WEEK6 作业

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

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

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

#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");
}

#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");
}}

#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);
}

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

#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);
}