实验二选择结构程序设计

野性酷女 2021-11-22 14:54 207阅读 0赞

（1）

#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;
    }

![1617815-20190425140958586-465650264.png][]

（2）

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

![1617815-20190425142302144-1538448188.png][]

（3）

#include<stdio.h>
    #include<math.h>
    
    int main()
    {
    	int a,b,c;
    	scanf("%d%d%d",&a,&b,&c);
    	if((a+b)>c && (a+c)>b && (b+c)>a)
    	{
    		printf("能构成三角形\n");
    
    	    if((pow(a,2)+pow(b,2)==pow(c,2)) || (pow(a,2)+pow(c,2)==pow(b,2)) || (pow(b,2)+pow(c,2)==pow(a,2)))
    		{
    			printf("直角三角形\n");
    		}
    		if((a==b)||(a==c)||(b==c))
    		{
    			if((a==b)&&(a==c)&&(b==c))
    			{
    				printf("等边三角形\n");
    			}
    			else
    			{
    				printf("等腰三角形\n");
    			}
    		}
    	}
    	else
    	{
    		printf("不能构成三角形\n");
    	}
    
    return 0;
    }

![1617815-20190425145648972-29790116.png][]

![1617815-20190425145658124-67243776.png][]

![1617815-20190425145705175-1760236058.png][]

（4）

#include<stdio.h>
    
    int main()
    {
    	double a,rate,tax,profit;
    	printf("input a:");
    	scanf("%lf",&a);
    	if(a<500)
    	{
    		rate = 0.00;
    		tax = a * rate;
    		profit = a - tax;
    	}
    	else if(a>=500 && a<1000)
    	{
    	    rate = 0.05;
    		tax = a * rate;
    		profit = a - tax;
    	}
    	else if(a>=1000 && a<2000)
    	{
    	    rate = 0.08;
    		tax = a * rate;
    		profit = a - tax;
    	}
    	else if(a>=2000 && a<5000)
    	{
    	    rate = 0.10;
    		tax = a * rate;
    		profit = a - tax;
    	}
    	else if(a>5000)
    	{
    	    rate = 0.15;
    		tax = a * rate;
    		profit = a - tax;
    	}
    
    	printf("%lf\n%lf\n%lf\n",rate,tax,profit);
    
    return 0;
    }

#include<stdio.h>
    
    int main()
    {
    	int c;
    	double a,rate,tax,profit;
    	printf("please enter a:");
    	scanf("%lf",&a);
    	if(a>=5000) c=10;
    	else        c=a/500;
    	switch(c)
    	{
    	case 0: rate=0.00;break;
    	case 1: rate=0.05;break;
    	case 2: 
    	case 3: rate=0.08;break;
    	case 4:
    	case 5:
    	case 6:
    	case 7:
    	case 8:
    	case 9: rate=0.10;break;
    	case 10: rate=0.15;break;
    	}
    
    	tax = a * rate;
    	profit = a - tax;
    	printf("%lf\n%lf\n%lf\n",rate,tax,profit);
    
    return 0;
    }

![1617815-20190425152704106-1419246557.png][]

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转载于:https://www.cnblogs.com/P201821430044/p/10768757.html

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[1617815-20190425145658124-67243776.png]: /images/20211122/f75fcdf6e5ba4b4784abcde98af9cb0b.png
[1617815-20190425145705175-1760236058.png]: /images/20211122/c5d47ef7bf41483e8f72b303c98c6475.png
[1617815-20190425152704106-1419246557.png]: /images/20211122/60eea07496814efdaf0fb6bd2e3048f2.png
[1617815-20190425152719052-728147294.png]: /images/20211122/f11a0c7a192546b48659b0f00e132554.png
[1617815-20190425152730091-762890079.png]: /images/20211122/d67548b96e044457830bda6cd0a2e79c.png
[1617815-20190425152741940-323881992.png]: /images/20211122/1e2513c3aaca4484844989744cfe1f87.png
[1617815-20190425152753364-70733548.png]: /images/20211122/c056261f362c4513b23a8786c8858b14.png