C语言：填空题1

#include <stdio.h>
//⑴⑵⑶⑷⑸⑹⑺⑻⑼⑽  
//交换两个整型变量的值 
main()
{
    int a,b;
    scanf("%d%d",&a,&b);
    printf("a=%d,b=%d\n");
    a=⑴;
    b=⑵;
    a=⑶;
    printf("a=%d,b=%d\n");
    getchar();
}