胡明浩 160809313 （我就会三个）

#include<stdio.h>
int main()//打印三角形 
{
    int i,j;
    for(j=1;j<=10;j++)
    {
        for(i=1;i<=11-j;i++)
        {
            printf("*");
        }
        printf("
");
    }

#include <stdio.h>
int main()//五级制成绩分布 
{
    int i,A,B,C,D,E,n,s;
    A=B=C=D=E=0;
    printf("Enter n:");
    scanf("%d",&n);
    for(i=0;i<n;++i)
    {
        printf("Enter grade %d:",i+1);
        scanf("%d",&s);
        switch(s/10)
        {
        case 1:
        case 2:
        case 3:
        case 4:
        case 5:E++;break;
        case 6:D++;break;
        case 7:C++;break;
        case 8:B++;break;
        case 9:
        case 10:A++;break;
        }
    }
    printf("The number of A(90~100):%d
",A);
    printf("The number of B(80~89):%d
",B);
    printf("The number of C(70~79):%d
",C);
    printf("The number of D(60~69):%d
",D);
    printf("The number of E(0~59):%d
",E);
    return 0;

#include<stdio.h>
int main()//高速公路限速处罚
{
    int x,y;
    scanf("%d %d",&x,&y);
    double b = (double)(x-y)*100/y;
    if (b>50)printf("超过限速 %.0f%%. 吊销执照",b);
    if(b>=10&&b<=50)printf("超出限速 %.0f%%. 罚款 200",b);
    if(b<10)printf("未超过限速");
}