1.教材p52  例4-8 分数转成等级 switch

#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:
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");

}
}

#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-10;
printf("x=%f\ny=%f\n",x,y);
}

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

#include<stdio.h>
main()
{
int a;
scanf("%d",&a);
if(a%400==0||(a%4==0&&a%100!=0)){
printf("%d是闰年!\n",a);
}else{
printf("%d不是闰年!\n",a);
}
}

#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);
}

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