WEEK6 作业

1、

#include "stdio.h"
main(){
	int x;    
	 printf("输入一个整数：");    
	scanf("%d",&x);   
	 printf("%o %x %d",x,x,x);
}

2、

#include "stdio.h"
main(){    
	float x;    
	 printf("please input:");    
	scanf("%f",&x);    
	 printf("%8.3f",x);
	 printf("%09.3f",x);    
}

3、

#include "stdio.h"
main(){    
	int x;    
	  printf("please input:");    
	scanf("%d",&x);    
	if (x>-1&&x<10)    
	  printf("ok");    
	else    
	  printf("not ok");
}

4、

#include "stdio.h"
main(){    
	int x;    
	 printf("please input:");    
	scanf("%d",&x);    
	if(x>1000)    
	 printf("big");    
	if(x>=100&&x<=1000)    
	 printf("middle");    
	if(x<100)    
	 printf("small");
}

5、

#include "stdio.h"
main(){    
	int a;    
	printf("please input:");    
	scanf("%d",&a);    
	switch(a)   
	 {    
	 	case 1:printf("January\n");break;    
	 	case 2:printf("February\n");break;    
	 	case 3:printf("March\n");break;    
	 	case 4:printf("April\n");break;    
	 	case 5:printf("May\n");break;    
	 	case 6:printf("June\n");break;    
	 	case 7:printf("July\n");break;    
	 	case 8:printf("August\n");break;    
	 	case 9:printf("September\n");break;    
	 	case 10:printf("Optober\n");break;    
	 	case 11:printf("November\n");break;    
	 	case 12:printf("December\n");break;    
	 	default :printf("not valid month number");
 }}            

6、

#include "stdio.h"
main()
   {  int a;    
	  int sum=0;    
	  for(a=2;a<=100;a=a+2)    
	  sum=sum+a;    
	  printf("sum is %d",sum);   
 }              

7、

#include "stdio.h"
void main()
{
    int a,b;
    b=0;
    a=2;
    while(a<=100)
    {
    	b=b+a;
        a=a+2;
     }
    printf("%d",b);
}

8、

#include "stdio.h"
void main()
{
    int a,b;
    a=2;
    b=0;
    do{
     b=b+a;
     a=a+2;
    }while(a<=100);
     
     printf("%d",b);
}