int number;
printf(“请输入一个正整数:\n”);
scanf(“%d”,&number);
if (prime(number))
printf(“\n %d是素数.”,number);
else
printf(“\n %d不是素数.”,number);
}
int prime(number) /*此函数用于判别素数*/
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int number;
{
int flag=1,n;
for(n=2;n<number/2&&flag==1;n++)
if (number%n==0)
flag=0;
return(flag);
}