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Lakrids · Mar 20th, 2008, 7:34 AM

Hello,

I have been programming for quite a while now, but the following behavior is one of the most weird ones I ever encountered. It really is annoying me, and I just can't get to the bottom of it. So, in short, the other day I was writing a very small program which calculates all possible solutions to a given problem. The program didn't work, and after some debugging, I was astonished that the following code just doesn't seem to work for some obscure reason. The problem is that nothing is written to the screen in the loop :

 cplusplus Syntax (Toggle Plain Text) 
#include <iostream>
 
int main() {
 
    for (double C=0.0; C<100.0; C+=0.1)
        if (C==1.0)
            std::cout << C << std::endl;
 
    return 0;
}
#include <iostream>

int main() {

    for (double C=0.0; C<100.0; C+=0.1)
        if (C==1.0)
            std::cout << C << std::endl;

    return 0;
}

The program always evaluates (C==1.0) as false. Why?

Mar 20th, 2008, 7:34 AM	#1
Lakrids Newbie Join Date: Dec 2007 Posts: 28 Rep Power: 0	Extremely weird program behavior Hello, I have been programming for quite a while now, but the following behavior is one of the most weird ones I ever encountered. It really is annoying me, and I just can't get to the bottom of it. So, in short, the other day I was writing a very small program which calculates all possible solutions to a given problem. The program didn't work, and after some debugging, I was astonished that the following code just doesn't seem to work for some obscure reason. The problem is that nothing is written to the screen in the loop : cplusplus Syntax (Toggle Plain Text) #include <iostream> int main() { for (double C=0.0; C<100.0; C+=0.1) if (C==1.0) std::cout << C << std::endl; return 0; } #include <iostream> int main() { for (double C=0.0; C<100.0; C+=0.1) if (C==1.0) std::cout << C << std::endl; return 0; } The program always evaluates (C==1.0) as false. Why?