int strlen(char *s)
{
    int i=0;
    while(*s!='\0')
    {
        i++;
        s++;
    }
    return i;
}

void main()
{
    char str[100];
    int len;
    printf("please input your string:");
    gets(str);
    len=strlen(str);
    printf("the length of str is:%d\n",len);
}

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