View Compilation Error

0_0_20532084_9084.c:12:1: error: unknown type name 'inline'
 inline ll mod_pow(ll x, ll n, ll mod)
 ^
0_0_20532084_9084.c:12:11: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'mod_pow'
 inline ll mod_pow(ll x, ll n, ll mod)
           ^
0_0_20532084_9084.c:23:8: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'void'
 inline void calc(long long x)
        ^
0_0_20532084_9084.c:38:8: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'int'
 inline int checkc(char c)
        ^
0_0_20532084_9084.c: In function 'main':
0_0_20532084_9084.c:57:11: error: expected expression before '/' token
           //  for (int j = 0; j < n; j++)
           ^
0_0_20532084_9084.c:59:11: error: expected expression before '/' token
           //  printf("\n");
           ^