C语言：计数器实现求字符串长度。

#include<stdio.h>
#include<assert.h>
int mystrlen(char* str)
{
    
    
	int count = 0;
	assert(str != NULL);
	while (*str!='\0')
	{
    
    
		count++;
		str++;
	}
	return count;
}
int main()
{
    
    
	char arr[] = "adsfsd";
	int len = mystrlen(arr);
	printf("%d\n", len);
	return 0;
}