C语言 P120-3-3

#include <stdio.h>
int shu(int a,int b);
main()
{

    printf("%d",shu(23,56));

    getchar();
 }
int shu(int a,int b)
{
    int aa;
    aa=(b%10)*1000+b/10*100+(a%10)*10+a/10;
    return aa;
}