Programming & Language Telling the computer what to do

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1 Programming & Language Telling the computer what to do
綠園

2 Programming Why programming? Who program the program?
For solving problem. Who program the program? The programmer is programming a program!

3 The Programmer Convert problem solutions into instruction for the computer. Coordination meetings with users, managers, system analysts, and with peers who evaluate your work.

4 The Programming Process
defining the problem planning the solution coding the program testing the program, documenting the program.

5 Preparing a program for execution

6 The C Language 　綠園

7 History of C 西 元 1960 年 Algo 60 語 言 ( International Committe )
西 元 1963 年 CPL 語 言 ( 劍 橋 與 倫 敦 大 學 ) 西 元 1966 年 BCPL 語 言 下 ( 劍橋大學 Martin Richards ) 西 元 1970 年 B 語 言 ( AT&T Ken Thompson ) 西 元 1972 年 C 語 言 ( AT&T Dennis Ritchie )

8

9 Program I : Hello, I am … #include <stdio.h>
#include <stdlib.h> int main( ) { printf("Hello, I am Jenny!\n"); printf("This is output from my first program!\n"); system("PAUSE"); return 0; }

10 Program II : 5 + 7 = ? 執行結果 #include <stdio.h>
#include <stdlib.h> int main() { int a, b, c; a = 5; b = 7; c = a + b; printf("%d + %d = %d\n", a, b, c); system("PAUSE"); return 0; } a b c 5 7 12 5+7

11 Program III : How old are you ?
#include <stdio.h> 執行結果 #include <stdlib.h> int main( ) { int myage; myage = 16; printf("I am %d years old. \n", myage); printf("Next year, I will be %d years old. \n", myage+1); system("PAUSE"); return 0; }

12 How printf( ) work? printf("Hello"); printf("Hello\n");
printf("%d", b); printf("The temperature is "); printf(" degrees\n"); printf("The temperature is %d degrees\n", b); printf("%d + %d = %d\n", a, b, c);

13 資料型態 (character, 字元) char (integer, 整數) int (long integer, 長整數) long
(short integer, 短整數) short (浮點數) float (倍精度浮點數) double 佔1 byte 佔4 bytes 佔2 bytes 佔8 bytes

14 How printf( ) work? int (整數) uses %d float (浮點數) uses %f
char (字元) uses %c character strings(字串)use %s

15 變數 變數名稱要有意義，以增加程式的可讀性。（如num表數字、stud表學生人數） 變數名稱的限制： 不能使用Ｃ語言的關鍵字。
變數名稱的有效長度是前八位元。 可以是英文字母、數字或底線。 不能有空白字元。 第一個字元不能是數字。

16 計算BMI (一) 執行結果 已知：身高 height = 168; 體重 weight = 55; 求：BMI 運算式：
BMI = weight / (height)2 （身高單位為公尺、體重單位為公斤。） BMI = weight/(height*height/10000); 輸出：你的 BMI 值為xx.xx (%.2f) 執行結果

17 Program IV : a + b = ? 執行結果 #include <stdio.h>
#include <stdlib.h> int main() { int a, b, c; printf("Enter the first value:"); scanf("%d", &a); printf("Enter the second value:"); scanf("%d", &b); c = a + b; printf("%d + %d = %d\n", a, b, c); system("PAUSE"); return 0; }

18 Program V : How old are you ?
#include <stdio.h> 執行結果 #include <stdlib.h> int main() { int yourage; printf("How old are you?"); scanf("%d", &yourage); printf("Next Year, you will be %d years old.\n", yourage+1); system("PAUSE"); return 0; }

19 How scanf() work? scanf("%d", &b); scanf("%d %d", &a, &b);
int uses %d float uses %f char uses %c character strings use %s scanf("%d %d", &a, &b); scanf("%d,%d", &a, &b); 範例程式、執行結果

20 計算BMI (二) 輸入：身高(height), 體重(weight) 運算式： 輸出：你的BMI值為xx.xx
BMI = weight / (height)2 BMI = weight / (height * height) 　（身高單位為公尺、體重單位為公斤。） 輸出：你的BMI值為xx.xx 執行結果