Eroare de compilare: user.cpp: In function ‘int read_int()’: user.cpp:62:31: error: ‘isdigit’ was not declared in this scope while(!isdigit(c=read_ch())&&c!='-'); ^ user.cpp:68:30: error: ‘isdigit’ was not declared in this scope while(isdigit(c=read_ch())) ^ user.cpp: In function ‘int main()’: user.cpp:115:5: error: expected ‘;’ before ‘for’ for(int i=1;i<=5000;i++) ^ user.cpp:115:17: error: ‘i’ was not declared in this scope for(int i=1;i<=5000;i++) ^ user.cpp:115:28: error: expected ‘;’ before ‘)’ token for(int i=1;i<=5000;i++) ^