c++ - strcmp

Question

char a[2] = { '1','2' };
printf("%d", strcmp(a, "12"));

结果为 1

一个没有结束符，一个有结束符，为什么没有的比有的大？

Answer 1

Char is generally regarded as an unsigned integer, a[2] is a random value, and there are only two situations: greater than 0 and equal to 0.

Most of the time, a[2] is greater than '

Answer 2

Similar to the previous question - that question, my answer was trampled by the crowd - strings are strings, and character arrays are character arrays. The strcmp function requires you to pass in a string, because only strings have

char a[] = {'1', '2', 'rrreee'};
printf("%d", strcmp(a, "12"));

The result you get is not actually 1, but a random value. Because the strcmp function does not know the length of

, it performs an out-of-bounds access to memory. a