LineEdit's

[Johnnyj2j]

How do i put text from a line edit into a string then print it out into anouther line edit????
Thanks in advance

[Zlatomir]

You get it with QString text() and set it with void setText ( const QString & ) documentation link

[Johnnyj2j]

Thanks that helped me out allot but it lead to anouther question

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <iostream>
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::on_actionClose_triggered()
{
 
}
 
void MainWindow::on_pushButton_clicked()
{
    QString Num1 = ui->lineEdit ->text();
    QString Num2 = ui->lineEdit ->text();
    ui->lineEdit_3->setText(Num1+Num2);
}
 
void MainWindow::on_pushButton_2_clicked()
{
    QString Num1 = ui->lineEdit ->text();
    QString Num2 = ui->lineEdit ->text();
    ui->lineEdit_3->setText(Num1-Num2);
}
 
void MainWindow::on_pushButton_3_clicked()
{
    QString Num1 = ui->lineEdit ->text();
    QString Num2 = ui->lineEdit ->text();
    ui->lineEdit_3->setText(Num1/Num2);
}
 
void MainWindow::on_pushButton_4_clicked()
{
    QString Num1 = ui->lineEdit ->text();
    QString Num2 = ui->lineEdit ->text();
    ui->lineEdit_3->setText(Num1*Num2);
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <iostream>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_actionClose_triggered()
{

}

void MainWindow::on_pushButton_clicked()
{
    QString Num1 = ui->lineEdit ->text();
    QString Num2 = ui->lineEdit ->text();
    ui->lineEdit_3->setText(Num1+Num2);
}

void MainWindow::on_pushButton_2_clicked()
{
    QString Num1 = ui->lineEdit ->text();
    QString Num2 = ui->lineEdit ->text();
    ui->lineEdit_3->setText(Num1-Num2);
}

void MainWindow::on_pushButton_3_clicked()
{
    QString Num1 = ui->lineEdit ->text();
    QString Num2 = ui->lineEdit ->text();
    ui->lineEdit_3->setText(Num1/Num2);
}

void MainWindow::on_pushButton_4_clicked()
{
    QString Num1 = ui->lineEdit ->text();
    QString Num2 = ui->lineEdit ->text();
    ui->lineEdit_3->setText(Num1*Num2);
}

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This is the code i used it in for a simple caculator but for some reason i get errors when useing + - * / ect how do i fix this?
thanks agin

[ChrisW67]

You cannot divide or multiply strings... they are functions you want to apply to numbers. Have a look at QString::toInt() and QString::toDouble()

[Johnnyj2j]

void MainWindow::on_pushButton_clicked()
{
    int Num1 = ui->lineEdit ->text().toInt();
    int Num2 = ui->lineEdit_2 ->text().toInt();
    QString Answer = Num1+Num2;
    QString go = Answer.toStdString();
    ui->lineEdit_3->setText(go);
}

void MainWindow::on_pushButton_clicked()
{
    int Num1 = ui->lineEdit ->text().toInt();
    int Num2 = ui->lineEdit_2 ->text().toInt();
    QString Answer = Num1+Num2;
    QString go = Answer.toStdString();
    ui->lineEdit_3->setText(go);
}

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im still cant figure it out :/ and i have read the help file... i think i made them into int but them i belive i have to make them into a string agin after i do the caculation to print them out....

[chriskon149]

void MainWindow::on_pushButton_clicked()
{
    int Num1 = ui->lineEdit ->text().toInt();
    int Num2 = ui->lineEdit_2 ->text().toInt();
    QString Answer = Num1+Num2;
    QString go = Answer.toStdString();
    ui->lineEdit_3->setText(go);
}

void MainWindow::on_pushButton_clicked()
{
    int Num1 = ui->lineEdit ->text().toInt();
    int Num2 = ui->lineEdit_2 ->text().toInt();
    QString Answer = Num1+Num2;
    QString go = Answer.toStdString();
    ui->lineEdit_3->setText(go);
}

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im still cant figure it out :/ and i have read the help file... i think i made them into int but them i belive i have to make them into a string agin after i do the caculation to print them out....

What I do is use QString::number(myNumber) to convert numbers (ints, doubles, etc) into strings.

You can try this (it should do what you want).

void MainWindow::on_pushButton_clicked()
{
     int Num1 = ui->lineEdit->text().toInt();
     int Num2 = ui->linEdit_2->text().toInt();
     int Answer = Num1 + Num2;
     ui->linEdit_3->setText(QString::number(Answer));
}

void MainWindow::on_pushButton_clicked()
{
     int Num1 = ui->lineEdit->text().toInt();
     int Num2 = ui->linEdit_2->text().toInt();
     int Answer = Num1 + Num2;
     ui->linEdit_3->setText(QString::number(Answer));
}

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I hope this helps!

Chris

[Johnnyj2j]

i changed it a little but it works thanks man