View Compilation Error

168297_0_142.cpp: In function `int toPos(long int, long int&, long int&, long int&)':
168297_0_142.cpp:6: error: `sqrt' undeclared (first use this function)
168297_0_142.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
168297_0_142.cpp: In function `int main()':
168297_0_142.cpp:22: error: `cin' undeclared (first use this function)
168297_0_142.cpp:30: error: `abs' undeclared (first use this function)
168297_0_142.cpp:45: error: `cout' undeclared (first use this function)
168297_0_142.cpp:45: error: `endl' undeclared (first use this function)