Compilare: main.cpp: In function 'int main()': main.cpp:21:13: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] s[n2+2]=NULL; ^~~~ main.cpp:38:13: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] s[n2+2]=NULL; ^~~~ main.cpp:12:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("aparitii2.in", "r",stdin); ^ main.cpp:13:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("aparitii2.out", "w",stdout); ^ main.cpp:15:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s1+1); ^ main.cpp:16:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s2+1); ^