View Compilation Error

0_0_5493320_5281.cpp: In function `int main()':
0_0_5493320_5281.cpp:3: error: `cin' undeclared (first use this function)
0_0_5493320_5281.cpp:3: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5493320_5281.cpp:10: error: `v' undeclared (first use this function)
0_0_5493320_5281.cpp:26: error: `cout' undeclared (first use this function)
0_0_5493320_5281.cpp:27: error: `system' undeclared (first use this function)