Compilare: user.cpp: In function ‘int fill_square(int, int, int, int)’: user.cpp:64:23: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if(holepos = 0){ ^ user.cpp:108:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int showhalf(int, int)’: user.cpp:111:9: warning: unused variable ‘half’ [-Wunused-variable] int half = ulx + (dry - ulx) / 2; ^ user.cpp:112:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:116:18: warning: unused variable ‘hole’ [-Wunused-variable] int n, i, j, hole; ^