View Compilation Error

0_0_22835371_20232.cpp: In function 'int main()':
0_0_22835371_20232.cpp:10:26: error: 'sqrt' was not declared in this scope
   for (int i=1; i<=sqrt(x); i++)
                          ^
0_0_22835371_20232.cpp:13:15: error: 'sqrt' was not declared in this scope
   int p=sqrt(x);
               ^