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int main(){
printf("Hello world!/n"); printf 是一個涵式 能將括號內的字串印出
return 0; 字串以雙引號表示
} return的用途是回傳一個結果 return 0 表示回傳
0表示程式成功執行完畢
printf 是另外一個事先寫好的涵式. 所以在程式碼第一行 要加上 #include <stdio.h> #include <stdio.h>
將stdio.h 這個檔案的內容加進來 此檔案為C語言內建的檔案, include的指令會把此檔案內容加入程式碼
這樣就能使用printf這個涵式
此為內建函式的呼叫 (built-in function)
C語言的語法中 字串的雙引號之間是不能用enter換行切開, 所以必須要使用n來表示一個換行字元
n 是一個跳脫序列(escape sequence) 通常跳出序列都是反斜線 開頭
常見的(escape sequence) 反斜線 可以讓你程式延伸到下一行
n 換行 " 雙引號 \ 反斜線 ' 單引號 t 跳位(空行)
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