C语言字符函数

#include
#include
#include
#include
#include
#include
#define _CRT_SECURE_NO_WARNINGS 1
void* my_memcopy(void* dest,void* str, size_t num);
int main()
{
char arr[] = "I AM SS";
int i = 0;
while (arr[i])
{
if (isupper(arr[i]))
{
arr[i]= tolower(arr[i]);

}
i++;
}
printf("%s", arr);
return 0;
/*char arr[] = "[email protected]";
const char* p = "@.";
char* ret = NULL;
for ( ret = strtok(arr,p); ret !=N

C语言字符函数最先出现在Python成神之路。