View Compilation Error

0_0_37804972_9031.cpp: In function 'int main()':
0_0_37804972_9031.cpp:10:9: error: 't' was not declared in this scope
         t=abs(n-m);
         ^
0_0_37804972_9031.cpp:11:9: error: 'x' was not declared in this scope
         x=(int)(t*(1+sqrt(5))/2);
         ^
0_0_37804972_9031.cpp:12:15: error: 'a' was not declared in this scope
         if(x==a)
               ^