View Compilation Error

0_0_10522950_19022.cpp: In function `int main()':
0_0_10522950_19022.cpp:6: error: `nn' undeclared (first use this function)
0_0_10522950_19022.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10522950_19022.cpp:6: error: `scanf' undeclared (first use this function)
0_0_10522950_19022.cpp:6: error: `EOF' undeclared (first use this function)
0_0_10522950_19022.cpp:12: error: `printf' undeclared (first use this function)
0_0_10522950_19022.cpp:13: error: `ss' undeclared (first use this function)
0_0_10522950_19022.cpp:13: error: `memset' undeclared (first use this function)