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Right, the #include<stdio.h> is very important.

#include<stdio.h>
int main(){
  printf("Hello world!\n") ;
}
What do you suppose the int main() does? #Shuffle: none $PAGE$-A $PAGE$-B $PAGE$-C Learn C Introduction #: Something about interrupts. #: The empty parenthesis refer to the meaninglessness of existence. #: It's has something to do with how Unix runs a user's program by calling the function main and receiving, when main exists, an integer return code. #: