这样都错了，求解答
#include<iostream>
using namespace std;
int main()
{
const int N=80;
char buffer[N];
int k=0;
const int NUM=26;
int counts[NUM]={0};
char letters{NUM};
int i=0;
do
{
cout<<"Enter a string:"<<endl;
cin.getline(buffer,N,'\n');
k=0;
while(buffer[k]!='\n')
{
i=tolower(buffer[k]-'a');
counts[i]++;
k++;
}
}while(buffer[0]!='\n');
cout<<"The statistic result is:"<<endl;
for(i=0;i<NUM;i++)
{
letters[i]=(char)('a'+i); //1)
if(counts[i]>0)
{
cout<<letters[i]<<":"<<counts[i]<<endl; //2)

}
}
return 0;
}


显示的error：
1）invalid types 'char[int]' for arry subcript
2) invalid types for arry subcript


[解决办法]
char letters{NUM}; char letters[NUM];
[解决办法]

C/C++ code

  const int NUM=26;  int counts[NUM]={0};  char letters{NUM};//楼主你这儿错了，应该是[]
[解决办法]
数组越界 比如counts[i]++; 这个i可能大于26 也可能小于0
[解决办法]
修改后的：
#include<iostream>
using namespace std;
int main()
{
const int N=80;
char buffer[N];
int k=0;
const int NUM=26;
int counts[NUM]={0};
char letters[NUM] = {0};
int i=0;
do
{
cout<<"Enter a string:"<<endl;
cin.getline(buffer, N, '\n');
k=0;

while(buffer[k] != 0)
{
i = tolower(buffer[k])-'a';
counts[i] += 1;
k++;
}
}while(buffer[0]!=0);
cout<<"The statistic result is:"<<endl;
for(i=0;i<NUM;i++)
{
letters[i]=(char)('a'+i); //1)
if(counts[i]>0)
{
cout<<letters[i]<<":"<<counts[i]<<endl; //2)

}
}
return 0;
}
[解决办法]
C/C++ code
while(buffer[k]!='\n')        {            i=tolower(buffer[k]-'a');            counts[i]++;            k++;        }
[解决办法]
#include<iostream>
using namespace std;
int main()
{
 const int N=80;
 char buffer[N];
 int k=0;
 const int NUM=26;
 int counts[NUM]={0};
 char letters[NUM];
 int i=0;
 do
 {
 cout<<"Enter a string:"<<endl;
 cin.getline(buffer,N,'\n');
 k=0;
 while(buffer[k]!='\n')
 {
 i=tolower(buffer[k]-'a');
 counts[i]++;
 k++;
 }
 }while(buffer[0]!='\n');
 cout<<"The statistic result is:"<<endl;
 for(i=0;i<NUM;i++)
 {
 letters[i]=(char)('a'+i); //1)
 if(counts[i]>0)
 {
 cout<<letters[i]<<":"<<counts[i]<<endl; //2)

 }
 }
 return 0;
}