2D字符串数组的最后一个元素覆盖先前的数组元素

Question

void read_char_from_file(FILE *fp, int formatted)
{
    char sChar[16], eol;
    int col=0, row=0,ind=0,count=0;
    char *str2D[4][4]={{ "NULL" }};
    while ( (fscanf(fp, "%s%c", sChar,&eol)) != EOF)
    {
        if(eol!='\n')
        {
            str2D[row][col]=sChar;
            printf("Row: %d, Col: %d = %s\n",row, col,str2D[row][col]);
            col++;
        }
        else {
            str2D[row][col]=sChar;
            printf("Row: %d, Col: %d = %s\n",row, col,str2D[row][col]);
            row++;
            col=0;
        }
        str2D[row][col]=0;
    }

    int i,j;
    for (i=0; i < 3; i++)
    {
        for(j=0; j <3; j++)
        printf("%s",str2D[i][j]);
    }

}

Above code is displaying last element of str2D overwriting all of the previous array contents. I need to copy sChar to 2-D array of strings.

Answer 1

Short Answer:

You are not copying the content into the memory location pointed to by str2D[row][col] , you're just making the pointer point to sChar . Thus, whatever is the latest content of the sChar , is being shown.

Long answer:

You have other issues. First,

• {{ "NULL" }}; is not the same as {{ NULL }};
• You are creating a 2-D array of pointers. Before you can store anything in those memory locations pointed to by the pointers, you need to make sure that they point to some valid locations.