View Compilation Error

0_0_17368686_23515.cpp: In function 'long long int pow_mod(long long int, long long int)':
0_0_17368686_23515.cpp:46:12: error: expected ')' at end of input
         a=(a
            ^
0_0_17368686_23515.cpp:46:12: error: expected ';' at end of input
0_0_17368686_23515.cpp:46:12: error: expected '}' at end of input
0_0_17368686_23515.cpp:46:12: error: expected '}' at end of input