cifre5.cpp:4: declaration does not declare anything cifre5.cpp: In function `int main()': cifre5.cpp:9: `n' undeclared (first use this function) cifre5.cpp:9: (Each undeclared identifier is reported only once for each function it appears in.) cifre5.cpp:10: `i' undeclared (first use this function) cifre5.cpp:12: `nr' undeclared (first use this function) cifre5.cpp:13: `x' undeclared (first use this function) cifre5.cpp:17: `a' undeclared (first use this function) cifre5.cpp:20: `b' undeclared (first use this function) cifre5.cpp:24: `v' undeclared (first use this function) cifre5.cpp:26: `j' undeclared (first use this function)