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个学生考完期末试评卷成后,老师需要划出及格线，求如下:
(1)及格线是 10 的倍数
(2)保证至少有60%的学生及格；
(3)如果所有的学生都高于60分,则及格线为 60 分
输入10个整数：取值0~100
输出及格分数线，10的倍数
**********************************************************************/
#include<stdio.h>
#include<stdlib.h>int comp(const void* a, const void* b)
{return *((int*)a) - *((int*)b);
}
int makesurePassLine(int* arr, int length)
{if(arr ==NULL || length<=0)return -1;int result = -1;qsort(arr,10,sizeof(int),comp);for(int i=0; i<length; ++i){printf("%d\t",arr[i]);}if(arr[0] > 60)result = 60;else if(arr[4]%10 == 0)result = arr[4];elseresult = arr[4]/10*10;return result;
}void test()
{const int length = 10;int arr[10] ={61,51,49,30,20,10,70,80,90,99};int passLine = makesurePassLine(arr,length);printf("%d\n",passLine);
}void test1()
{const int length = 10;int arr[10] ={61,70,89,70,80,90,80,80,90,99};int passLine = makesurePassLine(arr,length);printf("%d\n",passLine);
}
int main()
{test();test1();return 0;
}