debug assertion failed

Question

Expression:Vector subscript out of range.

//Program code:

#include<iostream>
#include<vector>
using namespace std;

int main()
{
 char alp;
 vector<int> num(26,0);
 while(cin.get(alp))
 {
  switch(alp)
  {
   case 'A':                    //counting characters
   case 'a':num[0]++;    break;
   case 'B':
   case 'b':num[1]++;    break;
   case 'C':
   case 'c':num[2]++;    break;
   case 'D':
   case 'd':num[3]++;    break;
   case 'E':
   case 'e':num[4]++;    break;
   case 'F':
   case 'f':num[5]++;    break;
   case 'G':
   case 'g':num[6]++;    break;
   case 'H':
   case 'h':num[7]++;    break;
   case 'I':
   case 'i':num[8]++;    break;
   case 'J':
   case 'j':num[9]++;    break;
   case 'K':
   case 'k':num[10]++;   break;
   case 'L':
   case 'l':num[11]++;   break;
   case 'M':
   case 'm':num[12]++;   break;
   case 'N':
   case 'n':num[13]++;   break;
   case 'O':
   case 'o':num[14]++;   break;
   case 'P':
   case 'p':num[15]++;   break;
   case 'Q':
   case 'q':num[16]++;   break;
   case 'R':
   case 'r':num[17]++;   break;
   case 'S':
   case 's':num[18]++;   break;
   case 'T':
   case 't':num[19]++;   break;
   case 'U':
   case 'u':num[20]++;   break;
   case 'V':
   case 'v':num[21]++;   break;
   case 'W':
   case 'w':num[22]++;   break;
   case 'X':
   case 'x':num[23]++;   break;
   case 'Y':
   case 'y':num[24]++;   break;
   case 'Z':
   case 'z':num[25]++;   break;
   case ' ':num[26]++;   break;//couting space characters
   case '\t':num[27]++;  break;//counting tab characters
   case '\n':num[28]++;  break;//counting newline characters
   default:cout<<"error!"<<endl;
                      break;//insuring switch being broken
  }
 }
 for(vector<int>::size_type i=0;i!=29;i++)//outputing statistics results
  cout<<num[i]<<endl;
 return 0;
}

//what's the matter? And how to solve the problem?

//using vs2005

Answer 1

vector<int> num(26,0);
or
vector<int> num(29,0);  ???

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Visual C++ enthusiast, like network programming and driver development. At present is being engaged in the WinCE/Windows Mobile platform embedded development.

Answer 2

Thank you for your help and you patience!

Actually it's a low-level error. and then i want to ask you that how to terminate the while loop.

Answer 3

You can define a terminator and add it in the while expression

 while(cin.get(alp)&& alp !='whatever'

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麻烦把正确答案设为解答。

Answer 4

I see! Thank you!