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View Compilation Error

0_0_18427953_21540.cpp: In function 'int main()':
0_0_18427953_21540.cpp:4:31: error: 'scanf' was not declared in this scope
  while(scanf("%c%c%c",&a,&b,&c)!=EOF)
                               ^
0_0_18427953_21540.cpp:4:34: error: 'EOF' was not declared in this scope
  while(scanf("%c%c%c",&a,&b,&c)!=EOF)
                                  ^
0_0_18427953_21540.cpp:9:27: error: 'printf' was not declared in this scope
  printf("%c %c %c\n",a,b,c);                
                           ^


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