I'm trying to create a tic tac toe game, but I'm getting a strange warning:Code:#include <stdio.h> #include <stdbool.h> #define M 5 #define N 5 // 2 - free spot ; -1 - vertical line ; -2 - horizontal line ; 1 - X ; 0 - 0 int board[M][N]; void printBoard(int board[M][N]) { int i,j; for(i = 0; i < 5; i=i+2) { for(j = 1; j <= 3; j = j+2) { board[i][j] = -1; } } for(j = 0; j < 5; j++) { board[1][j] = -2; board[3][j] = -2; } for(i = 0; i <= 4; i=i+2) { for(j= 0; j <= 4; j=j+2) { board[i][j] = 2; } } for(i = 0; i < 5; i++) { for(j = 0; j < 5; j++) { if(board[i][j] == -1) { putchar('|'); } else if(board[i][j] == 2) { putchar(' '); } else if(board[i][j] == -2) { putchar('-'); } else if(board[i][j] == 1) { putchar('X'); } else if(board[i][j] == 0) { putchar('0'); } } putchar('\n'); } } bool isEmpty(int board[M][N], int i, int j) { if(board[i][j] == 2) return true; else return false; } void place_X(int board[M][N], int i, int j) { if(isEmpty(board,i,j)) board[i][j] = 1; else printf("The block has already been used!\n"); } void place_zero(int board[M][N], int i, int j) { if(isEmpty(board,i,j)) board[i][j] = 0; else printf("The block has already been used!\n"); } bool checkBoardFull(int board [M][N]) { int i,j; for(i = 0; i < 5; i++) { for(j = 0; j < 5; j++) { if(isEmpty(board, i, j)) return false; } } return true; } int main(int argc, char **argv) { bool running = true; char user_1[20], user_2[20]; int i,j; printf("Enter the name of player 1 (X):\n"); scanf("%19s", user_1); printf("Enter the name of player 2 (0):\n"); scanf("%19s", user_2); printf("\n\n"); printf("\t\t\t||------------------------------------||\n"); printf("\t\t\t||------------------------------------||\n"); printf("\t\t\t|| ||\n"); printf("\t\t\t|| ||\n"); printf("\t\t\t|| ||\n"); printf("\t\t\t|| %s vs %s ||\n", user_1, user_2); printf("\t\t\t|| ||\n"); printf("\t\t\t|| ||\n"); printf("\t\t\t|| ||\n"); printf("\t\t\t||------------------------------------||\n"); printf("\t\t\t||------------------------------------||\n"); printf("\n\n"); printBoard(board); while(running) { if(!checkBoardFull) { printf("Pick i position:\n"); scanf("%d", &i); printf("Pick j position:\n"); scanf("%d", &j); place_X(board, i , j); printBoard(board); } running = false; printBoard(board); } return 0; }
warning: the address of ‘checkBoardFull’ will always evaluate as ‘true’ [-Waddress]
137 | if(!checkBoardFull)
Any idea why?