ch27-19.c

C语言程序设计上机指导与练习 冶金工业出版社 刘怀亮

#include <stdio.h>
int cnt,sum;
int isPrime(int number)
{
   int i,tag=1;
   for(i=2;tag && i<=number/2; i++)
      if(number % i ==0) tag =0;
   return tag;
}
void countValue()
{
   int i;
   for(i=2;i<=90;i++)
      if(isPrime(i)&&isPrime(i+4)&&isPrime(i+10))
      {cnt++;sum+=i;}
}
writeDat()
{
   FILE *fp;
   fp=fopen("out.dat","w");
   fprintf(fp,"%d\n%d\n",cnt,sum);
   fclose(fp);
}
void main()
{
   cnt=sum=0;
   countValue();
   printf("满足条件的整数的个数＝%d\n",cnt);
   printf("满足条件的整数的和值＝%d\n",sum);
   writeDat();
}