// Example 3-4：求字符串的長度
#include <iostream.h>
int mystrlen(char string[])
{
	int len = 0;
	while(string[len]!='\0')
		len = len+1;
	return len;
}
void main()
{
	char sentence[] = "This is a sample.";
	
	cout<<"The length of sentence: "<<sentence<<" is "<<mystrlen(sentence)<<endl;
}