实验四 函数和数组应用编程

#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=%lld\n",n,f);
    }
    
    return 0;
}



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

#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! = %lld\n", i, fac(i)); 
    
    return 0;
}


long long fac(int n) {
    static long long p = 1;
    
    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,%d\n",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>
#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!=0) 
           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); 

int main() 
{
    int x;
    
    printf("输入一个十进制整数: ");
    scanf("%d", &x);
    
    dec2n(x, 2);   // 函数调用: 把x转换成二进制输出 
    dec2n(x, 8);     // 函数调用: 把x转换成八进制输出
    dec2n(x, 16);    // 函数调用: 把x转换成十六进制输出
    
    return 0;
}

 
void dec2n(int x, int n) 
{
    int c=0,bb[1000];
    int a,i;
    
    while(x!=0)
{
    a=x%n;
    bb[c]=a;
    x=x/n;
    c++;
    if(a>10)
    
        switch(bb[c])
        {
            case 10:bb[c]=‘A‘;
            break;
            case 11:bb[c]=‘B‘;
            break;
            case 12:bb[c]=‘C‘;
            break;
            case 13:bb[c]=‘D‘;
            break;
            case 14:bb[c]=‘E‘;
            break;
            case 15:bb[c]=‘F‘;
            break;
            
        }}
        for(i=c-1;i>=0;i--)
        printf("%d",bb[i]);
        printf("\n");