2．分别统计一维字符数组char a[12];中字母的个数，数字字符的个数和其它字符的个数。( 9分）

#include<iostream.h>
void main()
{
char ch[12];
int i,number(0),letter(0),other(0);
cout<<"请输入字符:";
for(i=0;i<=11;i++)
cin>>ch[i];
for(i=0;i<12;i++)
{

if ((ch[i]>='A'&&ch[i]<='Z')||(ch[i]>='a'&&ch[i]<='z'))
letter++;
else if (ch[i]>='0'&&ch[i] <='9')
number++;
else other++;
}

cout<<"number:"<<number<<",letter"<<letter<<",other"<<other<<endl;
}

letter=0;
dig=0;
oth=0
for (i=0; i<12; i++)
if ((a[i]>='A' 并且 <='Z')或者(a[i]>='a'并且<='z'))
letter++;
else if (a[i]>='0' 并且 <='9')
dig++;
else
oth++;