View Compilation Error

0_0_17470370_19776.cpp: In function 'int main()':
0_0_17470370_19776.cpp:31:12: error: 'a' was not declared in this scope
         if(a==0&&b==0)break;
            ^
0_0_17470370_19776.cpp:31:18: error: 'b' was not declared in this scope
         if(a==0&&b==0)break;
                  ^