int number

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);

}