1题#include "stdio.h"
main()
{
int n,i;
float sum=0,t,a=1.0,b=1;
printf("please input n:");
scanf("%d",&n);
for(i=0;i<n;i++)
{
t=a/b;
sum+=t;
b=b+2;
}
printf("sum=%f\n",sum);
}
2题#include "stdio.h"
#include"math.h"
main()
{
int n,bai,shi,ge;
while(1)
{
printf("please input n:");
scanf("%d",&n);
bai=n/100;
if(bai<=0||bai>=10)
printf(" inpur error\n");
else
break;
}
shi=n%100/10;
ge=n%10;
if(n=pow(bai,3)+pow(shi,3)+pow(ge,3))
printf("%d is right\n",n);
}
3题#include "stdio.h"
#include"math.h"
main()
{
int n,s=0,tn,i,j;
printf("please input n(n<8):");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
tn=1;
for(j=1;j<=i;j++)
tn=tn*j;
s=s+tn;
}
printf("s=%d\n",s);
}
4题#include "stdio.h"
#include"math.h"
main()
{
int n;
printf("please input n:");
scanf("%d",&n);
if(n%5==0&&n%7==0)
printf("5 and 7 yes\n");
else if(n%3==0)
printf("3 yes\n");
else
printf("no\n");
}
5题#include "stdio.h"
#include"math.h"
main()
{
int i,j,a[10],t;
printf("please input 10 numbers\n");
for(i=0;i<10;i++)
scanf("%d",&a[i]);
printf("\n");
for(i=0;i<10;i++)
printf("%-3d",a[i]);
printf("\n");
for(i=0;i<9;i++)
for(j=i+1;j<10;j++)
if(a[i]<a[j])
{
t=a[i];
a[i]=a[j];
a[j]=t;
}
for(i=0;i<10;i++)
printf("%-3d",a[i]);
printf("\n");
}
6题#include "stdio.h"
#include"math.h"
main()
{
int a,b,sum,wan,qian;
printf("please input a and b:");
scanf("%d%d",&a,&b);
sum=pow(a,2)+pow(b,2);
if(sum>100)
{
wan=sum/10000;
qian=sum%10000/1000;
if(wan>0)
{
printf("wan=%2d\n",wan);
printf("qian=%2d\n",qian);
}
else if(qian>0)
printf("qian=%2d\n",qian);
}
else
printf("sum=%d\n",sum);
}
7题你自己仿照前面做
8题
#include "stdio.h"
#include"string.h"
main()
{
int i,l,num=0;
char str[100];
printf("please input a string:\n");
gets(str);
l=strlen(str);
for(i=0;i<l;i++)
{
if(str[i]>=48&&str[i]<=57)
num++;
}
printf("num=%d\n",num);
}
9题#include "stdio.h"
#include"string.h"
main()
{
int num=0,l,i;#include "stdio.h"
#include"string.h"
main()
{
float a[15],average,t;
int i;
printf("please input 15 float numbers:\n");
for(i=0;i<15;i++)
scanf("%f",&a[i]);
printf("your input are:\n");
for(i=0;i<15;i++)
printf("%f",&a[i]);
for(i=0;i<15;i++)
{
t=a[i]/15;
average+=t;
}
printf("average=%f",average);
}
char str[100];
printf("please input a string:");
gets(str);
l=strlen(str);
for(i=0;i<l;i++)
{
if(str[i]>=48&&str[i]<=57)
num++;
}
printf("num=%d\n",num);
}
绝对原创！BS抄袭！