Display pattern using C

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/* Write a program to display the following pattern

ABCDEDCBA
ABCD   DCBA
ABC         CBA
AB               BA
A                     A

*/

#include<stdio.h>

void main()
{
char ch;
int i,j,m;

printf("Enter the height of the pattern " );
scanf("%d",&m);

for(i=0;i<=m/2;i++)
{
ch='A';
for(j=0;j<m;j++)
{
if(j>m/2-i && j<m/2+i)
printf(" ");
else
printf("%c",ch);

if(j>=m/2)
ch--;
else
ch++;

}
printf("\n");
}
}

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