View Compilation Error

174403_0_15333.cpp:5: error: `main' must return `int'
174403_0_15333.cpp: In function `int main(...)':
174403_0_15333.cpp:14: error: `sqrt' undeclared (first use this function)
174403_0_15333.cpp:14: error: (Each undeclared identifier is reported only once for each function it appears in.)