View Compilation Error

0_0_32093300_3317.cpp: In function 'int main()':
0_0_32093300_3317.cpp:29:9: error: expected primary-expression before ';' token
    cin>>;
         ^
0_0_32093300_3317.cpp:36:7: error: 'c' was not declared in this scope
    if(c%gcd)
       ^