计算范围内素数的代码返回一半的数字

Question

这段代码的某些部分是错误的，我无法弄清楚。我逻辑地编写代码来计算两个给定数字之间的素数，但代码返回给定数字范围的一半。函数工作正常，但 while 循环的逻辑错误

代码:

#include<stdio.h>

int checkPrime(int isItPrime);

int main()
{

    printf("Counting Prime Numbers between twos\nEnter two numbers , the First number must be smaller\n");
    int num1, num2;
    scanf("%d%d", &num1, &num2);
    int count = 0;
    while(num1<num2)
    {
        num1++;
        if(checkPrime(num1)==1)
            count++;
    }
    printf("%d\n", count);

    return 0;
}

int checkPrime(int isItPrime)
{

    int result = 0, j = 2;
    while(result < isItPrime)
    {
        result = (isItPrime%j);
        j++;
        if (result==0)
            return 0;
        else if (result!=0)
            return 1;
    }

}

Answer 1

看看这是否有效，我希望它有效:

 #include<stdio.h>

int checkPrime(int n);

int main()
{

    printf("Counting Prime Numbers between twos\nEnter two numbers , the First number must be smaller\n");
    int num1, num2;
    scanf("%d%d", &num1, &num2);
    int count = 0;
    while(num1<num2)
    {
        num1++;
        if(checkPrime(num1)==1)
            count++;
    }
    printf("%d\n", count);

    return 0;
}
int checkPrime(int n)
{

    if (n <= 1)
        return 0;
    for (int i = 2; i < n; i++)
        if (n % i == 0)
            return 0;

    return 1;
}