C program to represent the alphabets in spiral pattern

The spiral pattern to represent the alphabets is as follows −

The logic used to represent the alphabets in spiral model is as follows −

if(rows<=13 && rows>=1){
   for(i=1;i<=rows*2;i+=2){
      if(k%2==1){
         printf("%c %c",i+64,i+65);
         k++;
      }else{
         printf("%c %c",i+65,i+64);
         k++;
      }
      printf("
");
   }
}
else{
   printf("Please Enter from 1 to 13 only
");
}

Program

Following is the C program to represent the alphabets in spiral pattern −

 Live Demo

#include<stdio.h>
main(){
   int i,rows,k=1;
   printf("Enter number of Rows for Spiral Alpha Pattern from 1 to 13
");
   scanf("%d",&rows);
   if(rows<=13 && rows>=1){
      for(i=1;i<=rows*2;i+=2){
         if(k%2==1){
            printf("%c %c",i+64,i+65);
            k++;
         }else{
            printf("%c %c",i+65,i+64);
            k++;
         }
         printf("
");
      }
   }else{
      printf("Please Enter from 1 to 13 only
");
   }
}

Output

When the above program is executed, it produces the following result −

Enter number of Rows for Spiral Alpha Pattern from 1 to 13
10
A B
D C
E F
H G
I J
L K
M N
P O
Q R
T S