View Compilation Error

0_0_38048142_27446.cpp: In function 'int main()':
0_0_38048142_27446.cpp:5:18: error: 'scanf' was not declared in this scope
  scanf("%d\n", &n);
                  ^
0_0_38048142_27446.cpp:9:10: error: 'gets' was not declared in this scope
   gets(sz);
          ^
0_0_38048142_27446.cpp:10:16: error: 'strlen' was not declared in this scope
   c = strlen(sz);
                ^
0_0_38048142_27446.cpp:11:27: error: 'printf' was not declared in this scope
   printf("String #%d\n", j);
                           ^