Program in C to print the character pyramid

Write a program in C to print the following character pyramid:

ABCD

CDA

AB

C

Solution:

#include<stdio.h>

int main()

{

char ch='D',n,c,r,t;

n=ch;

for(r='A'; r<=ch; r++,n--)

{

if(r=='B' || r=='D')

{

for(c='A',t='C'; c<=n; c++,t++)

{

if(c=='C' && r=='B')

printf("A");

else

printf("%c",t);

}

}

else

{

for(c='A'; c<=n; c++)

printf("%c", c);

}

printf("\n");

}

return 0;

}