Code:

#include <iostream>
#include <cstdlib>
using namespace std;
void makeboard();
bool boardtest();
void solver();
int sudokuboard[9][9];
void enternumber(bool g1, bool g2, bool g3, bool g4, bool g5, bool g6, bool g7, bool g8, bool g9, int x4, int y4);
int main()
{
cout << "this program solves a sudoku puzzle. to enter a new puzzle type the\nnumbers as you would read them, putting 0 for an empty space" << endl;
makeboard(); // note that the x and y are oriented the same way they are in a graph
solver();
cout << "here is the solved board";
for(int x2 = 0; x2 < 9; x2++)
{
for(int y2 = 0; y2 < 9; y2++)
{
cout << sudokuboard[x2][y2] << " ";
}
cout << endl;
}
cout << "the program was a success" << endl;
return 0;
}
void makeboard()
{
while(1)
{
cout << "enter the numbers please" << endl;
int x = 0;
int y = 0;
while(x >= 0 && x < 9)
{
y = 0;
while(y >= 0 && y < 9)
{
cin >> sudokuboard[x][y]; // note that the x and y axes are oriented the same way they are in a graph
y++;
}
x++;
}
if(boardtest() == true)
{
cout << "the board tested ok" << endl;
return;
}
else
{
cout << "there was an error with the input of the program. please enter your numbers again." << endl;
}
}
}
bool boardtest()
{
int x = 0;
int y = 0;
cout << "testing the board...";
while(x >= 0 && x < 9)
{
y = 0;
while(y >= 0 && y < 9)
{
if(sudokuboard[x][y] >= 0 && sudokuboard[x][y] < 10)
{;}
else
{
return false;
}
y++;
}
x++;
}
return true;
}
void solver()
{
bool solvedtest[81];
for(int starter = 0; starter < 81; starter++)
{
solvedtest[starter] = 0;
}
int solvetestnumber;
int x = 0;
int y = 0;
int ytester = 0;
int xtester = 0;
int xbox[3], ybox[3];
bool guess1 = false, guess2 = false, guess3 = false, guess4 = false, guess5 = false, guess6 = false, guess7 = false, guess8 = false, guess9 = false;// tests for 1,2,3,4,5,6,7,8,9
bool completelysolved = false;
bool completelysolved2 = false;
beginning:;
while(completelysolved2 == false)
{
completelysolved2 = true;
for(int x3 = 0; x3 < 9; x3++)
{
for(int y3 = 0; y3 < 9; y3++)
{
for(; solvetestnumber < 81; solvetestnumber++)
if(sudokuboard[x3][y3] != 0)
{
solvedtest[solvetestnumber] = 1;
}
for(int starter = 0; starter < 81; starter++)
{
if(solvedtest[starter] == 0)
{
completelysolved = false;
}
else
{
completelysolved = true;
}
if(completelysolved == false)
{
completelysolved2 = false;
}
if(!completelysolved2)
{
goto beginning;
}
}
}
}
x = 0;
for(; x < 9; x++)
{
y = 0;
for(; y < 9; y++)
{ // the following lines should be indented one tab less but idk how to do it all at once so they arent, feel free to change this.
