C: Logical Operators - Logical OR(||) (Page 4 of 4 )
Lastly we come to our dear buddy the Logical OR(||). This bad boy checks to see if any one of two expressions is true. Here we will use the OR to shorten our code from the previous example:
#include <stdio.h>
int main()
{
char c,d;
char numone='1';
char numtwo='3';
printf("I am thinking of a number between 1-10.n");
printf("Please enter a number: ");
c=getchar();
fflush(stdin);
printf("nnI am thinking of another number between 1-10.n");
printf("Please enter a second number: ");
d=getchar();
if(c==numone && d==numtwo)
{
printf("nnYou guessed both numbers in the proper sequence!n");
printf("nYou're a genius! An ugly genius, but a genius nonetheless!");
}
else if(c==numtwo && d==numone)
{
printf("nnYou guessed the right numbers but in the wrong sequence!");
printf("nWhat a boob.");
}
else if(c==numone && ! (d==numtwo) || (! (c==numone) && d==numtwo))
{
printf("nnYou guessed one number right.nn");
}
else
{
printf("nnYou have failed to guess the numbers in the proper sequencenn");
printf("Dumb and ugly...what a shame!n");
}
return(0);
}
In this example you will notice that our OR(||) did not save us all that much space. In bigger programs it can save you quite a bit of space and time. This program works in the same manner as the prior one, with a slight change in some of the text we print out. It uses the || to say if "c" is equal to numone AND "d" is not equal to numtwo OR if "c" is not equal to numone AND "d" is equal to numtwo, then print out:
You guessed one number right.
You will note that we are seeking the right number in the right sequence. So if the user typed in say 6 and then 1, they would wind up with the following:
You have failed to guess the numbers in the proper sequence
Dumb and ugly...what a shame!
This is because 1 matches the first number and not the second and they typed it out of sequence. If we weren't concerned with the order in which they typed the numbers, we could simply add more Ors and be fine.
Well that's it for this article. In our next action-packed episode we will finally and at long last discuss loops in C. So stick around. You might learn something.
Till then...
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