Compilare: user.cpp:17:19: warning: multi-character character constant [-Wmultichar] if(p-a+1=='70') ^ user.cpp: In function ‘int main()’: user.cpp:12:19: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] a[strlen(a)-1]=NULL; ^ user.cpp:21:27: warning: statement has no effect [-Wunused-value] strchr(p+1,'('); ^ user.cpp:11:20: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(a,1601,f); ^