Programming Language Telling the computer what to do

Programming n Why programming? n n For solving problem. Who program the program? n

The Programmer Convert problem solutions into instruction for the computer. n Coordination meetings with

The Programming Process n n n defining the problem planning the solution coding the

History of C n n n 西元 1960 年 Committe ) 西元

Program I : Hello, I am … #include <stdio. h> #include <stdlib. h> int

Program II : 5 + 7 = ? 執行結果 #include <stdio. h> #include <stdlib.

Program III : How old are you ? #include <stdio. h> #include <stdlib. h>

How printf( ) work? n n n printf("Hello"); printf("Hellon"); printf("%d", b); printf("The temperature is

資料型態 (character, 字元) char (integer, 整數) int (long integer, 長整數) long (short integer, 短整數)

How printf( ) work? n n int (整數) uses %d float (浮點數) uses %f

Program IV : a + b = ? 執行結果 #include <stdio. h> #include <stdlib.

Program V : How old are you ? #include <stdio. h> 執行結果 #include <stdlib.

How scanf() work? n scanf("%d", &b); n n n n int uses %d float

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Programming & Language Telling the computer what to do 2005. 04 綠園

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

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

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

Preparing a program for execution

The C Language 2004. 09 綠園

History of C n n n 西元 1960 年 Committe ) 西元 1963 年 ) 西元 1966 年 Richards ) 西元 1970 年西元 1972 年 Algo 60 語言 ( International CPL 語言 ( 劍橋與倫敦大學 BCPL 語言下 ( 劍橋大學 Martin B 語言 ( AT&T Ken Thompson ) C 語言 ( AT&T Dennis Ritchie )

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; }

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

Program III : How old are you ? #include <stdio. h> #include <stdlib. h> int main( ) { int myage; 執行結果 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; }

How printf( ) work? n n n printf("Hello"); printf("Hellon"); printf("%d", b); printf("The temperature is "); printf("%d", b); printf(" degreesn"); printf("The temperature is %d degreesn", b); printf("%d + %d = %dn", a, b, c);

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 4 bytes 佔 8 bytes

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

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 = %dn", a, b, c); system("PAUSE"); return 0; }

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; }

How scanf() work? n scanf("%d", &b); n n n n 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