View Compilation Error

622478_0_0_14464.cpp: In function `int main()':
622478_0_0_14464.cpp:7: error: `sqrt' undeclared (first use this function)
622478_0_0_14464.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
622478_0_0_14464.cpp:9: error: `falg' undeclared (first use this function)
622478_0_0_14464.cpp:12: error: expected `;' before '}' token