初学C语言，有个小问题求大佬解答。关于scanf问题。

ErTian

#include <stdio.h>
int main(void)
{
    float fl_num;

    printf("Enter a floating-point value:");
    scanf("%f\n", &fl_num);
    printf("fixed-point notation: %f\n", fl_num);
    printf("exponential notation: %e\n", fl_num);
    printf("p notation: %a\n", fl_num);

    return 0;
}


这个是我的代码。
为什么在scanf这一行中%f后面加上换行，需要这样输入才会展示出结果，
Enter a floating-point value:64.25
1   
fixed-point notation: 64.250000
exponential notation: 6.425000e+01
p notation: 0x1.01p+6

难道不应该是输入64.25后变成这样吗
Enter a floating-point value:64.25


fixed-point notation: 64.250000
exponential notation: 6.425000e+01
p notation: 0x1.01p+6