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#include <stdio.h> #include <stdlib.h> int ishex (char c) { int i = 0; char *list = "0123456789AaBbCcDdEeFf"; while (list[i]!='\0') { if (c==list[i++]) return 1; } return 0; } int main (void) { char str[256], tmp[2] = {0}; int i = 0, d; printf("16進数を入力してください\n>"); fgets(str, 256, stdin); while (1) { tmp[0] = str[i++]; if (!ishex(tmp[0])) break; d = strtol(tmp, NULL, 16); fputc((d&8)?'1':'0', stdout); fputc((d&4)?'1':'0', stdout); fputc((d&2)?'1':'0', stdout); fputc((d&1)?'1':'0', stdout); fputc(' ', stdout); } return 0; }
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