week6 练习

/* Note:Your choice is C IDE */
#include "stdio.h"
main()
{   int i=2;
	int sum=0;
	do
	{   sum+=i;
		i+=2;}
	while(i<=100);
	printf("%d",sum);
    
}


/* Note:Your choice is C IDE */
#include "stdio.h"
main()
{   int i=2;
	int sum=0;
	while(i<=100)
	{sum+=i;
	i+=2;}
	printf("%d",sum);
	

    
}


/* Note:Your choice is C IDE */
#include "stdio.h"
main()
{   int i;
	int sum=0;
	for(i=2;i<=100;i=i+2)
	sum+=i;
	printf("%d",sum);
    
}



/* Note:Your choice is C IDE */
#include "stdio.h"//not?valid?month?number
main()
{     int i;
	printf("input a number:");
	scanf("%d",&i);
	switch(i)
	{   case(1):printf("January");break;
		case(2):printf("Febuary");break;
		case(3):printf("March");break;
		case(4):printf("April");break;
		case(5):printf("May");break;
		case(6):printf("June");break;
		case(7):printf("July");break;
		case(8):printf("Augest");break;
		case(9):printf("September");break;
		case(10):printf("October");break;
		case(11):printf("Novomber");break;
		case(12):printf("Decsember");break;
		default:printf("not valid month number");}
	
    
}


/* Note:Your choice is C IDE */
#include "stdio.h"
main()
{   int i;
	printf("please input a number:  ");
	scanf("%d",&i);
	if (i>1000)
	printf("big");
	if(i<100)
	printf("small");
	else printf("middle");
    
}

/* Note:Your choice is C IDE */
#include "stdio.h"
main()
{    int i;
	printf("input a number:");
	scanf("%d",&i);
	if(i>-1&&i<10)
	printf("OK");
	else printf("not ok");
    
}


/* Note:Your choice is C IDE */
#include "stdio.h"
main()
{   float i;
	printf("please input a number: ");
	scanf("%f",&i);
	printf("%8.4f\n",i);
	printf("%09.3f\n",i);
	
    
}

/* Note:Your choice is C IDE */
#include "stdio.h"
void main()
{   int i;
	printf("please input a number : ");
	scanf("%d",&i);
	printf("%d\n",i);
	printf("%o\n",i);
	printf("%x\n",i);
    
}