View Compilation Error

0_0_36395553_2661.cpp: In function 'int main()':
0_0_36395553_2661.cpp:3:1: error: '__int64' was not declared in this scope
 __int64 n;
 ^
0_0_36395553_2661.cpp:4:22: error: 'n' was not declared in this scope
 while(scanf("%I64d",&n)!=EOF)
                      ^
0_0_36395553_2661.cpp:4:23: error: 'scanf' was not declared in this scope
 while(scanf("%I64d",&n)!=EOF)
                       ^
0_0_36395553_2661.cpp:4:26: error: 'EOF' was not declared in this scope
 while(scanf("%I64d",&n)!=EOF)
                          ^
0_0_36395553_2661.cpp:7:19: error: 'printf' was not declared in this scope
 printf("%I64d\n",n);
                   ^