pic.cpp: In function `int main()': pic.cpp:7: `n' undeclared (first use this function) pic.cpp:7: (Each undeclared identifier is reported only once for each function it appears in.) pic.cpp:8: `x' undeclared (first use this function) pic.cpp:9: `j' undeclared (first use this function) pic.cpp:11: `c' undeclared (first use this function) pic.cpp:12: `a' undeclared (first use this function) pic.cpp:14: `lgmax' undeclared (first use this function) pic.cpp:15: `i' undeclared (first use this function)