PieChart [QWidget] - Error: SIGFPE Arithmetic Problem [C++]

[NovaPrimera]

Dear Qt Community.

The problem I think is within my loops,when I try to change the color of my brush to a random colour. I did try to change the resultV and other arithmetic variables ...it doesn`t help. I have a SIGFPE Arithemetic problem then Qt informs me of 'Signal Recieved' , the inferior stopped because it recieved a signal from the operating system . Signal name : ? , Signal meaning: unknown.

Please can anyone kindly help me? [I did have problems with Qt before and had to reinstall it because my main class could not detect it`s files. I am using the lastest version of Qt] .Any help is much appreciated.

*CHANGES:

1. 360/sum changed to 'sum/360;' [Fixes SIGFPE Arithmetic Problem]

**NEW PROBLEM:

1. My codes breakpoint stops at the empty method:
   PieChartWidget::PieChartWidget(QWidget *parent) : QWidget(parent)

Code: [piechartwidget.cpp]

#include "piechartwidget.h"

#include <QColor>
#include <QPainter>

PieChartWidget::PieChartWidget(QWidget *parent) : QWidget(parent)
{

}

void PieChartWidget::paintEvent(QPaintEvent *)
{
QVector<int> vector(5);
vector.append(10);
vector.append(20);
vector.append(5);
vector.append(1);
vector.append(50);

int sum=0;
int angleV=0;
int resultV=0;
int resultVV =0;

QPainter painter(this);
QRectF size = QRectF(10,10,this->width()-10,this->width()-10);

int *data = vector.data();

for (int i = 0; i < 5; ++i){
    sum += data[i];
}

angleV = sum/360;

for (int i = 0; i < 5; ++i){
    if(i == 0){
        resultV = data[i] * angleV;
        painter.setBrush(palette().brush(QPalette::Text));
        painter.drawPie(size , 0 , resultV*16);
     }
     else {

        resultV = data[i] * angleV;
        resultVV = data[i-1] * angleV;

        painter.setBrush(palette().brush(QPalette::Text));

        painter.drawPie(size , resultVV*16 , resultV*16);
    }
}

}

[mrjj]

Hi
Good you fixed the SIGFPE, but im not sure why its an issue
it stops at the constructor?

[SGaist]

Hi and welcome to devnet,

@NovaPrimera said in PieChart [QWidget] - Error: SIGFPE Arithmetic Problem [C++]:

360/sum changed to 'sum/360;' [Fixes SIGFPE Arithmetic Problem]

You know that these two statements are not equivalent ? A division is not a permutative operation.

What you need to do here is check that sum is not zero and if it is, don't do the division.

[NovaPrimera]

@SGaist Thank you,Sir that was my problem all along.