View Compilation Error

72616_0_17413.cpp: In function `int yingshe(char*)':
72616_0_17413.cpp:4: error: `strcmp' undeclared (first use this function)
72616_0_17413.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
72616_0_17413.cpp:24: error: `exit' undeclared (first use this function)
72616_0_17413.cpp: In function `int main()':
72616_0_17413.cpp:35: error: `strcmp' undeclared (first use this function)
72616_0_17413.cpp:46: error: expected `}' at end of input