Segmentation fault

[tatrantea]

Hi,

I know this problem is easy, but I can't figure it out by myself. I'm trying to generate 100 random numbers and then plot a histogram. For some reason, when I'm trying to run it, my Linux terminal only gives me a "Segmentation error" message.

Here is the code:

srand((unsigned)time(0));
int j, k, index;
int random_integer[index];
double number[index];
int bin[j];
std::cout.precision(4);
std::cout.width(4);
for(int index=0; index<100; index++) {
random_integer[index] = (rand()%1000) + 1;
number[index] = random_integer[index] / 1000;
cout << random_integer << number << endl; // generate 100 random numbers
for (j=0; j<100; j++)
{ if ((random_integer[j] >= 0.01*j) && (random_integer[j] < 0.01*j+0.01) ) {bin[j]++;}
}; // put numbers into bins, by their values
for (j=0; j<100; j++)
{cout << j*0.01 << "-" << 0.01*j+0.009 << ": ";
for (k=0; k<bin[j]; k++) {cout << "*"; }
cout << "\n"; // create a histogram from *s 

By any chance, do you know how to fix it? Or, in general, how to solve segfaults? Thank you very much in advance!

[kooth]

To what value is index initialized when you declare your array of integers for random_integer? Try setting index = 100 before you declare random_integer.

[tatrantea]

Thank you, kooth! It really helped!

[kooth]

I glad it helped! Make sure you mark this as "solved" please. Good luck!