View Compilation Error

0_0_5305969_15674.cpp: In function `int main()':
0_0_5305969_15674.cpp:9: error: `cin' undeclared (first use this function)
0_0_5305969_15674.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5305969_15674.cpp:14: error: expected `)' before "ans"