Compilare: user.cpp: In function ‘bool Expresie()’: user.cpp:33:48: warning: NULL used in arithmetic [-Wpointer-arith] while((s[poz]=='&' || s[poz]=='|') && s[poz]!=NULL) ^ user.cpp: In function ‘bool Factor()’: user.cpp:67:6: warning: unused variable ‘tip’ [-Wunused-variable] int tip=-1; ^ user.cpp: In function ‘int main()’: user.cpp:92:11: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] s[n-1]=NULL; ^ user.cpp:113:6: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] s[j]=NULL; ^ user.cpp: In function ‘bool Factor()’: user.cpp:73:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:88:22: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,sizeof s,in); ^ user.cpp:115:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d ",&n); ^ user.cpp:120:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%c ",&x); ^