View Compilation Error

0_0_3961615_20234.cpp: In function `int main()':
0_0_3961615_20234.cpp:5: error: `x' undeclared (first use this function)
0_0_3961615_20234.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3961615_20234.cpp:5: error: `y' undeclared (first use this function)
0_0_3961615_20234.cpp:7: error: `s' undeclared (first use this function)