How do I print XOXO in pyramid

Question

1.80/5 (2 votes)

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I'm able to print all O in pyramid, but I don't know how to print X and O in it.

For example:

Input:
5

output:

    O
   OXO
  OXOXO
 OXOXOXO
OOOOOOOOO

What I have tried:

C++

#include 

int main() {
    int i,j,h ;
    scanf("%d",&h);

    for(i=1;i=h-(i-1)&& j<=h+(i-1))
                printf("O") ;
            else
                printf(" ") ;
        }
        printf("\n") ;

    }
        return 0;
}

Posted 1-Nov-21 5:55am

Member 15412851

Updated 1-Nov-21 6:59am

CHill60

v2

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Comments

CHill60 1-Nov-21 12:03pm

There appears to be some code missing - where is the if to go with the else for example?

jeron1 1-Nov-21 12:06pm

So the last line printed should not have the XOXO pattern?

2 solutions

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KarstenK · Answer 1 · 2021-11-01T06:59:00

Solution 2

You need a triple print output for the empty space. So a string " XO" may do the job when indexing from 0 to 2.

C++

print(int index) {
 switch( index ) {
 case 0:
  print(" ");
  break;
  // ...
}
}

Posted 1-Nov-21 6:59am

KarstenK

OriginalGriff · Answer 2 · 2021-11-01T06:30:00

Solution 1

Have a variable which you toggle from 'O' to 'X' each time you printf it: set it to 'O' at the start of each line, and make the last line a special case.

Hint: have a look at the C XOR instruction: C Bitwise Operators: AND, OR, XOR, Complement and Shift Operations[^] - there is a way to use that to toggle it.

Posted 1-Nov-21 6:30am

OriginalGriff

Comments

Mike Hankey 1-Nov-21 12:43pm

What about using the MOD (%) operator?

Seems like just the ticket here!

OriginalGriff 1-Nov-21 12:50pm

Use XOR and you need no test! :D