Jean

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

bool hasDigitInLine(int grid[9][9], int y, int digit)
{
    int x=0;
    for (x; x<9; x++)
    {
        if(grid[x][y]==digit) return true;
    }
    return false;
}
bool hasDigitInColumn(int grid[9][9], int x, int digit)
{
    int y=0;
    for (y; y<9; y++)
    {
        if(grid[x][y]==digit) return true;
    }
    return false;
}
bool hasDigitInArea(int grid[9][9], int x, int y, int digit)
{
    int i=0, j=0;
    i=x-(x%3);
    j=y-(y%3);
    for(x=i; x<i+3; x++)
    {
        for(y=j; y<j+3; y++)
        {
            if(grid[x][y]==digit) return true;
        }
    }
    return false;
}
void printGrid(int grid[9][9])
{
    int i, j;
    printf("\n===========\n");
    for(i = 0; i < 9; i++)
    {
        for(j = 0; j < 9; j++)
        {
            printf("%d", grid[i][j]);
            if ((j == 2) || (j == 5)) printf("|");
        }
        printf("\n");
        if ((i == 2) || (i == 5)) printf("-----------\n");
    }
    printf("===========\n");
}
void solver(int grid[9][9], int x, int y)
{
    int i;
    if(grid[x][y]==0)
    {
        for(i=1; i<10; i++)
        {
            if((!hasDigitInLine(grid,y,i)) && (!hasDigitInColumn(grid,x,i)) && (!hasDigitInArea(grid,x,y,i)))
            {
                grid[x][y]=i;
                printf("x=%d y=%d i=%d\n", x, y, i);
                x++;
                if(x==9)
                {
                    x=0;
                    y++;
                }
                if((x==0) && (y==9))
                {
                    return;
                }*/
                //solver(grid,x,y);
            }
        }
        grid[x][y]=0;
    }
    else
    {
        x++;
        if(x==9)
        {
            x=0;
            y++;
        }
        //resolver(grid,x,y);
        return;
    }
}
int main()
{
    int grid[9][9] = {
    0,8,0,  7,9,0,  0,0,0,
    0,0,0,  0,0,2,  0,9,0,
    0,0,3,  0,0,8,  4,5,0,

    0,0,8,  0,0,0,  0,0,1,
    0,9,6,  0,0,0,  3,7,0,
    3,0,0,  0,0,0,  2,0,0,

    0,3,2,  5,0,0,  9,0,0,
    0,4,0,  8,0,0,  0,0,0,
    0,0,0,  0,6,4,  0,2,0
    };
    printGrid(grid);
    solver(grid,0,0);
    printGrid(grid);
    return 0;
}