第五次作业

1.

#include<stdio.h>
main()
{
    int mark;
    printf("请输入学生的分数(0-100):\n");
    scanf("%d",&mark);
    switch(mark/10)
    {
    case 10:   //与case 9:共同用同一条语句
    case 9:printf("A\n");
    case 8:printf("B\n");
    case 7:printf("C\n");
    case 6:printf("D\n");
    default:printf("NO PASS!\n");
    }
}

 

 
2.

#include<stdio.h>
main()
{
    float x,y;
    printf("请输入x的值:\n");
    scanf("%f",&x);
    if(x>0)
        y=x*x+1;
    else if(x==0)
        y=0;
    else
        y=-x*x+1;
    printf("x=%f\ny=%f\n",x,y);
}

 

 3.

#include<stdio.h>
main()
{
    float n1,n2;
    char sign;
    printf("请输入计算的表达式:\n");
    scanf("%f%c%f",&n1,&sign,&n2);
    switch(sign){
    case  '+':printf("n1+n2=%f\n",n1+n2);break;
    case  '-':printf("n1-n2=%f\n",n1-n2);break;
                case  '*':printf("n1*n2=%f\n",n1*n2);break;
                case  '/':printf("n1/n2=%f\n",n1/n2);break;
    }
}

 

 4.

#include<stdio.h>
main()
{
    int year;
    scanf("%d",&year);//输入年份
    if(year%400==0||(year%4==0&&year%100!=0))
        printf("是闰年\n");
    else printf("不是闰年\n");//输出结果
    return 0;
}

 

 

5.

 #include<stdio.h>
main()
{
    float a,b,c,min;
    scanf("%f%f%f",&a,&b,&c);
    min=a<b?a:b;
    min=min<c?min:c;
    printf("Min:%f\n",min);
}

 

6.

#include<stdio.h>
main()
{
    int m;
    scanf("%d",&m);
    if(m%4==0&&m%6==0)
        printf("Yes\n");
    else printf("No\n");
}