View Compilation Error

91602_0_25508.cpp: In function `int main()':
91602_0_25508.cpp:6: error: `scanf' undeclared (first use this function)
91602_0_25508.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
91602_0_25508.cpp:6: error: `EOF' undeclared (first use this function)
91602_0_25508.cpp:11: error: `getchar' undeclared (first use this function)
91602_0_25508.cpp:20: error: ISO C++ forbids comparison between pointer and integer
91602_0_25508.cpp:20: error: ISO C++ forbids comparison between pointer and integer
91602_0_25508.cpp:26: error: `printf' undeclared (first use this function)