Can anyone tell me what this means and how to fix it? I keep getting this warning, the title of this post, and I'm not quite sure on how to fix it. It is messing up what I'm trying to do. Here's the code:
#include <stdio.h>
#include <stdlib.h>
#define MAXLINELEN 18
FILE *getOpen();
void push(int *, int *);
void popShow();
struct Stack
{
int row;
int col;
struct Stack *priorAddr;
};
struct Stack *tosp;
int main()
{
FILE *inFile;
char **matrix = 0;
int nrows;
int ncols;
int i;
int row;
int col;
char singleLine[MAXLINELEN];
int size;
int location;
int rowElement;
int colElement;
int countSquares;
int block;
// Open the text file containing the matrix.
inFile = getOpen();
tosp = NULL;
// Read in each line of the matrix from the .txt file to determine the number of rows and columns.
nrows = 0;
ncols = 0;
while (fgets(singleLine, MAXLINELEN - 1, inFile) != NULL)
{
nrows++;
ncols++;
printf("#%d: %s\n", nrows, singleLine);
}
size = nrows * ncols;
printf("The size of the Matrix is: %d \n", size);
// Dynamically allocate the matrix.
matrix = malloc(nrows * sizeof(char *));
if(matrix == NULL)
{
printf("Out of memory.\n");
exit(1);
}
for(i = 0; i < nrows; i++)
{
matrix[i] = malloc(ncols * sizeof(char *));
if(matrix[i] == NULL)
{
printf("Out of memory.\n");
exit(1);
}
}
printf("Memory allocated successfully!\n");
// Populate the matrix with the data from the file.
rewind(inFile);
for (row = 0; row < nrows; row++)
{
for (col = 0; col < ncols; col++)
{
if (fscanf(inFile, "%c ", &matrix[row][col]) == 1)
{
printf("%c ", matrix[row][col]);
}
}
putchar('\n');
}
// Search for every non-zero character in the matrix.
for (rowElement = 0; rowElement < row; rowElement++)
{
for (colElement = 0; colElement < col; colElement++)
{
if (matrix[rowElement][colElement] > '0')
{
printf("Non-Zero Character is at Row: %d Col: %d\n", rowElement, colElement);
push(rowElement, colElement); // Warning comes from here.
}
}
}
popShow();
printf("Number of squares: %d\n", countSquares);
printf("Number of blocks: %d\n", block);
system("pause");
return 0;
}
/* =============================================
getOpen
=============================================
This function opens the file for reading, and
returns the file name back to the program for
use.
*/
FILE *getOpen()
{
FILE *fname;
char name[21];
printf("\nEnter a file name: ");
gets(name);
fname = fopen(name, "r");
if (fname == NULL)
{
printf("Failed to open the file %s.\n", name);
exit(1);
}
printf("File was successfully opened!\n");
return(fname);
}
/* ==============================================
push
==============================================
This function pushes the element onto the
stack.
*/
void push(int *row, int *col)
{
struct Stack *newPtr;
newPtr = (struct Stack *) malloc(sizeof (struct Stack));
if (newPtr == (struct Stack *) NULL)
{
printf("\nFailed to allocate memory for this structure\n");
exit(1);
}
newPtr->row = row; // Warning comes from here
newPtr->col = col; // and here.
newPtr->priorAddr = tosp;
tosp = newPtr;
}
/* ==============================================
popShow
==============================================
This function pops the elements off of the
stack and displays them.
*/
void popShow()
{
int row;
int col;
void pop(int *, int *);
printf("\nThe data popped from the stack are:\n");
while (tosp != NULL)
{
pop(row, col); // Warning comes from here as well
printf("Row: %d Col: %d\n", row, col);
}
}
/* ===============================================
pop
===============================================
This function pops the data off the stack.
*/
void pop(int *row, int *col)
{
struct Stack *tempAddr;
tosp->row = row; // These pop up a warning as well
tosp->col = col;
tempAddr = tosp->priorAddr;
free(tosp);
tosp = tempAddr;
}This is probably a stupid question and it's probably staring at me right in the face, but......I'm still quite new to C. Any help would be awesome!
