View Compilation Error

0_0_38059948_23174.cpp: In function 'int main()':
0_0_38059948_23174.cpp:7:3: error: 'R1' was not declared in this scope
   R1=0,R2=0,R3=0;
   ^
0_0_38059948_23174.cpp:7:8: error: 'R2' was not declared in this scope
   R1=0,R2=0,R3=0;
        ^
0_0_38059948_23174.cpp:7:13: error: 'R3' was not declared in this scope
   R1=0,R2=0,R3=0;
             ^