back to the previous value?

[Quoc_4]

I have a question. do we have any function in C++ to get back the previous value while running the program?
For Example:
First Name: Anthony
Last Name: john
Gender:
the pointer is at the Gender value right now soo is there any way to get back up at the Last Name value to change the name in C++? I just start learning C++, thank everybody.

[Reverend Jim]

That would depend on the data structures you are using to store your data and what other variables you are maintaining. For example, it is a common practice to have a prev variable to keep track of where you were on a previous step (or a stack for deeper history). Or in the case of linked lists, a back link so you can traverse the list in either direction. If your data is being stored in an array than just subtract one from your array index.

[toneewa]

You just create that function to navigate back to redo your input. Here, I check for input during the gender input to see if the letter 'b' (back) is entered. If so, the last name function is called.

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

int navigate();
int display();

int firstn();
int lastn();
int gen();

int nav = 0;
string inputs = " ";
string first = " ";
string last = " ";
string gender = " ";

int main()
{   
    while (1)
    {
        display();
        if (nav == 0) {
            firstn();
    }

        if (nav == 1){
            lastn();
    }

        if (nav == 2) {
            gen();
    }
        nav = 0;    
        }
    return 0;
}

int navigate()
{
    std::cout << "\n";
    if (nav == 0) {
        inputs = "First Name: ";
    }
    if (nav == 1)
    {
        inputs = "Last Name: ";
    }
    if (nav == 2)
    {
        inputs = "Gender: ";

    }

    return 0;
}

int display()
{   
    navigate();

    return 0;
}

int firstn()
{

    std::cout << inputs;
    std::cin >> first;
    nav = nav + 1;
    display();

    return 0;
}

int lastn()
{

    std::cout << inputs;
    std::cin >> last;
    nav = nav + 1;
    display();
    gen();
    return 0;
}

int gen()
{
    char gender[50], str[50]{};
    int len1, len2; 
    std::cout << inputs;
    std::cin >> gender;
    str[0] = 'b';
    len1 = strlen(gender);
    len2 = strlen(str);

    if (nav > 2) {

        nav = 0;
    }
    if (len1 == len2)
    {
        if (strcmp(gender, str) == 0) {
            nav = 1;
            display();
            lastn();
        } else
            std::cout << "\n";
    }
    else
        std::cout << "\n";

    nav = nav + 1;

    display();

    return 0;
}

First Name: Bill

Last Name: Gates

Gender: b

Last Name: Murray

Gender: M