下面程序的运行结果是______。#includevoid fun( int *a , int *b ){printf( "%d %d\n" , *a , *b ) ;*a = 2 ; *b = 4 ;}int main( ){int x = 1 , y = 3 ;fun( &y , &x ) ;printf("%d %d\n" ,x , y ) ;return 0 ;}