c语言while循环控制循环次数操作不同写法的结束变量差异

#include <stdio.h>

int main(void)
{
    int i;
    puts("please input an integer.");
    printf("i = "); scanf("%d", &i);
    
    while (i > 0)
    {
        putchar(‘*‘);
        i = i - 1;
    }
    putchar(‘\n‘);
    printf("%d", i);
    return 0;
 } 

## i 结束为 0.

#include <stdio.h>

int main(void)
{
    int i;
    puts("please input an integer.");
    printf("i = "); scanf("%d", &i);
    
    while ( i-- > 0)
    {
        putchar(‘*‘);
    }
    putchar(‘\n‘);
    printf("%d", i);
    return 0;
}

## i 结束为 -1.