View Compilation Error

0_0_12196659_24312.cpp: In function `int main()':
0_0_12196659_24312.cpp:13: error: `sqrt' undeclared (first use this function)
0_0_12196659_24312.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12196659_24312.cpp:18: error: invalid operands of types `int' and `<unknown type>' to binary `operator<<'
0_0_12196659_24312.cpp:18: error: expected `)' before ';' token