C语言-printf()和scanf()中*的作用

printf()中*的作用

在printf()中*充当变量的占位符

/*使用变量控制输出字符宽度*/
#include <stdio.h>
int main(void)
{
    unsigned width,precision;
    int number = 256;
    double weight = 243.67;

    printf("Enter a field width:\n");
    scanf("%d",&width);
    printf("The number is :%*d\n",width,number);
    printf("Enter a width and a precision:\n");
    scanf("%d%d",&width,&precision);
    printf("weight = %*.*f\n",width,precision,weight);

    return 0；
}

运行示例

scanf()中*的作用

把*放在%和转换字符之间时，会使得scanf()跳过相应的输入项。

\*跳过输入中的整数*\
#include <stdio.h>
int main(void)
{
    int n;

    printf("please input three integers:\n");
    scanf("%*d,%*d,%d",&n);
    printf("the last integer is :%d\n",n);

    return 0；
}

运行示例