#include <stdio.h> #include <string.h> struct struct_test { char str1[10]; char str2[20]; }; int main () { struct struct_test st1 = {"abcde", "123456"}; struct struct_test st2 = {"abcde", "123456"}; struct struct_test st3 = {"abcde", "123356"}; struct struct_test st4 = {"cccde", "fghijk"}; printf("比較 \"11\" \"22\" : %d\n", memcmp("11", "22", 2)); printf("比較 \"cc\" \"aa\" : %d\n", memcmp("cc", "aa", 2)); printf("比較 st1 st2 : %d\n", memcmp(&st1, &st2, (size_t)sizeof(st1))); printf("比較 st1 st3 : %d\n", memcmp(&st1, &st3, (size_t)sizeof(st1))); printf("比較 st1 st3 5バイト : %d\n", memcmp(&st1, &st3, 5)); printf("比較 st1 st4 : %d\n", memcmp(&st1, &st4, (size_t)sizeof(st1))); return 0; }