使用教材
《“笨办法” 学C语言(Learn C The Hard Way)》
https://www.jianshu.com/p/b0631208a794
- 完整源码 : learn-c-the-hard-way-lectures/ex24/
https://github.com/zedshaw/learn-c-the-hard-way-lectures/tree/master/ex24
完整源码 ex24.c
#include <stdio.h>
#include "dbg.h"
#define MAX_DATA 100
typedef enum EyeColor {
BLUE_EYES, GREEN_EYES, BROWN_EYE,
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, stdin);
check(in != NULL, "Failed to read first name");
printf("What's your Last Name? ");
in = fgets(you.last_name, MAX_DATA-1, stdin);
check(in != NULL, "Failed to read last name");
printf("How old are you?");
int rc =fscanf(stdin, "%d", &you.age);
check(rc > 0, "You have to enter a number.")
printf("What color are your eyes:\n");
for(i = 0;i <= OTHER_EYES; i++) {
printf("%d) %s\n",i+1, EYE_COLOR_NAMES[i]);
}
printf("> ");
int eyes = -1;
rc = fscanf(stdin, "%d", &eyes);
check(rc > 0, "You have to enter a number");
you.eyes = eyes -1;
check(you.eyes <= OTHER_EYES && you.eyes >= 0, "Do it right , that's not an option.");
printf("How much do you make an hour? ");
rc = fscanf(stdin, "%f", &you.income);
check(rc > 0, "Enter a floating point number");
printf("------ RESULTS ------ \n");
printf("First Name: %s", you.first_name);
printf("Last Name: %s", you.last_name);
printf("Age: %d\n", you.age);
printf("Eyes: %s\n", EYE_COLOR_NAMES[you.eyes]);
printf("Icome: %f\n", you.income);
return 0;
error:
return -1;
}
Makefile
CC=clang
clean:
rm ex24
运行
$ make ex24
clang ex24.c -o ex24
$ ls
dbg.h ex24 ex24.c Makefile
$ ./ex24
What's your First Name? Zed
What's your Last Name? Shaw
How old are you?37
What color are your eyes:
1) Blue
2) Green
3) Brown
4) Black
5) Other
> 1
How much do you make an hour? 1.2345
------ RESULTS ------
First Name: Zed
Last Name: Shaw
Age: 37
Eyes: Blue
Icome: 1.234500
说明
使用 fgets
in = fgets(you.first_name, MAX_DATA-1, stdin);
typedef + struct
typedef DEFINITION
IDENTIFIER
;
typedef struct [STRUCT_NAME] {
ELEMENTS;
}IDENTIFIER
;
I/O 函数
https://zh.cppreference.com/w/cpp/io/c/fscanf
https://zh.cppreference.com/w/cpp/io/c/fgets
https://zh.cppreference.com/w/cpp/io/c/fopen
https://zh.cppreference.com/w/cpp/io/c/freopen
https://zh.cppreference.com/w/cpp/io/c/fdopen
https://zh.cppreference.com/w/cpp/io/c/fclose
https://zh.cppreference.com/w/cpp/io/c/fcloseall
https://zh.cppreference.com/w/cpp/io/c/fgetspos
https://zh.cppreference.com/w/cpp/io/c/fseek
https://zh.cppreference.com/w/cpp/io/c/ftell
https://zh.cppreference.com/w/cpp/io/c/rewind
https://zh.cppreference.com/w/cpp/io/c/fprintf
https://zh.cppreference.com/w/cpp/io/c/fwrite
https://zh.cppreference.com/w/cpp/io/c/fread
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