#include <stdio.h>int x = 77;void fn1(){??? printf("fn1(): x=%d\n", x);????? ?}int main(){??? int x = 10;??? if(x>0)??? {???? int?? x = 100;??????? x /= 2;??????? printf("if語句內, x=%d\n", x);????? ???? }??? printf("main方法內, x=%d\n", x);??? fn1();??? return 0;}最下面的fn1();是干嘛的額？