[SOLVED] C++ help - compiler ignoring FOR loop?

Arcibi

So I'm writing this console application in Dev-C++ to script a POV-Ray file that generates a bunch of random spheres, right

This is the source code (spoilered for long maybe):

#include <cstdlib>
#include <iostream>
#include <fstream>
#include <time.h>

using namespace std;

int main(int argc, char *argv[])
{
     fstream file_op("random.pov",ios::out);
     int x;
     int y;
     int z;
     int i = 0;
     int rad = 10;
     float r;
     float g;
     float b;
     srand(time(NULL));
     
     file_op << "camera{location <0,50,-100> look_at <0,0,0> }" << endl;
     file_op << "background{ color blue 1 green .5 red .5 }" << endl;
     file_op << "light_source{<30,50,-30> color red 1 green 1 blue 1}" << endl;
     file_op << "light_source{<-30,50,30> color red 1 green 1 blue 1}" << endl;
     
     cout << "camera{location <0,50,-100> look_at <0,0,0> }" << endl;
     cout << "background{ color blue 1 green .5 red .5 }" << endl;
     cout << "light_source{<30,50,-30> color red 1 green 1 blue 1}" << endl;
     cout << "light_source{<-30,50,30> color red 1 green 1 blue 1}" << endl;
     
     for(i = 0; i > 100; i++)
     {
         x = (rand() & 100 - 1) - 50;
         y = (rand() & 100 - 1) - 50;
         z = (rand() & 100 - 1) - 50;
         r = rand()/(float(RAND_MAX)+1);
         g = rand()/(float(RAND_MAX)+1);
         b = rand()/(float(RAND_MAX)+1);
         
         file_op << "sphere { <" << x << ", " << y << ", " << z << " >, "
                 << rad << " texture{ pigment {color rgbf<"
                 << r << ", " << g << ", " << b << ", 0.6>}"
                 << "finish {phong 1}}}" << endl;
         
         cout << "sphere { <" << x << ", " << y << ", " << z << " >, "
              << rad << " texture{ pigment {color rgbf<"
              << r << ", " << g << ", " << b << ", 0.6>}"
              << "finish {phong 1}}}" << endl;
     }
     
    file_op.close();
    system("PAUSE");
    return EXIT_SUCCESS;
}

cout is basically there just to put visual confirmation of what I'm writing to the file, on the screen

Problem is, it's ignoring the FOR loop entirely. Nothing being written to the screen, and nothing being written to the file after the initial camera, background, and lightsource commands

Any ideas why the loop seems to be totally ignored?

His Corkiness

The condition "i > 100" is never true. The loop will only start, and continue, if that condition is true. Most likely you want "i < 100".

Not quite related, but Dev-C++ is outdated. A newer IDE is Code::Blocks, or alternatively you can use Visual Studio Express Edition.

DrFrylock

for(i = 0; i > 100; i++)

Switch the greater-than sign to a less-than sign. The middle component of a for loop is the condition that must be true for the loop to iterate. Since you set i = 0 to begin with, and then see if i > 100, the loop will never iterate since i is never greater than 100.

E:F,B

Arcibi

Well, I feel like an idiot

Thanks for the help, the program works as intended now