View Compilation Error

0_0_20430895_30283.cpp: In function 'int main()':
0_0_20430895_30283.cpp:9:11: error: 'ba' was not declared in this scope
      s=as+ba;
           ^
0_0_20430895_30283.cpp:24:2: error: 'retuen' was not declared in this scope
  retuen 0;
  ^