0_0_32034766_19930.cpp:2:11: error: '::main' must return 'int'
void main() {
^
0_0_32034766_19930.cpp: In function 'int main()':
0_0_32034766_19930.cpp:4:37: error: 'scanf_s' was not declared in this scope
while (scanf_s("%c%c%c", &a, &b, &c) != EOF) {
^
|