Compilare: user.cpp: In function ‘void cpy_(char*, char*)’: user.cpp:20:20: warning: NULL used in arithmetic [-Wpointer-arith] for( i=1;b[i]!=NULL || a[i]!=NULL;i++ ) ^ user.cpp:20:34: warning: NULL used in arithmetic [-Wpointer-arith] for( i=1;b[i]!=NULL || a[i]!=NULL;i++ ) ^ user.cpp: In function ‘int cmp_(char*, char*)’: user.cpp:27:18: warning: NULL used in arithmetic [-Wpointer-arith] while( a[i]!=NULL && b[i]!=NULL && a[i]==b[i] ) ^ user.cpp:27:32: warning: NULL used in arithmetic [-Wpointer-arith] while( a[i]!=NULL && b[i]!=NULL && a[i]==b[i] ) ^ user.cpp:30:15: warning: NULL used in arithmetic [-Wpointer-arith] if( a[i]==NULL && b[i]!=NULL ) ^ user.cpp:30:29: warning: NULL used in arithmetic [-Wpointer-arith] if( a[i]==NULL && b[i]!=NULL ) ^ user.cpp:33:19: warning: NULL used in arithmetic [-Wpointer-arith] if( a[i]!=NULL && b[i]==NULL ) ^ user.cpp:33:33: warning: NULL used in arithmetic [-Wpointer-arith] if( a[i]!=NULL && b[i]==NULL ) ^ user.cpp:36:23: warning: NULL used in arithmetic [-Wpointer-arith] if( a[i]==NULL && b[i]==NULL ) ^ user.cpp:36:37: warning: NULL used in arithmetic [-Wpointer-arith] if( a[i]==NULL && b[i]==NULL ) ^ user.cpp: In function ‘void swap_(int, int)’: user.cpp:49:9: warning: unused variable ‘k’ [-Wunused-variable] int k; ^ user.cpp: In function ‘void print_(int)’: user.cpp:88:27: warning: NULL used in arithmetic [-Wpointer-arith] for( i=1;v[k].cuv[i]!=NULL;i++ ) ^ user.cpp: In function ‘int main()’: user.cpp:96:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "zimeria.in", "r", stdin ); ^ user.cpp:97:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "zimeria.out", "w", stdout ); ^ user.cpp:102:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d\n", &p, &n ); ^