View Compilation Error

0_0_16892935_16367.cpp: In function 'int main()':
0_0_16892935_16367.cpp:9:12: error: 'pow' was not declared in this scope
 d=pow(d,0.5);
            ^
0_0_16892935_16367.cpp:13:1: error: expected primary-expression before ']' token
 ]
 ^
0_0_16892935_16367.cpp:13:1: error: expected '}' at end of input