View Compilation Error

0_0_7927323_2609.cpp: In function `int main()':
0_0_7927323_2609.cpp:54: error: `isdit' undeclared (first use this function)
0_0_7927323_2609.cpp:54: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7927323_2609.cpp:63: error: `getnext' undeclared (first use this function)