View Compilation Error

0_0_7105404_26950.cpp: In function `int main()':
0_0_7105404_26950.cpp:109: error: `charstr1' undeclared (first use this function)
0_0_7105404_26950.cpp:109: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7105404_26950.cpp:109: error: `str2' undeclared (first use this function)
0_0_7105404_26950.cpp:112: error: `str1' undeclared (first use this function)