Compilare: user.cpp: In function ‘int main()’: user.cpp:17:30: warning: format ‘%c’ expects a matching ‘char*’ argument [-Wformat=] scanf("%c%c", &ch); ^ user.cpp:19:44: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if(i % k == n % k && j & k == m % k) ^ user.cpp:6:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bmat.in", "r", stdin); ^ user.cpp:7:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bmat.out", "w", stdout); ^ user.cpp:11:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d\n", &n, &m, &k); ^ user.cpp:17:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c%c", &ch); ^