数字符数组的字符数

#include <stdio.h>

strlen(char*s)

{                 

    char*p=s;

    while(*p)

        p++;

    returnp-s;

}                 

main()

{                 

    chara[50];

    printf("Enter string:");

    scanf("%s",a);

    printf("string length=%d\n",strlen(a));

}