下列 C 程式執行後的結果為何？ char s1[10]="abc",s2[10]="abc",s3[10]="def"; if (s1==s2) printf("string1 and string2 are the same\n"); else printf("string1 and string2 are different\n"); if (s1==s3) printf("string1 and string3 are the same"); else printf("string1 and string3 are different");