定义指针函数，输入字符串求其中的字母、数字和其它字符的个数

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#include "stdio.h"
#define M 1000  // 宏定义字节最大长度
int character = 0, num = 0, other = 0;

int f(char *x)
{
int i = 0;


for ( i = 0; *(x+i) != ''; i++)
{
if (( *( x + i ) >= 'a' && *( x + i) <= 'z') || (*( x + i ) >= 'A' && *( x + i) <= 'Z'))//字母个数
character++;
else if ( *( x + i ) >= '0' && *( x + i) <= '9')//数字个数
num++;
else
other++;//其它字符个数
}

printf ("The character is:%d
", character );
printf ("The number is:%d
", num );
printf ("Other is:%d
", other );

return ( word, num, other);
}
 main()
{

 char ch[M];

printf ("请输入你要求的字符串
");
gets(ch);//字符串的输入

f(ch);//函数的调用

}