#include<stdio.h>
int main()
{
	int n,i=1,grade,x_1=0,x_2=0,x_3=0,t,n_1=1,n_2=1,n_3=1,a=0,b=0,c=0,d=0;
	//x_1,x_2,x_3為前三名學(xué)生成績(jī)，n_1,n_2,n_3為前三名相應(yīng)人數(shù)，a,b,c,d為每個(gè)成績(jī)等級(jí)學(xué)生數(shù) 
	printf("請(qǐng)輸入學(xué)生人數(shù)：");
	scanf("%d",&n);
	getchar();
	do
	{
		printf("請(qǐng)輸入第%d個(gè)學(xué)生的成績(jī)：",i);
		scanf("%d",&grade);
		getchar();
		if(grade>=90) a++;
		else if(grade>=75&&grade<=89) b++;
		else if(grade>=60&&grade<=74) c++;
		else if(grade>=0&&grade<=59) d++;
		else printf("請(qǐng)輸入正確成績(jī)：");
		if(grade==x_1) n_1++;
 		else if(grade==x_2) n_2++;
	 	else if(grade==x_3) n_3++;
	 	else if(grade>x_3) {x_3=grade;n_3=1;}
		if(x_1<x_2) {t=x_1;x_1=x_2;x_2=t;t=n_1;n_1=n_2;n_2=t;}
		if(x_1<x_3) {t=x_1;x_1=x_3;x_3=t;t=n_1;n_1=n_3;n_3=t;}
		if(x_2<x_3) {t=x_2;x_2=x_3;x_3=t;t=n_2;n_2=n_3;n_3=t;}//將成績(jī)進(jìn)行排序 ,相對(duì)應(yīng)的人數(shù)也要進(jìn)行交換 
		i++;
	}while(i<=n);
	printf("第一名為：%d,有%d名\n",x_1,n_1);
	printf("第二名為：%d,有%d名\n",x_2,n_2);
	printf("第三名為：%d,有%d名\n",x_3,n_3);
	printf("成績(jī)等級(jí)為“優(yōu)”占比為：%.2f\n",a*1.0/n);
	printf("成績(jī)等級(jí)為“良”占比為：%.2f\n",b*1.0/n);
	printf("成績(jī)等級(jí)為“中”占比為：%.2f\n",c*1.0/n);
	printf("成績(jī)等級(jí)為“不及格”占比為：%.2f\n",d*1.0/n);
	return 0;
}

#include <stdio.h>
#include <stdlib.h>
?
int main(int argc, char* argv[])
{
?? ?
?? ?int i , n , j = 0, k = 0;
?? ?int arr[10001] = { 0 };
?? ?scanf("%d", &n);//輸入人數(shù)
?? ?for (i = 0; i < n; i++)
?? ?{
?? ??? ?scanf("%d", &arr[i]);//輸入成績(jī)
?? ??? ?if (arr[i] >= 60)
?? ??? ??? ?j++;
?? ??? ?if (arr[i] >= 85)
?? ??? ??? ?k++;
?? ?}
? int jige=0,youxiu=0;
? jige=j*100.0/n+0.5;//實(shí)現(xiàn)小數(shù)四舍五入
? youxiu=k*100.0/n+0.5;
?
?printf("%d%%\n%d%%", jige,youxiu);輸出含有%的結(jié)果時(shí)要用到%%
?? ?return 0;
}