int jiecheng(int n)
{
if ( n <= 1 )
return 1;
else
return jiecheng(n-1)*n;
}
double funcos(double e, double x)
{
double y, b;
int i, j;
y=0;
i=0;
b=x^i/jiecheng(i);
while(b>=e)
{
y=y+j*x^i/jiecheng(i);
i=i+2;
j=-j;
b=x^i/jiecheng(i);
}
y=y+b;
return y;
}
int main()
{
double ans;
int n;
printf("get n:");
scanf("%d",&n);
ans=jiecheng(n);
printf("ans=%160.159e\n",ans);
return 0;
}
int main()
{
int n,i;
double e;
printf("n e\n- -----------\n0 1\n1 2\n2 2.5\n");
for(n=3; n<=9; n++)
{
e=0;
for(i=0; i<=n; i++)
{
e+=jiecheng(i);
}
printf("%d %.9lf\n",n,e);
}
return 0;
}
double jiecheng(int n)
{
if(n>1)
return n*jiecheng(n-1);
else return 1;
}
int main(int argc, const char *argv[])
{
int num = jiecheng(5);
printf("%d\n", num);
return 0;
}
//5 4 3 2 1
int jiecheng(n) {
if (n==1) {
return 1;
}
return n * jiecheng(n-1) ;
}
int main_( void )
{
printf("%d\n", jiecheng(3));
return 0;
}
void part_three_describe()
{
bool flag=true;
while(flag)
{
cout<<"******************************************"<<endl;
cout<<"* 第三章 ACM程序设计基础 *"<<endl;
cout<<"******************************************"<<endl;
cout<<"*(1) 读入一个参数 *"<<endl;
cout<<"*(2) 读入两个参数 *"<<endl;
cout<<"*(3) 1!到n!的和 *"<<endl;
cout<<"*(4) 等比数列 *"<<endl;
cout<<"*(5) 斐波那契数 *"<<endl;
cout<<"*(6) 最大公约数 *"<<endl;
cout<<"*(7) 最小公倍数 *"<<endl;
cout<<"*(8) 平均数 *"<<endl;
cout<<"*(9) 对称三位素数 *"<<endl;
cout<<"*(10)十进制转化为二进制 *"<<endl;
cout<<"*(11)列出完数 *"<<endl;
cout<<"*(12)12!的配对 *"<<endl;
cout<<"*(13)五位数以内的对称素数 *"<<endl;
cout<<"*(14)01串排序 *"<<endl;
cout<<"*(15)排列对称串 *"<<endl;
cout<<"*(16)按绩点排名 *"<<endl;
cout<<"*(17)按1的个数排序 *"<<endl;
cout<<"******************************************"<<endl;
cout<<"请输入对应的编号进入相应的题目(返回上级输入0):"<<endl;
int num;
cin>>num;
while(num!=0&&num!=1&&num!=2&&num!=3&&num!=4&&num!=5&&num!=6&&num!=7&&num!=8&&num!=9&&
num!=10&&num!=11&&num!=12&&num!=13&&num!=14&&num!=15&&num!=16&&num!=17
){
cout<<"编号不存在"<<endl;
cout<<"请输入对应的编号进入相应的题目(返回上级输入0):"<<endl;
cin>>num;
}
switch(num){
case 0:total_describe();break;
case 1:readANumber();break;
case 2:readTwoNumber();break;
case 3:jiecheng();break;
case 4:dengbi();break;
case 5:fibo();break;
case 6:zuixiaogongyueshu();break;
case 7:zuidagongbeishu();break;
case 8:countAverage();break;
case 9:SymmetricThreeDigit();break;
case 10:tenTransTwo();break;
case 11:listWanshu();break;
case 12:peidui();break;
case 13:SymmetricFiveDigit();break;
case 14:sortForOneZero();break;
//case 3:part_three_describe();break;
//case 4:part_four_describe();break;
}
}
total_describe();
}
