View Compilation Error

0_0_18688950_8289.cpp: In function 'int main()':
0_0_18688950_8289.cpp:4:6: error: 'a' was not declared in this scope
      a[0]=b[0]=c[0]=0;
      ^
0_0_18688950_8289.cpp:4:11: error: 'b' was not declared in this scope
      a[0]=b[0]=c[0]=0;
           ^
0_0_18688950_8289.cpp:4:16: error: 'c' was not declared in this scope
      a[0]=b[0]=c[0]=0;
                ^
0_0_18688950_8289.cpp:17:24: error: 'scanf' was not declared in this scope
     while(scanf("%d",&n)!=EOF)
                        ^
0_0_18688950_8289.cpp:17:27: error: 'EOF' was not declared in this scope
     while(scanf("%d",&n)!=EOF)
                           ^
0_0_18688950_8289.cpp:19:30: error: 'printf' was not declared in this scope
         printf("%I64d\n",c[n]);
                              ^