View Compilation Error

0_0_2647664_12104.cpp: In function `int main()':
0_0_2647664_12104.cpp:9: error: `x1' undeclared (first use this function)
0_0_2647664_12104.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2647664_12104.cpp:9: error: `y1' undeclared (first use this function)
0_0_2647664_12104.cpp:9: error: `x2' undeclared (first use this function)
0_0_2647664_12104.cpp:9: error: `y2' undeclared (first use this function)
0_0_2647664_12104.cpp:9: error: `x3' undeclared (first use this function)
0_0_2647664_12104.cpp:9: error: `y3' undeclared (first use this function)
0_0_2647664_12104.cpp: At global scope:
0_0_2647664_12104.cpp:16: error: expected unqualified-id before "return"
0_0_2647664_12104.cpp:16: error: expected `,' or `;' before "return"
0_0_2647664_12104.cpp:17: error: expected declaration before '}' token