第5次作业

#include<stdio.h>
main(){
int mark;
printf("输入分数:\n");
scanf("%d",&mark);
switch(mark/10)
{
case 10:
case 9:printf("A\n");break;
case 8:printf("B\n");break;
case 7:printf("C\n");break;
case 6:printf("D\n");break;
default:printf("no pass!)\n");
}
}

 

 

 

 

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

 

 

#include<stdio.h>
main(){
int y;
printf("输入年份:");
scanf("%d",&y);
if(y%4==0&&y%100!=0||y%400==0){
printf("是闰年");
}else{
printf("是平年");
}

}

 

#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");
}