error: expected unqualified-id before '.' token??

[sam23]

Hi all, im new to this programming language and i tried to use my Xcode to build and run this code but i got a error :(, and another error is
i need a help guys

#include <GLUT/glut.h>
#include <stdlib.h>
#include <math.h>
 
const GLdouble twoPi =6.283185;
 
class scrPt {
public:
    GLint x, y;
};
 
GLsizei winWidth = 400, winHeight =300;
 
void init (void)
{
    glClearColor (1.0,1.0,1.0,1.0);
 
    glMatrixMode (GL_PROJECTION);
    gluOrtho2D (0.0,200.0,0.0,150.0);
}
. >>>>> the error is here (error: expected unqualified-id before '.' token)
.
.// Midpoint routines for displaying a circle
 
void pieChart (void)
{
    scrPt circCtr, piePt;
    GLint radius = winWidth/4;
 
    GLdouble sliceAngle, previosSliceAngle = 0.0;
 
    GLint k, nSlices = 12;
    GLfloat dataValues[12] = {10.0,7.0,13.0,5.0,13.0,14.0,3.0,16.0,5.0,3.0,17.0,8.0};
    GLfloat dataSum =0.0;
 
    circCtr.x = winWidth/2;
    circCtr.y =winHeight / 2;
    circleMidpoint (circCtr, radius);
 
    for (k =0; k< nSlices; k++)
        dataSum += dataValues[k];
 
    for (k =0; k< nSlices; k++) {
        sliceAngle =twoPi * dataValues[k]/ dataSum + previousSliceAngle;
        piePt.x = circCtr.x + radius *cos (sliceAngle);
        piePt.y = circCtr.y + radius *sin (sliceAngle);
        glBegin (GL_LINES);
        glVertex2i(circCtr.x, circCtr.y);
        glVertex2i(piePt.x, piePt.y);
        glEnd ();
        previousSliceAngle = sliceAngle;
    }
}
 
 
void displayFcn (void)
{
    glClear (GL_COLOR_BUFFER_BIT);
    glColor3f (0.0,0.0,1.0);
    pieChart (); >>>>>>>>>>>>>>>>( error: 'pieChart' was not declared in this scope )
    glFlush ();
}
void winReshapeFcn (GLint newWidth, GLint newHeight)
{
    glMatrixMode (GL_PROJECTION);
    glLoadIdentity ();
    gluOrtho2D (0.0, GLdouble (newWidth), 0.0, GLdouble (newHeight));
 
    glClear (GL_COLOR_BUFFER_BIT);
 
    /* Reset diaply-window size parameters. */
    winWidth = newWidth;
    winHeight = newHeight;
 
}
 
int main (int argc, char** argv)
{
    glutInit (&argc, argv);
    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
    glutInitWindowPosition (100,100);
    glutInitWindowSize (winWidth,winHeight);
    glutCreateWindow ("Pie Chart");
 
    init();
    glutDisplayFunc (displayFcn);
    glutReshapeFunc (winReshapeFcn);
 
    glutMainLoop ();
 
}

[newb16]

. >>>>> the error is here (error: expected unqualified-id before '.' token)
.
.//

All these three dots (before '>>>', on the next line , and before '//'), are they in the code? Why are they there?

[sam23]

yes they are in the code ... its refer to the Midpoint routines for displaying a circle.

[donbock]

Those periods don't look like legal C syntax. What do you expect them to do?

[sam23]

Midpoint routines for displaying a circle

[Banfa]

Have you tried just removing lines 21,22 and 23 and compiling the code?

[sam23]

Banfa : yes i tried but its end up with error and when i correct the error my output is a pie chart without a circle :)

[donbock]

@sam23
Your source code snippet consists of

• Include some header files (lines 1-3)
• Define a global variable (line 5)
• Define class scrPt (line 7)
• Define two more global variables (line12)
• Function init (lines 14-20)
• Three periods and a comment (lines 21-23)
• Function pieChart (lines 25-53)
• Function displayFcn (lines 56-62)
• Function winReshapeFcn (lines 63-75)
• Function main (lines 77-end)

Why do you so adamantly believe that the compiler interprets three periods as the instructions for inserting midpoint routines for displaying a circle?

Much more likely is that these periods were meant to be interpreted as an ellipsis in whatever source you cut and pasted this code from. That is, they indicate that a block of code (not needed to make the point) was omitted.

[donbock]

@sam23
At line 38, pieChart calls function circleMidpoint -- passing it the center and radius. You don't have a circleMidpoint function. You will need to write it.

[sam23]

donbock : i really dont understand :(
My lecturer just gave this coding and ask us to try to run it..
I dont have idea how to write fucntion for this circle Midpoint !