程序6.1字符串长度

#include
unsigned int strlen(char *src)
{
        unsigned int len=0;
        while(*src !='\0')
                len ;
        return len;
}
int main()
{
        char *a="abcdef";
        unsigned int len=0;
        len=strlen(a);
        printf("the string a are \"%s\"\n",a);
        printf("the length of a is %d\n",len);
}