c - Tic-Tac-Toe AI picks wrong position -

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i making c program of tic-tac-toe. trying make ai invincible @ moment have encountered problem. problem ai prints symbol in next available question. why? , how can fix it?

here's calling function:

void determinmove(char positions[]) {       int num, i, currentbestscore, score;        currentbestscore = -100;        for(i = 0; < 9; i++)                              {                  if(positions[i] == ' ')                             {                                                    score = getfuturescoreofmove(positions, 'c');                          if(score > currentbestscore)                                 {                                 num = i;                                 currentbestscore = score;                           }                           positions[i] = ' ';                       }             }        positions[num] = comp; }

and other recursive function:

int getfuturescoreofmove(char positions[], char turn)     {        int i, currentbestscore, score;         if(turn == 'c')                       currentbestscore = -100;               else                                     currentbestscore = 100;                 for(i=0; i<9; i++)        {                 if(positions[i] == ' ')                 {                        if(turn == 'c')                              {                            positions[i] = 'x';                            score = getfuturescoreofmove(positions, 'u');                             positions[i] = ' ';                        }                        else                        {                             positions[i] = 'o';                             score = getfuturescoreofmove(positions, 'c');                             positions[i] = ' ';                        }                        if(turn == 'c' && score > currentbestscore)                                                           currentbestscore = score;                        if(turn == 'u' && score < currentbestscore)                          currentbestscore = score;                  }                 }             return(currentbestscore);                     }

as stated i'd know why weird behavior occurs , how fix it.

any appreciated :)

where calculating 1 player has gotten 3 in straight line? in code being calculated. you've iterated through possible board positions recursion haven't considered winning conditions. maybe code in first.


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