View Compilation Error

0_0_12264020_30744.cpp: In function `void read(int&)':
0_0_12264020_30744.cpp:13: error: `ch' undeclared (first use this function)
0_0_12264020_30744.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12264020_30744.cpp: In function `int main()':
0_0_12264020_30744.cpp:58: error: `re' undeclared (first use this function)