I am trying to check whether a row in Sudoku is valid. So in order to do that I take the sum of all the values in that row and check whether it equals a certain amount. I have written a function that takes in two parameters: the 2D list array, and the specific row I want to check. This is my function:
void row_check(int ** array, int x)
{
int total = 0;
for(int i = 0; i < 9; i++)
total = total + array[x][i];
if (total != 45)
printf("Row is invalid!\n");
else
printf("Row is valid\n");
}
This is my main()
int main()
{
grill g2;
init(g2);
g2[6][1] = 5; // here we modify the value on row 6
row_check(g2, 6);
display_sudoku(g2);
return 0;
}
I expect to get a message that tells me whether the row I want to be checked is valid or invalid, but instead, I get the following
sudoku.c:56:15: warning: passing argument 1 of 'row_check' from incompatible pointer type [-Wincompatible-pointer-types]
row_check(g2, 6);
^~
sudoku.c:25:6: note: expected 'int **' but argument is of type 'int (*)[9]'
void row_check(int ** array, int x)
^~~~~~~~~
This is my full program:
#include <stdio.h>
typedef int grill[9][9];
void init(grill g)
{
grill gg = {{1, 2, 3, 4, 5, 6, 7, 8, 9},
{4, 5, 6, 7, 8, 9, 1, 2, 3},
{7, 8, 9, 1, 2, 3, 4, 5, 6},
{2, 3, 1, 5, 6, 4, 8, 9, 7},
{5, 6, 4, 8, 9, 7, 2, 3, 1},
{8, 9, 7, 2, 3, 1, 5, 6, 4},
{3, 1, 2, 6, 4, 5, 9, 7, 8},
{6, 4, 5, 9, 7, 8, 3, 1, 2},
{9, 7, 8, 3, 1, 2, 6, 4, 5}};
int i, j;
for (i = 0; i < 9; i++)
for (j = 0; j < 9; j++)
g[i][j] = gg[i][j];
return;
}
void row_check(int ** array, int x)
{
int total = 0;
for(int i = 0; i < 9; i++)
total = total + array[x][i];
if (total != 45)
printf("Row is invalid!\n");
else
printf("Row is valid\n");
}
void display_sudoku(grill g)
{
printf("\n\t%d %d %d %d %d %d %d %d %d\n", g[0][0], g[0][1], g[0][2], g[0][3], g[0][4], g[0][5], g[0][6], g[0][7], g[0][8]);
printf("\t%d %d %d %d %d %d %d %d %d\n", g[1][0], g[1][1], g[1][2], g[1][3], g[1][4], g[1][5], g[1][6], g[1][7], g[1][8]);
printf("\t%d %d %d %d %d %d %d %d %d\n", g[2][0], g[2][1], g[2][2], g[2][3], g[2][4], g[2][5], g[2][6], g[2][7], g[2][8]);
printf("\n\t%d %d %d %d %d %d %d %d %d\n", g[3][0], g[3][1], g[3][2], g[3][3], g[3][4], g[3][5], g[3][6], g[3][7], g[3][8]);
printf("\t%d %d %d %d %d %d %d %d %d\n", g[4][0], g[4][1], g[4][2], g[4][3], g[4][4], g[4][5], g[4][6], g[4][7], g[4][8]);
printf("\t%d %d %d %d %d %d %d %d %d\n", g[5][0], g[5][1], g[5][2], g[5][3], g[5][4], g[5][5], g[5][6], g[5][7], g[5][8]);
printf("\n\t%d %d %d %d %d %d %d %d %d\n", g[6][0], g[6][1], g[6][2], g[6][3], g[6][4], g[6][5], g[6][6], g[6][7], g[6][8]);
printf("\t%d %d %d %d %d %d %d %d %d\n", g[7][0], g[7][1], g[7][2], g[7][3], g[7][4], g[7][5], g[7][6], g[7][7], g[7][8]);
printf("\t%d %d %d %d %d %d %d %d %d\n\n", g[8][0], g[8][1], g[8][2], g[8][3], g[8][4], g[8][5], g[8][6], g[8][7], g[8][8]);
return;
}
int main()
{
grill g2;
init(g2);
g2[6][1] = 5; // here we modify the value on row 6
row_check(g2, 6);
display_sudoku(g2);
return 0;
}
How do I check my row whether is valid or not
When an array is used in an expression, it decays into a pointer to its first element. This however only applies to the outermost dimension of a multidimensional array.
The type grill is defined as a int [9][9]. This is an array of size 9, whose members are an array of size 9 of type int, i.e. int [9]. So a pointer to an element of an array of type int [9][9] is int (*)[9], not int **.
Change row_check to take a parameter of type grill.
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