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)自習11-2を解いてみる。
実習11-2.
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);
int x, y;
char line[100];
for(x = 0; x < 10; ++x){
for(y = 0; y < 10; ++y){
SET_BIT(x, y);
}
}
print_graphics();
return (0);
}
void print_graphics(void){
int x, 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)
$ cc -g -o sample sample.c $ ./sample XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. XXXXXXXXXX.............................. ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ ........................................ $
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