Tedd OKANO
just a sample of what can be done
PRN電卓プログラム
「プログラミング言語C (K&R本)」に出てくる例を元にした，RPN計算機です．
写真はイメージです
このプログラムは..
- 『mbed祭り 2015@初夏の東銀座』の親睦会で「RPN」と題して行ったLT(LightningTalk)でのデモ・プログラムです．
- mbed LPC1768，mbed LPC1114FN28で実行できることを確認しています(たぶん他のプラットフォームでも動きます)
- プレゼンスライドを置いておきます
getop.cpp@5:3b9daee5f734, 2015-06-27 (annotated)
- Committer:
- okano
- Date:
- Sat Jun 27 01:29:21 2015 +0000
- Revision:
- 5:3b9daee5f734
- Parent:
- 3:4ef74510cc5b
functions "power" and "drop" are added
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| okano | 2:0e96f4495b43 | 1 | #include "mbed.h" |
| okano | 2:0e96f4495b43 | 2 | #include "calc.h" |
| okano | 2:0e96f4495b43 | 3 | #include <ctype.h> |
| okano | 2:0e96f4495b43 | 4 | |
| okano | 2:0e96f4495b43 | 5 | int getop( char s[] ) |
| okano | 2:0e96f4495b43 | 6 | { |
| okano | 2:0e96f4495b43 | 7 | int i, c; |
| okano | 2:0e96f4495b43 | 8 | |
| okano | 2:0e96f4495b43 | 9 | while ( (s[ 0 ] = c = getch()) == ' ' || c == '\t' ) |
| okano | 2:0e96f4495b43 | 10 | ; |
| okano | 2:0e96f4495b43 | 11 | |
| okano | 2:0e96f4495b43 | 12 | s[ 1 ] = '\0'; |
| okano | 2:0e96f4495b43 | 13 | |
| okano | 2:0e96f4495b43 | 14 | if ( !isdigit( c ) && c != '.' ) |
| okano | 2:0e96f4495b43 | 15 | return c; |
| okano | 2:0e96f4495b43 | 16 | |
| okano | 2:0e96f4495b43 | 17 | i = 0; |
| okano | 2:0e96f4495b43 | 18 | |
| okano | 2:0e96f4495b43 | 19 | if ( isdigit( c ) ) |
| okano | 2:0e96f4495b43 | 20 | while ( isdigit( s[ ++i ] = c = getch() ) ) |
| okano | 2:0e96f4495b43 | 21 | ; |
| okano | 2:0e96f4495b43 | 22 | |
| okano | 2:0e96f4495b43 | 23 | if ( c == '.' ) |
| okano | 2:0e96f4495b43 | 24 | while ( isdigit( s[ ++i ] = c = getch() ) ) |
| okano | 2:0e96f4495b43 | 25 | ; |
| okano | 2:0e96f4495b43 | 26 | |
| okano | 2:0e96f4495b43 | 27 | s[ i ] = '\0'; |
| okano | 2:0e96f4495b43 | 28 | |
| okano | 2:0e96f4495b43 | 29 | |
| okano | 2:0e96f4495b43 | 30 | if ( c != EOF ) |
| okano | 2:0e96f4495b43 | 31 | ungetch( c ); |
| okano | 2:0e96f4495b43 | 32 | |
| okano | 2:0e96f4495b43 | 33 | return NUMBER; |
| okano | 2:0e96f4495b43 | 34 | } |