View Compilation Error

0_0_22148971_16576.cpp: In function 'int main()':
0_0_22148971_16576.cpp:31:24: error: 'ff' was not declared in this scope
         if(tt*tt != t) ff = 0;
                        ^
0_0_22148971_16576.cpp:32:30: error: 'ff' was not declared in this scope
         if( (tt-3) % 6 != 0) ff = 0;
                              ^
0_0_22148971_16576.cpp:34:12: error: 'ff' was not declared in this scope
         if(ff) {
            ^