Compilare: user.cpp: In function ‘int main()’: user.cpp:29:21: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[10000001]’ [-Wformat=] scanf ("%s\n",&s); ^ user.cpp:32:23: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[21]’ [-Wformat=] scanf ("%s\n",&cuv); ^ user.cpp:41:28: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[21]’ [-Wformat=] while(scanf("%s\n",&cuv)!=EOF){ ^ user.cpp:25:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("abc2.in","r",stdin); ^ user.cpp:26:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("abc2.out","w",stdout); ^ user.cpp:29:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%s\n",&s); ^ user.cpp:32:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%s\n",&cuv); ^