ok, here is my other program that I am having trouble with. It will look familiar. I have 2 linking errors that I cannot figure out. I hope you can help.
Code:#include <iostream> #include<ctime> using namespace std; void drawboard(int size, int sol); void AddQueen(int size, int row, int boards, int sol); int size; int col[]; // column with the queen bool colfree[16]; // is the column free? bool upfree[16]; //is the upward diagonal free? bool downfree[16]; //is the downward diagonal free? int main() //starts main { int row = -1; //row whose queen is currently placed int boards = 0; //number of positions investigated int sol = 0; //number of solutions found cout<<"What size board do you want?"; cin>>size; int i; for (i = 0; i < size; i++) colfree[i] = true; for (i = 0; i < size; i++) { upfree[i] = true; downfree[i] = true; } AddQueen(size, row, boards, sol); //add function to print board and count # of times ran return 0; } //AddQueen: attempt to place a queen void AddQueen(int size, int row, int boards, int sol) { //AddQueen int c; //column being tried for the queen float randnum; //random number for placing if queen randnum=rand()%11; boards++; row++; for (c = 0; c < 8; c++) if (colfree[c] && upfree[row+c] && downfree[row-c+7]) { col[row] = c; //put a queen in (row,c) colfree[c] = false; upfree[row+c] = false; downfree[row-c+7] = false; if (row == 7) //end condition drawboard(size, sol); else AddQueen(size, row, sol, boards); colfree[c] = true; //now backtrack by removing the queen upfree[row+c] = true; downfree[row-c+7] = true; } row--; } //drawboard: print a solution void drawboard(int size, int sol) { int i, j; sol++; cout << "board ran" << sol << " times" <<endl; cout << "-----------------" << endl; for (i = 0; i < 8; i++) {//for for (j = 0; j < col[i]; j++) cout << " -"; cout << " Q"; for (j++; j < 8; j++) cout << " -"; cout << endl; } cout << "-----------------" << endl; }
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