Question

I am trying to do this assignment:

Write a program that reads a list of concepts/strings from the LIST.txt text file (one concept per line), stores them into an array of strings, and then prints the following:

1.Prints a heading “LIST1:” and then prints all the concepts from the array, one concept per line

2.Prints a heading “LIST2:” and then prints all the concepts from the array that do not contain spaces, one concept per line

3.Prints a heading “LIST3:” and then prints all the concepts from the array that ends with the letter “A”, one concept per line

4.Prints a heading “LIST4:” and then prints all the concepts from the array that contain “of” (in any cases), one concept per line

5.Prints a heading “LIST5:” and then prints all the concepts from the array that contains more than one spaces, one concept per line

6.Prints a heading “LIST6:” and then prints all the concepts from the array that start with a consonant, one concept per line

7.Prints a heading “LIST7:”, sorts the array using the selection sort method from the textbook or practice exercises1and prints all the concepts from the array in alphabetical order, one concept per line

The list is:

UNITED STATES OF AMERICA

Alabama

Alaska

Arizona

Arkansas

California

Colorado

Connecticut

Delaware

District Of Columbia

Florida

Georgia

Hawaii

Idaho

Illinois

Indiana

Iowa

Kansas

Kentucky

Louisiana

Maine

Maryland

Massachusetts

Michigan

Minnesota

Mississippi

Missouri

Montana

Nebraska

Nevada

New Hampshire

New Jersey

New Mexico

New York

North Carolina

North Dakota

Ohio

Oklahoma

Oregon

Pennsylvania

Rhode Island

South Carolina

South Dakota

Tennessee

Texas

Utah

Vermont

Virginia

Washington

West Virginia

Wisconsin

Wyoming

American Samoa

District of Columbia

Guam

Northern Mariana Islands

Puerto Rico

United States Virgin Islands

The problem I am having is for list 3. When trying to test the program I get the debugging error "expression: string subscript out of range"

This is my code

#include
#include
#include
using namespace std;

int main()
{
ifstream file("LIST.txt");
int i = 0;
string listArray[500];
char str[255];

if (file.is_open())
{

while (file)
{
file.getline(str, 300);
listArray[i] = str;
i++;
}
cout << endl << "List 1 " << endl << endl;
for (int j = 0; j < i; j++)
cout << listArray[j] << "\n";
}

cout << endl << "List 2" << endl << endl;
for (int j = 0; j < i; j++)
{
if (listArray[j].find(' ') == string::npos)
cout << listArray[j] << endl;
}

cout << "List 3" << endl << endl;
for (int j = 0; j < i; j++) -This is the section I get an error
{
int n = listArray[j].size() -1;
if (listArray[j][i] == 'a' || listArray[j][i] == 'A')
cout << listArray[j] << endl;
  
}

}

What can I do to fix it?

Answer 1

I have made the change and formatted it in bold.

C++ Code:

#include<iostream>
#include<fstream>
#include<string>
using namespace std;

int main()
{
ifstream file("LIST.txt");
int i = 0;
string listArray[500];
char str[255];

if (file.is_open())
{

while (file)
{
file.getline(str, 300);
listArray[i] = str;
i++;
}
cout << endl << "List 1 " << endl << endl;
for (int j = 0; j < i; j++)
cout << listArray[j] << "\n";
}

cout << endl << "List 2" << endl << endl;
for (int j = 0; j < i; j++)
{
if (listArray[j].find(' ') == string::npos)
cout << listArray[j] << endl;
}

cout << "List 3" << endl << endl;
for (int j = 0; j < i; j++) //This is the section I get an error
{
int n = listArray[j].size() -1; //getting the size of the string
if (listArray[j][n] == 'a' || listArray[j][n] == 'A') //changed the index from 'i' to 'n' which is the index of last element of the string in the list
cout << listArray[j] << endl;

}

}

Sample Ooutput:

List 1

UNITED STATES OF AMERICA
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
District Of Columbia
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
West Virginia
Wisconsin
Wyoming
American Samoa
District of Columbia
Guam
Northern Mariana Islands
Puerto Rico
United States Virgin Islands

List 2

Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
Ohio
Oklahoma
Oregon
Pennsylvania
Tennessee
Texas
Utah
Vermont
Virginia
Washington
Wisconsin
Wyoming
Guam

List 3

UNITED STATES OF AMERICA
Alabama
Alaska
Arizona
California
District Of Columbia
Florida
Georgia
Indiana
Iowa
Louisiana
Minnesota
Montana
Nebraska
Nevada
North Carolina
North Dakota
Oklahoma
Pennsylvania
South Carolina
South Dakota
Virginia
West Virginia
American Samoa
District of Columbia