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;
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 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)
{
    int a;
    for(a=0;a<n;a++)
        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==1)
    {
    printf("%c",symbol);
    }
    else
    {
    printSymbol(n-1,symbol);
        printf("%c",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)
{
    long long result;
    if(n==0)
     result=0;
     else 
     result=2*fun(n-1)+1;
     return result;
}

 

#include<stdio.h>
#include<math.h>
int isPrime(int n);
int main()
{
 int n,sum=0;
 for(n=101;n<=200;n++)
   {
       if(isPrime(n)==0)
          {
        printf("%d",n);
           sum++;
           if(sum%10==0)
           printf("\n");
          }
   }
    printf("\n101~200之间一共有%d个非素数",sum);
   return 0;
}
int isPrime(int n)
{
    int t;
    for(t=2;t<=sqrt(n);t++)
    
      if(n%t==0)
       return 0;

           return 1;
    
}

 

#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)
{
    long t=0,k,i=1;
    while(s!=0)
    {
        k=s%10;
        if(k%2!=0)
        {
        t=t+k*i;
        i*=10;
        }
        s/=10;
    }
    return t;
    
}

 

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