How to take a SINGLE UNKOWN character from a string

I have a character array, or string, that has a series of...'X'...' '...'F'...'S'...

I have a maze (only one level) where the walls are marked with X's, the walkable space is marked with a space and the start and finish are S and F respectively. I have to read in the maze file in, then make it a 2D array. here is some of my code...

Code:

---

typedef struct MazeStruct
{
        char **maze;            // 2D maze map
        int row;                    // row of the map
        int col;                    // column of the map
        int start_row;            // row of the starting point
        int start_col;            // column of the starting point
} Maze;

//this is the prototype given to me by my instructor. It returns a 1 if successful or a -1 if not.
int GenerateMaze(char* filename, Maze *Mymaze)
{
        if ((fr=fopen(filename,"r")) == NULL) {
                printf("%s could not be found\n",filename);
                return -1;
        }
        char coords[30];
        char *tokptr;
        int row, col;                              **the file has the dimension of the maze at the top
        fgets(coords,15,filename);      **so i use strtok() when i know what the 'token' is
        tokPtr = (strtok(coords, ","));
        row = atoi(tokptr);                //get rows
        tokPtr = (strtok(NULL, ","));
        col = atoi(tokptr);                //get cols

        Mymaze->row = row;
        Mymaze->col = col;

        //Maze allocation                                **not sure how accurate this chunk of code is
        char **Mz;                                         
        int i;
        Mz = (int**)malloc(row*sizeof(int*))
        for (i=0; i<col; i++)
                Mz[i] = (int*)malloc(col*sizeof(int));

        char line[100];
        int c,k, counter = 0;
       
                            **this is where I was going to put the maze into the 2Darray
                            **but idk how to take one character at a time
        for (c=0; c<Mymaze->row;c++) {         
                fgets(line, sizeof(line), filename);
                       
                        for (k=1; k<Mymaze->col; k++)
        }
}

---

Also, if there is a way to take a single character at a time from a file, that would work as well...

Thanks!

fgetc perhaps? Any basic C book should cover this in the chapter about files.


Quzah.

fgetc - C++ Reference

^^^^says that fgetc() returns an integer. How would that work when i need to put it into a character array?
Also, when fgetc() reaches the end of the line, does it automatically go down to the next line?

Characters have integer values. Basically, a valid character gets returned in the range of the character's possibilities, otherwise a different value gets returned for error states.

Go read about data types and the ranges they store.

Quzah.

So i could use the code...

Code:

---

int k;
char n;
k = fgetc(filename);
n = (char)k;

---

to turn the output of fgetc() into a character, correct? or would i have to match up the 0-255 values of the characters i need?
or could i even just do...

Code:

---

char n;
n = fgetc(filename);

---

Code:

---

int c;
while( ( c = fgetc( filepointer ) != EOF )
    printf( "Read \'%c\': %d.\n", c, c );

---

A char is just an int that's small.

Quzah.

> fgets(coords,15,filename);
Did you even compile this!?
fr is the opened file handle, not filename (which is a char pointer)

> **not sure how accurate this chunk of code is
Well
1. Remove all the casts (but then again, you're compiling this as a C++ program aren't you)
2. change all the (int) in sizeof to char, since your base type in the pointer declaration is char
3. the for loop has the wrong limit.

its standard C

OK, so post your latest attempt if you're still stuck.