实验3

#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! = %11d\n",i,fac(i));
        
    return 0;
}

long long fac(int n){
    static long long p=1;
    printf("p = %11d\n",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,%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>
void printsymbol(int,char);
int main(){
    int n;
    char symbol;
    
    while(scanf("%d %c",&n,&symbol)!=EOF){
        printsymbol(n,symbol);
        printf("\n");
    } 
    
    return 0;
}

void printsymbol(int n,char symbol){
    int i;
    for(i=1;i<=n;i++)
        printf("%c",symbol); 
}

 

#include <stdio.h>
void printsymbol(int,char);
int main(){
    int n;
    char symbol;
    
    while(scanf("%d %c",&n,&symbol)!=EOF){
        printsymbol(n,symbol);
        printf("\n");
    } 
    
    return 0;
}

void printsymbol(int n,char symbol){
    printf("%c",symbol);
    if(n==1)    ;
    else
        printsymbol(n-1,symbol);
}

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

 

#include<stdio.h>
#include<math.h>
int isprime(int);
int s=0;

int main(){
    int i;
    for(i=101;i<=200;i++){
        if(isprime(i)==1)    ;
        else if(isprime(i)==0){
            s=s+1;
            printf("%5d",i);
        }
    }
    printf("\n一共有%d个非素数",s);
    
    return 0;
} 

 

#include <stdio.h>
long fun(long s); 
int main(){
    long s, t;
    printf("Enter a number: ");
    while (scanf("%ld", &s) != EOF){
        t = fun(s);
        printf("new number is: %ld\n\n", t);
        printf("Enter a number: ");
    }
    return 0;
}

long fun(long s){
    int wei,s1=0,s2=0;
    while(s!=0){
        wei=s%10;
        if(wei%2==1)
            s1=s1*10+wei;
        s=s/10;
    }
    while(s1!=0){
        wei=s1%10;
        s2=s2*10+wei;
        s1=s1/10;
    }
    
    return s2;
} 

 

#include <stdio.h>
double fun(int n); 

int main(){
    int n;
    double s;
    printf("Enter n(1~10): ");
    while (scanf("%d", &n) != EOF){
        s = fun(n);
        printf("n = %d, s= %f\n\n", n, s);
        printf("Enter n(1~10): ");
    }
    return 0;
}

double fun(int n){
    int i;
    double t=-1,s=0;
    for(i=1;i<=n;i++){
        t=-t*i;    
        s=s+1/t;
    }
    
    return s;
}