#include <stdio.h>
#define NAMESIZE 30

struct data{
    float amount;
    char fname[NAMESIZE];
    char lname[NAMESIZE];
} rec;

int main(void)
{
    printf("Enter the donor's first and last names,\n");
    printf("separated by a space:");
    scanf_s("%s %s", &rec.fname, &rec.lname);

    printf("Enter the donation amount:");
    scanf_s("%f", &rec.amount);

    printf("\nDonor %s %s gave $%.2f.\n", rec.fname, rec.lname, rec.amount);

    return 0;
}

[此贴子已经被作者于2016-9-7 17:26编辑过]

scanf_s需要有长度参数

#include <stdio.h>
#define NAMESIZE 30

struct data {
    float amount;
    char fname[NAMESIZE];
    char lname[NAMESIZE];
} rec;

int main(void)
{
    printf("Enter the donor's first and last names,\n");
    printf("separated by a space:");
    scanf_s("%s%s", rec.fname, NAMESIZE, rec.lname, NAMESIZE);

    printf("Enter the donation amount:");
    scanf_s("%f", &rec.amount);

    printf("\nDonor %s %s gave %.2f.\n", rec.fname, rec.lname, rec.amount);

    return 0;
}

你太棒了！解决了我的问题。非常感谢。

就是scanf-s这个格式不对吧.