Compilare: user.cpp: In function ‘void drum(int, int)’: user.cpp:12:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(i>0&&j>0) ^ user.cpp: In function ‘int main()’: user.cpp:32:37: warning: format ‘%c’ expects argument of type ‘char*’, but argument 3 has type ‘int*’ [-Wformat=] fscanf(f, "%c", &v[i][j]); ^ user.cpp:28:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%i%i", &n, &m); ^ user.cpp:29:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c", &l); ^ user.cpp:32:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c", &v[i][j]); ^