View Compilation Error

0_0_9153354_11921.cpp: In function `double simpson(double, double, int)':
0_0_9153354_11921.cpp:69: error: `func' undeclared (first use this function)
0_0_9153354_11921.cpp:69: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9153354_11921.cpp: In function `int main()':
0_0_9153354_11921.cpp:103: error: `calc' undeclared (first use this function)