View Compilation Error

106837_0_22867.cpp: In function `int main()':
106837_0_22867.cpp:6: error: `scanf' undeclared (first use this function)
106837_0_22867.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
106837_0_22867.cpp:6: error: `NULL' undeclared (first use this function)
106837_0_22867.cpp:15: error: `printf' undeclared (first use this function)