编的一个C程序，但是在Dev-C++中提示有错误编译不通过，请各位高手帮我看看

#include<stdio.h>

main()

{int upper=0,lower=0,digit=0,space=0,other=0,i=0;

char*p,s[20];

printf("input string:   ");

while((s[i]=getchar())!='\n')i++;

p=&s[0];

while(*p!='\n');

{if(('A'<=*p)&&(*p<='Z'))

   ++upper;

else if(('a'<=*p)&&(*p<='z'))

   ++lower;

else if(*p=='')

   ++space;

else if((*p<='9')&&(*p>='0'))

   ++digit;

else

   ++other;

   p++;

}

printf("upper case:%d      lower case:%d",upper,lower);

printf("     space:%d      digit:%d    other:%d\n",space,digit,other);

while(1);}

#include<stdio.h>

void main()

{int upper=0,lower=0,digit=0,space=0,other=0,i=0;

char *p,s[20];

printf("input string:   ");

while((s[i]=getchar())!='\n')i++;

p=&s[0];

while(*p!='\n')

{if(('A'<=*p)&&(*p<='Z'))

   ++upper;

else if(('a'<=*p)&&(*p<='z'))

   ++lower;

else if(*p==' ')

   ++space;

else if((*p<='9')&&(*p>='0'))

   ++digit;

else

   ++other;

   p++;

}

printf("upper case:%d    lower case:%d",upper,lower);

printf("    space:%d    digit:%d    other:%d\n",space,digit,other);

}
//可以了