c - 将数字打印到可变的小数位

Question

我想在 C 中打印一个小数位数可变的数字。我写了代码

#include<stdio.h>
main()
    {   int a;
        printf("Upto which number of decimal places you want to print value of '2.554648' ?");
        scanf("%d", &a);
        printf("Value of '2.554648 upto %d number of decimal places = %.af", a, 2.554648);
        return 0;
    }

Answer 1

在printf()中使用*标记您想要的小数位数:

#include <stdio.h>

int main(void)
{
    int a;

    printf("Upto which number of decimal places you want to print value of '2.554648' ?");
    scanf("%d", &a);
    printf("Value of '2.554648 upto %d number of decimal places = %.*f", a, a, 2.554648);

    return 0;
}