C语言实验2

#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);
    return 0;
}

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

#include "stdio.h"
#include "math.h"
int main(){
    int a,b,c;
    printf("请输入三角形的三边:");
    scanf("%d%d%d",&a,&b,&c);
    if(a+b<c||a+c<b||b+c<a)
        printf("该三边不能构成三角形!");
    else if(a==b&&b!=c||b==c&&c!=a||a==c&&c!=b&&(pow(a,2)!=pow(b,2)+pow(c,2)||pow(b,2)!=pow(a,2)+pow(c,2)||pow(c,2)!=pow(b,2)+pow(a,2)))
        printf("此三角形为等腰三角形。");
    else if(a==b&&b==c)
        printf("此三角形为等边三角形。");
    else if((pow(a,2)==pow(b,2)+pow(c,2)||pow(b,2)==pow(a,2)+pow(c,2)||pow(c,2)==pow(b,2)+pow(a,2))&&(a!=b&&b!=c&&c!=a))
        printf("此三角形为直角三角形。");
    else if((pow(a,2)==pow(b,2)+pow(c,2)||pow(b,2)==pow(a,2)+pow(c,2)||pow(c,2)==pow(b,2)+pow(a,2))&&(a==b||b==c||c==a))
        printf("此三角形为等腰直角三角形。");
    else printf("此三角形为一般三角形。");
    return 0;
}

#include "stdio.h"
#include "math.h"
double main(){
    double a,rate,tax,profit;
    printf("请输入你的奖金数：");
    scanf("%lf",&a);
    if(a<0)
        printf("请输入正确的奖金数：");
    else if(a<500){
        rate=0.00;
        tax=a*rate;
        profit=a-tax;
        printf("a=%lf,rate=%lf,tax=%lf,profit=%lf",a,rate,tax,profit);}
    else if(a>=500&&a<1000){
        rate=0.05;
        tax=a*rate;
        profit=a-tax;
        printf("a=%lf,rate=%lf,tax=%lf,profit=%lf",a,rate,tax,profit);}
    else if(a>=1000&&a<2000){
        rate=0.08;
        tax=a*rate;
        profit=a-tax;
        printf("a=%lf,rate=%lf,tax=%lf,profit=%lf",a,rate,tax,profit);}
    else if(a>=2000&&a<5000){
        rate=0.10;
        tax=a*rate;
        profit=a-tax;
        printf("a=%lf,rate=%lf,tax=%lf,profit=%lf",a,rate,tax,profit);}
    else if(a>=5000){
        rate=0.15;
        tax=a*rate;
        profit=a-tax;
        printf("a=%lf,rate=%lf,tax=%lf,profit=%lf",a,rate,tax,profit);}
    return 0;
}