Member Avatar for lotrsimp12345 
#include <iostream>
#include <cstdlib>

using namespace std;

int main()
{


    cout <<"enter the problemset and number""\n";
    //problems represents name and numbers
    string problems;
    string problem_name_and_numbers=problems;
    string numbers;
    char quote;
    int total_length=problems.length();
    //gather name
    if(cin.peek()=='"' || cin.peek() == '\'')
    {
        cin >>quote;
        getline(cin,problems,quote);
        int problemslength=(problems.length()+1);
        int difference=total_length-problemlength;
        numbers=problem_name_and_numbers.substr(problemlength,difference);
    }
    else
    {
        getline(cin,problems);
        int problemslength=(problems.length()+1);
        int difference=total_length-problemlength;
        numbers=problem_name_and_numbers.substr(problemlength,difference);
    }

    //gather problem numbers

    return 0;
}
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  • Latest Post Latest Post by lotrsimp12345

Dani AI

Generated

A quick note for future readers: the compile-time complaint in this thread was resolved by the original poster (), but the cause seen here is very common and worth documenting.

Common causes and a short checklist

  • Typos and inconsistent names are the number-one cause. C++ identifiers are case-sensitive and must match exactly where declared and used.
  • Scope matters: a name declared inside a pair of braces is not visible outside them. Declare values in the right block or move the declaration higher.
  • Make sure each variable is declared before it’s used. Built-in types left uninitialized cause UB; standard library types like std::string default to empty but still must be declared first.
  • Use the compiler’s error line numbers to find the spot, and enable warnings (for gcc/clang use -Wall -Wextra) to catch other problems early.
  • Include the correct headers when using library types or functions (for strings see the <string> header).

Minimal example of the right idea (different names than the original post):

#include <iostream>
#include <string>

int main() {
    std::string title;
    std::getline(std::cin, title);

    std::size_t title_len = title.length(); // declared and used consistently
    if (title_len > 0) {
        std::string tail = title.substr(1); // safe use after checks
    }
    std::cout << "length=" << title_len << '\n';
    return 0;
}

References and final tips: read about C++ scope rules and the string length/size member for exact behavior: scope rules, , and <string> header. Use an editor that highlights unknown symbols to catch misspellings quickly.

Member Avatar for lotrsimp12345

it doesn't like problems.length

Member Avatar for lotrsimp12345

problemlength wasn't declared in this scope

Member Avatar for csurfer

Are you asking a question or answering your own question ???

Member Avatar for lotrsimp12345

i got it to work. So i don't need help anymore.

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