if(sudokuboard[x][y] == 0) // makes sure the square is not filled already
{
cout << "attempting to solve square (" << x + 1 << "," << y + 1 << ")." << endl;
while(ytester < 9) //sets a limit on ytester
{ // this is the part that tests the row/column x
switch(sudokuboard[x][ytester]) //tests what it is & elimminates the corresponding guess if it is a number
{
case 1:
{
guess1 = true;
break;
}
case 2:
{
guess2 = true;
break;
}
case 3:
{
guess3 = true;
break;
}
case 4:
{
guess4 = true;
break;
}
case 5:
{
guess5 = true;
break;
}
case 6:
{
guess6 = true;
break;
}
case 7:
{
guess7 = true;
break;
}
case 8:
{
guess8 = true;
break;
}
case 9:
{
guess9 = true;
break;
}
}
ytester++;
}
while(xtester < 9) //sets a limit on yline
{ // this is the part that tests the y row/column
switch(sudokuboard[xtester][y])//tests what it is & elimminates the corresponding guess if it is a number
{
case 1:
{
guess1 = true;
break;
}
case 2:
{
guess2 = true;
break;
}
case 3:
{
guess3 = true;
break;
}
case 4:
{
guess4 = true;
break;
}
case 5:
{
guess5 = true;
break;
}
case 6:
{
guess6 = true;
break;
}
case 7:
{
guess7 = true;
break;
}
case 8:
{
guess8 = true;
break;
}
case 9:
{
guess9 = true;
break;
}
}
xtester++;
}
switch(x) // this finds the box's x paremeter
{
case 1:{}
case 2:{}
case 3:
{
xbox[1] = 0;
xbox[2] = 1;
xbox[3] = 2;
break;
}
case 4:{}
case 5:{}
case 6:
{
xbox[1] = 3;
xbox[2] = 4;
xbox[3] = 5;
break;
}
case 7:{}
case 8:{}
case 9:
{
xbox[1] = 6;
xbox[2] = 7;
xbox[3] = 8;
break;
}
}
switch(y) // this finds the boxs y paremeter
{
case 1:{}
case 2:{}
case 3:
{
ybox[1] = 0;
ybox[2] = 1;
ybox[3] = 2;
break;
}
case 4:{}
case 5:{}
case 6:
{
ybox[1] = 3;
ybox[2] = 4;
ybox[3] = 5;
break;
}
case 7:{}
case 8:{}
case 9:
{
ybox[1] = 6;
ybox[2] = 7;
ybox[3] = 8;
break;
}
}
for(int xlimit = 0; xbox[xlimit] < 3; xlimit++) // this will test the 3x3 square box
{
for(int ylimit = 0; ybox[ylimit] < 3; ylimit++)
{
switch(sudokuboard[xbox[xlimit]][ybox[ylimit]]) //tests what it is & elimminates the corresponding guess if it is a number
{
case 1:
{
guess1 = true;
break;
}
case 2:
{
guess2 = true;
break;
}
case 3:
{
guess3 = true;
break;
}
case 4:
{
guess4 = true;
break;
}
case 5:
{
guess5 = true;
break;
}
case 6:
{
guess6 = true;
break;
}
case 7:
{
guess7 = true;
break;
}
case 8:
{
guess8 = true;
break;
}
case 9:
{
guess9 = true;
break;
}
}
}
}
// i need to add a test chassis to put in numbers if the program has solved it.
enternumber(guess1, guess2, guess3, guess4, guess5, guess6, guess7, guess8, guess9, x, y);
if(sudokuboard[x][y] != 0)
{
goto beginning;
}
}
}
}
}
x = 0;
y = 0;
return;
}
void enternumber(bool g1, bool g2, bool g3, bool g4, bool g5, bool g6, bool g7, bool g8, bool g9, int x4, int y4)
{
int gnumber[9];
for(int a = 0; a < 9; a++)
{
gnumber[a] = 0;
}
if(!g1)
{
gnumber[0] = 1;
}
if(!g2)
{
gnumber[1] = 2;
}
if(!g3)
{
gnumber[2] = 3;
}
if(!g4)
{
gnumber[3] = 4;
}
if(!g5)
{
gnumber[4] = 5;
}
if(!g6)
{
gnumber[5] = 6;
}
if(!g7)
{
gnumber[6] = 7;
}
if(!g8)
{
gnumber[7] = 8;
}
if(!g9)
{
gnumber[8] = 9;
}
bool solved1;
int solved2;
for(int b = 0; b < 9; b++)
{
if(gnumber[b] == 0)
{
solved1 = 1;
}
if(solved1)
{
solved2++;
}
solved1 = 0;
}
if(solved2 > 1)
{}
else if(solved2 < 1)
{
for(int c = 0; c < 9; c++)
{
switch(gnumber[c])
case 0:
{
sudokuboard[x4][y4] = (c + 1);
break;
}
}
}
return;
}

You should put your code in code tags in your post, not attach it as a text file.