Problem in copying char array to another char matrix array

Using Arduino Programming Questions
1

Hey there, i'm trying to copy char values into a char matrix, but i don't know why i'm having a strange result.
The reason of this, it's because i need a matrix to have all the values associated to a trayectory mission.
Here's the code:

char matrixMision[20][7][8];
int auxMision;
boolean listo = false;
void setup() {
  Serial.begin(9600);
}

void newMision(int auxMision, float latitud, float longitud){
  char numObjetivo[3];
  String str = String(auxMision);
  str.toCharArray(numObjetivo, 3);
  strcpy(matrixMision[auxMision - 1][0], numObjetivo);
  char estado[2];
  estado[0] = 'P'; //default
  estado[1] = '\0';
  strcpy(matrixMision[auxMision - 1][1], estado);
  char latitudObjetivo[9];
  str = String(latitud ,4); //4 digits of precision
  str.toCharArray(latitudObjetivo, 9);
  strcpy(matrixMision[auxMision - 1][2], latitudObjetivo);
  char longitudObjetivo[9];
  str = String(longitud, 4); //4 digits of precision
  str.toCharArray(longitudObjetivo, 9);
  strcpy(matrixMision[auxMision - 1][3], longitudObjetivo);
  listo = true;
}

void printMatriz(int auxiliar){
  for(int i = 0 ; i < auxiliar ; i++){
    for(int j = 0 ; j < 7 ; j++){
      Serial.print(matrixMision[i][j]);Serial.print(",");
    }
    Serial.println();
  }
}

void loop() {
  auxMision = 1;
  float latitud = -29.9670; //4 digits of precision 
  float longitud = -71.3564; //4 digits of precision
  if(!listo){
    newMision(auxMision, latitud, longitud);
  }else{
    Serial.println("Listo");
  }
  printMatriz(auxMision);
}

The output fot this it's quite rare:
OUTPUT:
Listo
1,P,-29.9670-71.3564,-71.3564,,,,

The problems it's in cursive letters. I don't really know why i'm getting in matrixMision[0][2] that union of values.

2

Which Arduino are you running that code on? A 20 x 7 x 8 char array is 1120 bytes. That's over half the memory on most Arduinos.

  char numObjetivo[3];
  String str = String(auxMision);
  str.toCharArray(numObjetivo, 3);

What a waste. The atoi() function could do that far easier. I hope that auxMision contains no more than two characters.

  char latitudObjetivo[9];
  str = String(latitud ,4); //4 digits of precision
  str.toCharArray(latitudObjetivo, 9);
  strcpy(matrixMision[auxMision - 1][2], latitudObjetivo);

How big is matrixMision[n][m]? It's an array that can hold 8 characters including the terminating NULL. How many characters are you copying? Do you REALLY think they will fit?

3

In the moment that you reply PaulS, i resolved the problem, and was that are you saying.
That char did not fit in the matrix.
Thanks for your time.

4

Ah. And in your reply you said that this code it's a waste:

char numObjetivo[3];
  String str = String(auxMision);
  str.toCharArray(numObjetivo, 3);

But, i don't know why you said that i should use atoi function. I need to get the int auxMision in a char array and i stand the atoi to do the oppossite action (from char* to int) right?

5

If you figured out that atoi() was the wrong function, you should have been able to determine that itoa() was the correct function.