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あらゆる型の配列をシャッフルする関数
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#include <stdio.h> | |
#include <stdlib.h> | |
#include <time.h> | |
// 配列シャッフル | |
void shuffle(void*, size_t, size_t); | |
// funcs | |
char _a(void) {return 'A';} | |
char _b(void) {return 'B';} | |
char _c(void) {return 'C';} | |
char _d(void) {return 'D';} | |
char _e(void) {return 'E';} | |
char _f(void) {return 'F';} | |
char _g(void) {return 'G';} | |
char _h(void) {return 'H';} | |
char _i(void) {return 'I';} | |
char _j(void) {return 'J';} | |
int main(void) | |
{ | |
int i; | |
int nums[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; | |
char strs[][7] = {"apple", "banana", "citron", "grape", "lemon", "mango", "melon", "orange", "peach", "pear"}; | |
char (*funcs[])(void) = {_a, _b, _c, _d, _e, _f, _g, _h, _i, _j}; | |
// 乱数シード設定 | |
srand((unsigned)time(NULL)); | |
// int 型配列 | |
shuffle(nums, sizeof(nums) / sizeof(*nums), sizeof(*nums)); | |
for (i = 0; i < sizeof(nums) / sizeof(*nums); i++) | |
printf("%d\n", nums[i]); | |
// char 型 2 次元配列 | |
shuffle(strs, sizeof(strs) / sizeof(*strs), sizeof(*strs)); | |
for (i = 0; i < sizeof(strs) / sizeof(*strs); i++) | |
printf("%s\n", strs[i]); | |
// 関数ポインタ配列 | |
shuffle(funcs, sizeof(funcs) / sizeof(*funcs), sizeof(*funcs)); | |
for (i = 0; i < sizeof(funcs) / sizeof(*funcs); i++) | |
putchar(funcs[i]()); | |
puts(""); | |
return 0; | |
} | |
// 配列シャッフル | |
void shuffle(void *arr, size_t arr_len, size_t elem_size) | |
{ | |
char *a = (char *)arr, *b; | |
size_t i, j; | |
for (i = 0; i < arr_len; i++) { | |
// ランダムに要素を決定 | |
b = (char *)arr + (rand() % arr_len) * elem_size; | |
// 入れ替え判定 | |
if (a != b) { | |
// 1 byte ずつ入れ替え | |
for (j = 0; j < elem_size; j++) { | |
*a ^= *b; | |
*b ^= *a; | |
*(a++) ^= *(b++); | |
} | |
} else { | |
a += elem_size; | |
} | |
} | |
} |
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