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not responding

Started by sevak Jul 10, 2004 at 4:54 PM 5 replies 1.3k views

Original Post

Jul 10, 2004 at 4:54 PM

When I run this program it stops responding can someone explain to me why this happens. What this program is supposed to do is find the prime numbers between 1 and 100 #include <iostream> #include <stdlib.h> using namespace std; int main(int argc, char *argv[]) { for(int i = 1;i < 100;i++) { for(int x=0;x <= 9 && x != i;x++) { if((i % x) == 0) cout << i << endl; } } system("PAUSE"); return 0; }

serratemplar

125

serratemplar

Jul 10, 2004 at 5:01 PM

Why are you using the system() function? When it bails you should be able to see it...just leave the console window you ran it in open.

Also, there's no reason to keep flushing the stream...that might be pissing your computer off. Use "\n" intstead of endl.

mike25025

Jul 10, 2004 at 5:01 PM

Unhandled exception at 0x004323a4 in f.exe: 0xC0000094: Integer division by zero.

it happens in this line: if((i % x) == 0)

serratemplar

125

serratemplar

Jul 10, 2004 at 5:07 PM

Oh yeah =) cause x starts at 0 and you immediately divide by it.

You don't want to do that.

Etnu

108

Etnu

Jul 10, 2004 at 5:07 PM

You're doing a modulous operator with a 0 divisor.

sevak

Author

sevak

Jul 10, 2004 at 5:19 PM

O thanks I'll switch x to start at one and see what happens. However, shouldn't the compiler warn me about this?

kdogg

Jul 10, 2004 at 7:15 PM

Compilers generally won't complain when you're dividing by a variable. Although it's obvious looking at the code that x will be 0 when you divide by it, the compiler really doesn't know what value x will have at any given time. Generally, run time errors are up to you to figure out (though a debugger can often help you out).

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