View Compilation Error

0_0_6079343_27649.cpp: In function `int main()':
0_0_6079343_27649.cpp:34: error: `R1' undeclared (first use this function)
0_0_6079343_27649.cpp:34: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6079343_27649.cpp:34: error: `R2' undeclared (first use this function)
0_0_6079343_27649.cpp:34: error: `R3' undeclared (first use this function)