编辑代码

#include <stdio.h>
int main () {
    int a[10]={0,23,56,6,87,24,16,19,21,29};
    a[0]=30;
    int i=9;
    while(a[i]!=30)
    {i--;}
    printf("24下标是%d\n",i);

return 0;
}