清明节作业

/*输出月份*/

#include"stdio.h"
intmain()
{

inta;
scanf("%d",&a);
switch(a)
{
case1:printf("%dJanuary\n",a);break;
case2:printf("%dFebruary\n",a);break;
case3:printf("%dMarch\n",a);break;
case4:printf("%dApril\n",a);break;
case5:printf("%dMay\n",a);break;
case6:printf("%dJune\n",a);break;
case7:printf("%dJuly\n",a);break;
case8:printf("%dAugust\n",a);break;
case9:printf("%dSeptember\n",a);break;
case10:printf("%dOctorber\n",a);break;
case11:printf("%dNovember\n",a);break;
case12:printf("%dDecember\n",a);break;
default:printf("notvalidmonthnumber\n");

}
}

#include"stdio.h"
intmain()
{floata;
scanf("%f",&a);
printf("%8.4f\n",a);
printf("%09.3f",a);

}

#include"stdio.h"
intmain()
{inti=0,sum=0;
while(i<=100)
{
sum+=i;
i++;
}
printf("%d",sum);
}

#include"stdio.h"
intmain()
{inti,sum=0;
for(i=0;i<=100;i++)
{

sum=sum+i;

}

printf("%d",sum);

}

#include"stdio.h"
main()
{

intx;
scanf("%d",&x);
if(-1<x&&x<10)

or

if(x<=1||x>=9)
{printf("ok");}
else
{printf("notok");}

}