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View Compilation Error

0_0_31940315_30797.cpp: In function 'int main()':
0_0_31940315_30797.cpp:3:37: error: 'scanf' was not declared in this scope
     while(scanf("%c%c%c", &a, &b, &c) != EOF){
                                     ^
0_0_31940315_30797.cpp:3:42: error: 'EOF' was not declared in this scope
     while(scanf("%c%c%c", &a, &b, &c) != EOF){
                                          ^
0_0_31940315_30797.cpp:4:17: error: 'getchar' was not declared in this scope
         getchar();
                 ^
0_0_31940315_30797.cpp:25:37: error: 'printf' was not declared in this scope
         printf("%c %c %c\n", a, b, c);
                                     ^


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