View Compilation Error

123576_0_29334.cpp: In function `int main()':
123576_0_29334.cpp:4: error: `n' undeclared (first use this function)
123576_0_29334.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
123576_0_29334.cpp:4: error: `scanf' undeclared (first use this function)
123576_0_29334.cpp:4: error: `EOF' undeclared (first use this function)
123576_0_29334.cpp:7: error: `a' undeclared (first use this function)
123576_0_29334.cpp:14: error: `num' undeclared (first use this function)
123576_0_29334.cpp:14: error: `memset' undeclared (first use this function)
123576_0_29334.cpp:15: error: `min' undeclared (first use this function)
123576_0_29334.cpp:64: error: `printf' undeclared (first use this function)