View Compilation Error

0_0_6442434_28203.cpp: In function `void mulans(int)':
0_0_6442434_28203.cpp:109: error: `mod' undeclared (first use this function)
0_0_6442434_28203.cpp:109: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6442434_28203.cpp: In function `void multmp(int, int)':
0_0_6442434_28203.cpp:128: error: `mod' undeclared (first use this function)