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! = %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>
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;
    printf("p = %lld\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 n, char symbol);
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)
{
    for(int j=0;j<n;j++)
    {
        printf("%c",symbol);
     } 
}

 

#include <stdio.h>
void printSymbol(int n, char symbol);
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)
{
    if(n>0)
    {
    printf("%c",symbol);
    n--;
    printSymbol(n,symbol);}
}

 

#include<stdio.h>
#include<math.h>
int isPrime(int a);
int main()
{
    int b;
    for(int m=101;m<=200;m++)
    {
        if(!isPrime(m))
        {
            b++;
            printf("%d",m);
        }
    }
    printf("\n101~200之间一共%d个非素数",b);
    return 0;
}
int isPrime(int a)
{
    int n=0;
    for(int j=2;j<=sqrt(a);j++)
    {
        if(a%j==0) n++;
    }
    if(n==0)
    return 1;
    else
    return 0;
}

 

#include<stdio.h>
#include<math.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 a,b=0;
    long result=0;
    while(s!=0)
    {
        a=s%10;
        if(b%2!=0)
        {
            result=result+a*pow(10,b);
            b=b+1;
        }
        else;
        s=s/10;
    }
    return result;
}

#include <stdio.h>
#include<math.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 j;
    double result=0;
    double a=1;
    for(j=1;j<=n;j++)
    {
        a=a*j;
        result=pow(-1,j-1)*1/a+result;
    }
    return result;
}