View Compilation Error

0_0_3326413_13590.cpp: In function `int main()':
0_0_3326413_13590.cpp:26: error: `ix' undeclared (first use this function)
0_0_3326413_13590.cpp:26: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3326413_13590.cpp:27: error: `iy' undeclared (first use this function)