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View Compilation Error

0_0_18341323_2614.cpp: In function 'int main()':
0_0_18341323_2614.cpp:5:21: error: 'scanf' was not declared in this scope
  while(scanf("%d",&n)!=EOF)
                     ^
0_0_18341323_2614.cpp:5:24: error: 'EOF' was not declared in this scope
  while(scanf("%d",&n)!=EOF)
                        ^
0_0_18341323_2614.cpp:14:18: error: 'printf' was not declared in this scope
   printf("%d\n",x);
                  ^


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