C语言调试代码

#include 
#include
#include
char* my_cp(char* dest,const char* ret);
int my_len(const char* str);
int main()
{
	int i = 0;
	int sum = 0;
	int ret = 1;
	int n = 0;
	scanf_s("%d", &n);
	for (i = 1; i <= n; i++) {
		int j = 0;
		int ret = 1;
		for (j=1;j<=i;j++)
		{
			 
			ret *= j;
		}
		sum += ret;
	}
	char arr1[] = "sssssss";
	char arr2[] = "sa";
	my_cp(arr1, arr2);
	printf("%dn", sum);
	printf("%sn", arr1);
	int lens = my_len(arr2);
	printf("%d", lens);
	return 0;

} 
char* my_cp(char *dest,const char * ret)
{
	char* d = dest;
	assert(dest!=NULL);
	assert(ret != NULL);
	while (*dest++=*ret++) {
		;
	}
	return d;
}
int my_len(const char* str)
{
	int count = 0;
	assert(str != 0);
	while (*str!='')
	{
		str++;
		count++;
	}
	return count;
}
//F9 F5 F11 F10 shift F11