Eroare de compilare: user.cpp: In function ‘void scadere_1(char*)’: user.cpp:75:13: error: ‘strrev’ was not declared in this scope strrev(a); ^ user.cpp:86:14: warning: NULL used in arithmetic [-Wpointer-arith] if(a[0]==NULL) ^ user.cpp: In function ‘int main()’: user.cpp:94:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifra.in","r",stdin); ^ user.cpp:95:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifra.out","w",stdout); ^ user.cpp:97:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:98:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&x); ^ user.cpp:100:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(n); ^