10、C语言编程进阶：输入输出、可变参数与编程思维

C语言编程进阶：输入输出、可变参数与编程思维

1. 输入输出与文件操作

1.1 程序示例

在C语言编程中，我们常常需要进行输入输出操作。下面是一个使用 fscanf 和 fgets 函数来收集用户信息的程序示例：

#include <stdio.h>
#include "dbg.h"

#define MAX_DATA 100

typedef enum EyeColor {
    BLUE_EYES, GREEN_EYES, BROWN_EYES,
    BLACK_EYES, OTHER_EYES
} EyeColor;

const char *EYE_COLOR_NAMES[] = {
    "Blue", "Green", "Brown", "Black", "Other"
};

typedef struct Person {
    int age;
    char first_name[MAX_DATA];
    char last_name[MAX_DATA];
    EyeColor eyes;
    float income;
} Person;

int main(int argc, char *argv[])
{
    Person you = {.age = 0 };
    int i = 0;
    char *in = NULL;

    printf("What's your First Name? ");
    in = fgets(you.first_name, MAX_DATA - 1, s