the character values '0' and '1'. Yet in your ruta function you compare with '0' and '1'. You should compare with 0 and 1 without the single quotes (').