2.1 first.c

#include <stdio.h>
int main(void)                /* 一個簡單的C程式       */
{
    int num;                  /* 定義一個名為num的變數 */
    num = 1;                  /* 為num賦一個值        */
    printf("I am a simple "); /* 使用printf函式（）   */
    printf("computer.\n");
    printf("My favorite number is %d because it is first.\n",num);
    
    return 0;
}
 

2.2 fathm_ft.c

// fathm_ft.c -- 把2英尋轉換成英尺

#include <stdio.h>
int main(void)
{
    int feet, fathoms;
    
    fathoms = 2;
    feet = 6 * fathoms;
    printf("There are %d feet in %d fathoms!\n", feet, fathoms);
    printf("Yes, I said %d feet!\n", 6 * fathoms);
    
    return 0;
}

 

2.3 two_func.c

/* two_func.c -- 一個檔案中包含兩個函式 */
#include <stdio.h>
void butler(void);      /* ANSI/ISO C 函式原型 */
int main(void)
{
    printf("I will summon the butler function.\n");
    butler();
    printf("Yes. Bring me some tea and writeable DVDs.\n");
    
    return 0;
}

void butler(void)       /* 函式定義開始 */
{
    printf("You rang, sir?\n