素数查找功能的程序，适用于C语言。质数（prime number）又称素数，有无限个。质数定义为在大于1的自然数中，除了1和它本身以外不再有其他因数，这样的数称为质数(The prime search function program is suitable for C language. Prime number, also known as prime number, there are infinite. The prime number is defined as a natural number greater than 1, except that there is no other factor other than 1 and its own, and such numbers are called prime numbers)