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# 作业4

2周前 (04-29) 5次浏览
```#include<stdio.h>
2 long long fun(int n);
3
4 int main(){
5     int n;
6     long long f;
7
8     while(scanf("%d", &n) != EOF){
9         f = fun(n);
10         printf("n = %d, f = %lldn", n, f);
11     }
12
13     return 0;
14 }
15
16 long long fun(int n){
17     if(n == 1)
18     return 1;
19     else
20     return 2*(fun(n-1)+1)-1;
21 }```

```#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>
#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;
}```

```#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, b, a[100];

for(i=0;x!=0;i++){
a[i]=x%n;
x=x/n;
}
if(a[i]>9)
switch(a[i]){
case 10:a[i]='A';break;
case 11:a[i]='B';break;
case 12:a[i]='C';break;
case 13:a[i]='D';break;
case 14:a[i]='E';break;
case 15:a[i]='F';break;
}
printf("n");
for(b=i-1;b>=0;b--){
printf("%d",a[b]);
}
}```