View Compilation Error

257392_0_28125.cpp: In function `int main()':
257392_0_28125.cpp:9: error: `string' undeclared (first use this function)
257392_0_28125.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
257392_0_28125.cpp:9: error: expected `;' before "xx"
257392_0_28125.cpp:20: error: `xx' undeclared (first use this function)