View Compilation Error

0_0_39858513_1810.cpp: In function 'int main()':
0_0_39858513_1810.cpp:4:6: error: 'a' was not declared in this scope
    4 | cin>>a>>b;
      |      ^
0_0_39858513_1810.cpp:4:9: error: 'b' was not declared in this scope
    4 | cin>>a>>b;
      |         ^