红色标记四行代码是什么意思?
有能看懂解释一下吗??
#include <stdio.h>
void main()
{
int n=0,i=0,mark_max=0,mark_min=0,t=0,max=0;
printf("Please input the array length\n");
scanf("%d", &n);
int DIO[n];
printf("Input %d numbers in order\n", n);
for(i=0;i<n;i++)
{
scanf("%d",(DIO+i));
/* 最值判断 */
if(DIO[i]>DIO[mark_max])
mark_max=i;
else if(DIO[i]<DIO[mark_min])
mark_min=i;
}
max=DIO[mark_max]; //记录最大值数值
t=DIO[mark_min];
DIO[mark_min]=DIO[n-1];
DIO[n-1]=t;
if(max!=DIO[mark_max]) //如果最大值下标已经改变
mark_max=mark_min;
t=DIO[mark_max];
DIO[mark_max]=DIO[0];
DIO[0]=t;
/* 输出修改的数组 */
printf("MAX is exchanged with the first.\nMIN is exchanged with the last.\n");
for(i=0;i<n;i++)
printf("%d ",DIO[i]);
}