C program to represent the numbers in spiral pattern

The spiral pattern to represent the numbers is shown below −

The logic applied to print the numbers in spiral pattern is as follows −

for(i=1;i<=rows*2;i+=2){
   if(k%2==1){
      printf("%3d %3d",i,i+1);
      k++;
   }else{
      printf("%3d %3d",i+1,i);
      k++;
   }
   printf("
");
}

Program

Following is the C program for representing the numbers in spiral pattern −

#include<stdio.h>
main(){
   int i,rows,k=1;
   printf("Enter number of Rows for Spiral Pattern
");
   scanf("%d",&rows);
   for(i=1;i<=rows*2;i+=2){
      if(k%2==1){
         printf("%3d %3d",i,i+1);
         k++;
      }else{
         printf("%3d %3d",i+1,i);
         k++;
      }
      printf("
");
   }
}

Output

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

Enter number of Rows for Spiral Pattern
10
1 2
4 3
5 6
8 7
9 10
12 11
13 14
16 15
17 18
20 19