View Compilation Error

0_0_30736367_3190.cpp: In function 'long long int exgcd(long long int, long long int, long long int&, long long int&)':
0_0_30736367_3190.cpp:20:37: error: expected primary-expression before '%' token
 int exgcd(int a,int b,int&x,int&y) {%
                                     ^
0_0_30736367_3190.cpp:20:37: error: expected primary-expression at end of input
0_0_30736367_3190.cpp:20:37: error: expected '}' at end of input