View Compilation Error

0_0_35748515_11992.cpp: In function 'int main()':
0_0_35748515_11992.cpp:7:13: error: 'a' was not declared in this scope
         for(a=0;a<=65;a++)
             ^
0_0_35748515_11992.cpp:16:12: error: 'a' was not declared in this scope
         if(a>=66)
            ^