字符串函数和布局题内存对齐
https://i-blog.csdnimg.cn/direct/61bd54c604ee423c8bea35e94298f8f0.png图下为函数使用:
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#include <ctype.h>
int main()
{
int ret = isdigit('Q');
printf("%d\n", ret);
return 0;
}
int main()
{
printf("%c\n", toupper('a'));
printf("%c\n", tolower('A'));
return 0;
} https://i-blog.csdnimg.cn/direct/6eb9fcc216d741e68c4d128aff6eb0bf.png
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