View Compilation Error

0_0_2336295_20914.cpp: In function `int main()':
0_0_2336295_20914.cpp:70: error: `sx' undeclared (first use this function)
0_0_2336295_20914.cpp:70: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2336295_20914.cpp:70: error: `ex' undeclared (first use this function)
0_0_2336295_20914.cpp:70: error: `sy' undeclared (first use this function)
0_0_2336295_20914.cpp:70: error: `ey' undeclared (first use this function)