1*4882a593Smuzhiyun #include <stdio.h> 2*4882a593Smuzhiyun main(void)3*4882a593Smuzhiyun int main(void) 4*4882a593Smuzhiyun { 5*4882a593Smuzhiyun printf("Hello world!\n"); 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun return 0; 8*4882a593Smuzhiyun } 9