字符串下标超出范围 [英] String subscript out of Range

问题描述

嘿，



我想知道如何摆脱字符串下标超出范围的错误？

或者如何初始化字符串以消除此错误？

  bool  Find_Student （管理员和学生）
 {
  string  sline，stemp; 
  int  counter =  1 ; 
  bool  isFound =  false ; 
  int  iStudent_num =  0 ; 
 stemp = student.return_roll（）;  //  从类中获取卷号，工作正常 
  int  sSize = stemp.length（）; 
 ifstream myfile（  student.txt）; 
  while （！myfile.eof（））
 {
 counter =  1 < /跨度>; 
 getline（myfile，sline）; 
 iStudent_num ++; 
  while （stemp [counter] == sline [counter]） //  在调试时给出错误 
 {
 counter ++; 
  if （counter ==  7 ）
 {
 isFound =  true ; 
  break ; 
} 
} 
  ///   ///留下剩下的东西/ //// 
   if （isFound ==  true ）
 {
 student = fetch_data（sline）; 
  break ; 
} 
} 
 
 myfile.close（）; 
  return  isFound; 
} 

/////////student.txt///////

 l114443 $ Talha Jamil $ samsung $ 12 $ 17 $ 2004 $ UnderGraduate $！ 
 l114445 $ Kamran Javed $ jannat123 $ 12 $ 12 $ 2009 $ UnderGraduate $！ 
 l114093 $ Imran Khan $ pluto123 $ 11 $ 4 $ 2009 $ UnderGraduate $！ 
 l114444 $ Jamil Ahmed $ origin123 $ 11 $ 12 $ 2009 $ UnderGraduate $！ 
 l114606 $ Zain Malik $ samsung $ 9 $ 16 $ 2009 $毕业生$！ 
 l114441 $ Saad Kamran $ samsung $ 11 $ 4 $ 2004 $毕业生$！

假设输入在Roll_num中给出的是l114441

解决方案

Talha Jamil

samsung

12

Hey,

I want to know how can i rid of "string subscript out of range" error?
Or how to initialize the string to get rid of this error?

bool Find_Student(Administrator &student)
{
    string sline,stemp;
    int counter=1;
    bool isFound=false;
    int iStudent_num=0;
    stemp=student.return_roll();   //gets roll number from class, works fine
    int sSize=stemp.length();
    ifstream myfile("student.txt");
    while(!myfile.eof())
    {
        counter=1;
        getline(myfile,sline);
        iStudent_num++;
        while(stemp[counter]==sline[counter])    //give error here while debugging
        {
            counter++;
            if(counter==7)
            {
                isFound=true;
                break;
            }
        }
   //////Leave the rest of stuff/////
        if(isFound==true)
        {
                student=fetch_data(sline);
                break;
        }
    }

    myfile.close();
    return isFound;
}

/////////student.txt///////

l114443$Talha Jamil$samsung$12$17$2004$UnderGraduate$!
l114445$Kamran Javed$jannat123$12$12$2009$UnderGraduate$!
l114093$Imran Khan$pluto123$11$4$2009$UnderGraduate$!
l114444$Jamil Ahmed$origin123$11$12$2009$UnderGraduate$!
l114606$Zain Malik$samsung$9$16$2009$Graduate$!
l114441$Saad Kamran$samsung$11$4$2004$Graduate$!

Suppose Input given in Roll_num is l114441

解决方案

Talha Jamil

samsung

12

这篇关于字符串下标超出范围的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！