View Compilation Error

0_0_8691794_30942.cpp: In function `int readunsigned()':
0_0_8691794_30942.cpp:94: error: `ch' undeclared (first use this function)
0_0_8691794_30942.cpp:94: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8691794_30942.cpp: In function `void putunsigned(const int&)':
0_0_8691794_30942.cpp:108: error: `cstr' undeclared (first use this function)