ABCD pattern2

The need:

This program was asked by a reader.

The code:
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#include<stdio.h>
main()
{
    char z;
    int j,i,k;
    printf("Enter the number of rows..(1 to 26)\t");
    scanf("%d",&k);
    if(k<1||k>26)
    {
        printf("\nThe number entered was not in range of 1 to 26\n");
        printf("exiting...\n");
        exit(0);
    }
    printf("\n\n");
    for (i=0;i<k;i++)
    {
        z = 'A';
        for (j=0;j<k;j++)
        {   
            if(j<k-i)
            printf ("%c  ",z);
            else
            printf("_  ");
            z++;
        }
        z--;
        for (j=k;j>0;j--)
        {   
            if(j<=k-i)
            printf ("%c  ",z);
            else
            printf("_  ");
            z--;
        }
    printf("\n\n");
    }
}

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Output:

output of the program will be some thing like this:

sample output when input 8 is given.

A  B  C  D  E  F  G  H  H  G  F  E  D  C  B  A  

A  B  C  D  E  F  G  _  _  G  F  E  D  C  B  A  

A  B  C  D  E  F  _  _  _  _  F  E  D  C  B  A  

A  B  C  D  E  _  _  _  _  _  _  E  D  C  B  A  

A  B  C  D  _  _  _  _  _  _  _  _  D  C  B  A  

A  B  C  _  _  _  _  _  _  _  _  _  _  C  B  A  

A  B  _  _  _  _  _  _  _  _  _  _  _  _  B  A  

A  _  _  _  _  _  _  _  _  _  _  _  _  _  _  A