View Compilation Error

0_0_23635536_5587.cpp: In function 'int exgcd(long long int, long long int, long long int&, long long int&)':
0_0_23635536_5587.cpp:15:39: error: invalid initialization of non-const reference of type 'long long int&' from an rvalue of type 'long long int*'
     long long int  r=exgcd(b,a%b,&x,&y);
                                       ^
0_0_23635536_5587.cpp:7:5: note: in passing argument 3 of 'int exgcd(long long int, long long int, long long int&, long long int&)'
 int exgcd(long long int a,long long int b,long long int &x,long long int &y)
     ^
0_0_23635536_5587.cpp: In function 'int main()':
0_0_23635536_5587.cpp:29:28: error: invalid initialization of non-const reference of type 'long long int&' from an rvalue of type 'long long int*'
         d=exgcd(b,a%b,&x,&y);
                            ^
0_0_23635536_5587.cpp:7:5: note: in passing argument 3 of 'int exgcd(long long int, long long int, long long int&, long long int&)'
 int exgcd(long long int a,long long int b,long long int &x,long long int &y)
     ^