View Compilation Error

256939_0_15022.cpp: In function `int main()':
256939_0_15022.cpp:8: error: `string' undeclared (first use this function)
256939_0_15022.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
256939_0_15022.cpp:8: error: expected `;' before "ss"
256939_0_15022.cpp:9: error: `ss' undeclared (first use this function)