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# 实验4

1周前 (04-29) 5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); // 函数声明
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;
}
// 函数定义
long long fac(int n) {
static long long p = 1;
printf("p = %lldn", p);
p = p*n;
return p;
}```

```#include<stdio.h>
int func(int, int);

int main() {
int k=4,m=1,p1,p2;

p1 = func(k,m) ;
p2 = func(k,m) ;
printf("%d,%dn",p1,p2) ;

return 0;
}
int func(int a,int b) {
static int m=0,i=2;

i += m+1;
m = i+a+b;

return (m);
}```

```#include <stdio.h>
#include <stdlib.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];

scanf("%d",&n);
scanf("%d",&m);

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]);

return 0;
}```

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

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]);
}

}```