Pyramid Problem No. 40

 Q.40 Write a C program to display the following square character triangle:

     A
    AB
   ABC
  ABCD
 ABCDE
  ABCD
   ABC
    AB 
     A

Solving in C:

#include <stdio.h>
    int main(){
        int row,col,ch; ///charecter=ch
        for(row=1; row<=5; row++){
            for(col=1; col<=5-row; col++) printf(" ");
            for(col=1,ch=65; col<=row; col++,ch++) printf("%c",ch); 
            printf("\n");
        }
        for(row=5-1;row>=1; row--){
          for(col=5; col>=row+1; col--) printf(" ");
          for(col=1,ch=65; col<=row; col++,ch++) printf("%c",ch);
            printf("\n");
        }
    
        return 0;
    }