section1：
#include<stdio.h>
int main()
{
int i,d,w;
printf("Please input a number");
scanf("%d",&i);
w=i/7;
d=i%7;
printf("%d days is %d weeks and %d days",i,w,d);
}
section2：
#include<stdio.h>
int main()
{
int i,j;
printf("Please input grade\n");
scanf("%d",&i);
j=i/10;
switch(j)
{
case 10:printf("A\n");break;
case 9:printf("A\n");break;
case 8:printf("B\n");break;
case 7:printf("C\n");break;
case 6:printf("D\n");break;
default :printf("Full\n");break;
}
}
section3：
#include<stdio.h>
int main()
{
int i,j,k=1,t=0;
printf("Please input a number for 'n': \n");
scanf("%d",&j);
for(i=1;i<=j;i++)
{
k=i*k;
t=t+k;
}
printf("The sum is :%d\n",t);
}
section4：
#include<stdio.h>
int main()
{
int i,j,z,x,k=0,l=0,t,n,m;
int a[100],b[100],c[100];
for(i=10;1<=99;i++)
{
for(j=2;j<=i/2;j++)
{
if(i%j==0)break;
}
if(j>i/2)
{
a[k]=j;k++;
}
}
for(t=0;t<=k;t++)
{
n=a[t]/10;
m=a[t]%10;
b[t]=m*10+n;
}
for(z=0;z<=t;z++)
{
for(x=0;x<=b[z]/2;x++)
{
if(b[z]%x!=0)break;
}
if(x>b[z]/2)
{
c[l]=b[z];l++;
}
}
for(i=0;i<=l;i++)
{
printf("%4d\n",c[i]);
}
}
section5：
#include<stdio.h>
int main()
{
int a[10],i,j,k=0,z=0;
printf("Please input 10 number for a[10]!\n");
for(i=0;i<=9;i++)
{
scanf("%d",&a[i]);
k=k+a[i];
if(z<a[i])z=a[i];
}
j=k/10;
printf("The sum is %d,the max is %d and the average is %d\n",k,z,j);
}
section6：
#include<stdio.h>
int main()
{
int a[8]={8,5,6,7,1,2,3,4};
int i,j,k,t;
for(i=0,j=7;i<4;i++,j--)
{
k=a[i];a[i]=a[j];a[j]=k;
}
for(i=0;i<8;i++)
{
printf("%d,",a[i]);
}
}
