日常分享代码

#include<stdio.h>
int main()
{
  int n;
  int flag=1;
  int i = 0;
  scanf("%d",&n);
  for(i=2;i<n;i++)
  {
    if(n%i==0)
    {
      flag=0;
      break;
    }  
  }
  if(flag)
  printf("%d is a prime number",n);
  else
    printf("%d is not a prime number",n);
  return 0;
}

#include<stdio.h>
int main()
{
  int m,n,i,sum;
  scanf("%d%d",&m,&n);
  int max=m;
  int min=n;
  if(m<n)
  {
    max=n;
    min=m;
  }
  i=min;
  for(i;i<=max;i++)
  {
    if(i%3!=0)
      continue;
    else
      sum=sum+i;
  }
  printf("The total number is %d",sum);
  return 0;
}