程序代码：

#include<stdio.h>
#include<math.h>

void fun(int n);

int main()
{
    int n=0;

    scanf("%d",&n);

    fun(n);

    return 0;
}

void fun(int n)
{
    int s=(int)sqrt(n);

    while (n%s)
        --s;

    printf("%d %d\n",s,n/s);
}

程序代码：

#include <stdio.h>

int main(void)
{
    unsigned int n = 0;
    unsigned int b = 0;

    scanf("%u", &n);    ///< n > 0
    
    b = n;
    while (b * b > n){
        
        b /= 2;
    }
    
    while(true){
            
        if (b * b >= n && n%b == 0){
            
            break;
        }
        ++b;
    }

    printf("%u %u\n", b, n/b);
    return 0;
}

程序代码：

#include <stdio.h>
#include <math.h>

int main(void)
{
    int n;
    do {
        printf("输入像素 n = ");
        scanf("%d", &n);
        if (n < 1 || n>1000000)
            printf("输入像素超出范围，请重新输入。");
    } while (n < 1 || n>1000000);
    int a, b;
    a = b = sqrt(n);

    for (;;)
    {
        if (a*b == n)
            break;
        if (a*b < n)
            b++;
        if (a*b > n)
            a--;
    }

    printf("a = %d\nb = %d\n", a, b);

    return 0;
}