[Problem] Sudoku

[Simula]

Hello forum I have been stuck on creating a c++ project that creates a complete sudoku from blank.

I work with an array with 81 indexes, it starts in the upper leftcorner with 0 and ends in the lower rightcorner with 80. The array contains characters instead of integers.

EDIT : I deleted my code because it tried solving the sudoku the wrong way.

- Output of my first attemp :

---------------------------
|1 2 3 | 4 5 6 | 7 8 9 |
|4 5 6 | 1 2 3 | ? ? ? |
...

It's just too complex for me to try to solve

[cire]

I compiled your code. I paid attention to the warnings the compiler generated:

warning C4715: 'getBlock' : not all control paths return a value
warning C4715: 'fillField' : not all control paths return a value

I placed a line at the end of each function that generated some output when each of those functions didn't return a value.

As it turns out, getBlock always returned a value, but fillField did not. The line of code I inserted at the end of fillField was:

std::cout << "ERROR: fillField failed to return a value - index = " << index << '\n' ;

The resulting output was (non-error messages elided for brevity):

ERROR: fillField failed to return a value - index = 15
ERROR: fillField failed to return a value - index = 16
ERROR: fillField failed to return a value - index = 17
ERROR: fillField failed to return a value - index = 21
ERROR: fillField failed to return a value - index = 22
ERROR: fillField failed to return a value - index = 23
ERROR: fillField failed to return a value - index = 35
ERROR: fillField failed to return a value - index = 43
ERROR: fillField failed to return a value - index = 44
ERROR: fillField failed to return a value - index = 47
ERROR: fillField failed to return a value - index = 49
ERROR: fillField failed to return a value - index = 50
ERROR: fillField failed to return a value - index = 60
ERROR: fillField failed to return a value - index = 69
ERROR: fillField failed to return a value - index = 70
ERROR: fillField failed to return a value - index = 73
ERROR: fillField failed to return a value - index = 76
ERROR: fillField failed to return a value - index = 77

Maybe start there.