作业

#include<stdio.h>
int main()
	{ char a,b,c,d,e;
	a = getchar();
	b = getchar();
	c = getchar();
	d = getchar();
	e = getchar();
	putchar(a);
	putchar(b);
	putchar(c);
	putchar(d);
	putchar(e);
	putchar('\n');
	return 0;
	}

　　

#include<stdio.h>
int main(){
    int year,leap;
    printf("input the year:");
    scanf("%d",&year);
    if(year%4==0)
    {
        if(year%100==0)
        {
            if(year%400==0)
                leap=1;
            else
                leap=0;
        }
        else
            leap=1;
    }
    else
            leap=0;
        if(leap)
            printf("year:%d,month:2,days:29",year);
        else
            printf("year:%d,month:2,days:28",year);
        return 0;
    }

#include<stdio.h>
int main(){
    int a,b,c,i;
    i=1;
    scanf("%d",&a);
    scanf("%d",&b);
    scanf("%d",&c);
    if(a+b>c&&b+c>a&&a+c>b)
    {
    if(a==b&&a==c)
    {
        printf("等边三角形\n");
        i=0;
    }
    else if(a==b||a==c||b==c&&i==1)
    {
        printf("等腰三角形\n");
        i=1;
    }
    else if(a*a+b*b==c*c||a*a+c*c==b*b||b*b+c*c==a*a)
    {
        printf("直角三角形\n");
    }
    else
        printf("一般三角形\n");
}
    else
    printf("EOF\n");
    return 0;
}

#include<stdio.h>
int main(){
    double a,rate,tax,profit;
    scanf("%lf",&a);
    if(a<500)
        rate=0.00,tax=0.00,profit=a;
    else
        if(a>=500&&a<1000)
            rate=0.05,tax=0.05*a,profit=0.95*a;
        else
            if(a>=1000&&a<2000)
                rate=0.08,tax=0.08*a,profit=0.92*a;
            else
                if(a>=2000&&a<5000)
                    rate=0.1,tax=0.1*a,profit=0.9*a;
                else
                    if(a>=5000)
                        rate=0.15,tax=0.15*a,profit=0.85*a;
                    printf("a=%.2lf rate=%.2lf tax=%.2lf profit=%.2lf",a,rate,tax,profit);
                    return 0;
}