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# 实验四

2周前 (04-29) 7次浏览
```#include<stdio.h>
long long fun(int n);

int main(){
int n;
long long f;

while(scanf("%d", &n) != EOF){
f = fun(n);
printf("n = %d, f = %lldn", n, f);
}

return 0;
}

long long fun(int n){
if(n == 1)
return 1;
else
return 2*(fun(n-1)+1)-1;
}
```

```#include<stdio.h>
long long fac(int n);

int main(){
int i, n;

printf("Enter n:");
scanf("%d", &n);

for(i=1;i<=n;++i)
printf("%d! = %lldn", i, fac(i));

return 0;
}

long long fac(int n){
static long long p = 1;

p = p*n;

return p;
}
```

```#include<stdio.h>
long long fac(int n);

int main(){
int i, n;

printf("Enter n:");
scanf("%d", &n);

for(i=1;i<=n;++i)
printf("%d! = %lldn", i, fac(i));

return 0;
}

long long fac(int n){
static long long p = 1;
printf("p = %lldn", p);
p = p*n;
return p;
}
```

实验三

```#include<stdio.h>
#define N 1000

int fun(int n, int m,int bb[N]) {
int i, j, k=0,flag;

for(j=n;j<=m;j++){
flag = 1;
for(i=2;i<j;i++)
if(j % i == 0){
flag = 0;
break;
}
if(flag == 1)
bb[k++] = j;
}
return k;
}

int main(){
int n=0, m=0, i, k, bb[N];

while(scanf("%d %d",&n, &m) != EOF){

for(i=0;i<m-n;i++)
bb[i] = 0;

k=fun(n,m,bb);

for(i=0;i<k;i++)
printf("%4d",bb[i]);
printf("n");
}

return 0;
}
```

实验四

```#include <stdio.h>
void dec2n(int x, int n);

int main() {
int x;

printf("输入一个十进制整数: ");
scanf("%d", &x);

dec2n(x, 2);
dec2n(x, 8);
dec2n(x,16);
return 0;
}

void dec2n(int x, int n) {
int i,a,N;
char b[100];

for(i=0;x!=0;i++){
b[i] = x % n;
x =  x / n ;
}
if(b[i]>9)
switch(b[i])
{
case 10:b[i]='A';break;
case 11:b[i]='B';break;
case 12:b[i]='C';break;
case 13:b[i]='D';break;
case 14:b[i]='E';break;
case 15:b[i]='F';break;
}

printf("%2d进制：", n);
for(N=i-1;N>=0;N--)
printf("%X" ,b[N]);
printf("n");

}
```