Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:13:25: error: ‘strlen’ was not declared in this scope int p=0,n=strlen(c+1); ^ user.cpp:10:9: warning: unused variable ‘a’ [-Wunused-variable] int a='a',b='z',i; ^ user.cpp:10:15: warning: unused variable ‘b’ [-Wunused-variable] int a='a',b='z',i; ^