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Brainf**k !!
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#include<stdio.h> | |
#include<string.h> | |
#define MAX_MEM_SIZE 30000 | |
int evalInstruction(char*, int, char**); | |
char* strrnchr(char*, int, char); | |
int main(void) { | |
/* Hello World ! */ | |
char instructions[] = "++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>."; | |
/* char instructions[] = "++[>+[>++[>]]]"; */ | |
int i, instructions_size = strlen(instructions); | |
char mem[MAX_MEM_SIZE] = {0}, *dataPtr = mem; | |
evalInstruction(instructions, instructions_size, &dataPtr); | |
return 0; | |
} | |
/* 指定したサイズ直前の指定文字を見つける */ | |
char* strrnchr(char* str, int size, char ch){ | |
int i; | |
char* detectPos = NULL; | |
for (i = 0; i < size; ++i) { | |
if (str[i] == ch) { | |
detectPos = str + i; | |
} | |
} | |
return detectPos; | |
} | |
int evalInstruction(char* instructions, int instructions_size, char** dataPtr){ | |
int i, betweenParenSize = 0; | |
for (i = 0; i < instructions_size; ++i) { | |
switch (instructions[i]) { | |
case '>': | |
++(*dataPtr); | |
break; | |
case '<': | |
--(*dataPtr); | |
break; | |
case '+': | |
++(**dataPtr); | |
break; | |
case '-': | |
--(**dataPtr); | |
break; | |
case '.': | |
putchar(**dataPtr); | |
break; | |
case ',': | |
**dataPtr = getchar(); | |
break; | |
case '[': | |
// 対になる']'までのサイズ | |
betweenParenSize = strrnchr(instructions, instructions_size, ']') - (instructions + i); | |
// 0でないのでループ | |
if (**dataPtr != 0) { | |
/* '[]'の内部を抜き出して再帰評価させる */ | |
while (0 != evalInstruction(instructions + i + 1, betweenParenSize - 1, dataPtr)){} | |
} | |
// '[]'内の処理をしたのでずらす | |
i += betweenParenSize; | |
break; | |
} | |
} | |
// ']' の判別用 | |
return **dataPtr; | |
} |
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