開発環境
- OS X Lion - Apple(OS)
- TextWrangler(Text Editor) (BBEditの無料、light版)
- 言語: C
- コンパイラ: UNIX ccコンパイラ (汎用UNIX)
『実践プログラミング 第3版』 (Steve Oualline (著)、 望月 康司 (監修) (翻訳)、 谷口 功 (翻訳)、 オライリー・ジャパン、1998年、ISBN978-4900900646) II部(単純なプログラミング)の11章(ビット演算)11.10(プログラミング実習)実習11-1を解いてみる。
実習11-1.
コード(TextWrangler)
#include <stdio.h>
#define X_SIZE 40
#define Y_SIZE 60
char graphics[X_SIZE / 8][Y_SIZE];
#define SET_BIT(x,y) graphics[(x)/8][y] |= (0x80 >> ((x)%8))
#define CLEAR_BIT(x,y) graphics[(x)/8][y] ^= (0x80 >> ((x)%8))
#define TEST_BIT(x,y) (graphics[(x)/8][y] == (0x80 >> ((x)%8)))
int main(){
int loc;
void print_graphics(void);
for (loc = 0; loc < X_SIZE; ++loc){
SET_BIT(loc,loc);
}
print_graphics();
printf("6行目\n");
for(loc = 0 ; loc < X_SIZE; ++loc){
if(TEST_BIT(loc,5)){
printf("True\n");
} else {
printf("False\n");
}
}
printf("\n");
for(loc = 0; loc < X_SIZE; ++loc){
CLEAR_BIT(loc,loc);
}
print_graphics();
printf("6行目\n");
for(loc = 0 ; loc < X_SIZE; ++loc){
if(TEST_BIT(loc,5)){
printf("True\n");
} else {
printf("False\n");
}
}
return (0);
}
void print_graphics(void){
int x;
int y;
unsigned int bit;
for(y=0;y<Y_SIZE; ++y){
for(x = 0; x<X_SIZE/8; ++x){
for(bit = 0x80;bit > 0; bit = (bit >>1)){
if((graphics[x][y] & bit) != 0){
printf("X");
} else {
printf(".");
}
}
}
printf("\n");
}
}
入出力結果(Terminal)
$ ./sample X....................................... .X...................................... ..X..................................... ...X.................................... ....X................................... .....X.................................. ......X................................. .......X................................ ........X............................... .........X.............................. ..........X............................. ...........X............................ ............X........................... .............X.......................... ..............X......................... ...............X........................ ................X....................... .................X...................... ..................X..................... ...................X.................... ....................X................... .....................X.................. ......................X................. .......................X................ ........................X............... .........................X.............. ..........................X............. ...........................X............ ............................X........... .............................X.......... ..............................X......... ...............................X........ ................................X....... .................................X...... ..................................X..... ...................................X.... ....................................X... .....................................X.. ......................................X. .......................................X ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ 6行目 False False False False False True False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ 6行目 False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False False $
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