Pyramid Problem No. 39

 Q.39 Write a C program to display the following square character triangle:

  ABCDCBA
   ABCBA
    ABA
     A

Solving in C:

    #include <stdio.h>
    int main(){
        int row,col,ch; ///charecter=ch
        for(row=4; row>=1; row--){
            for(col=1; col<=4-row; col++) printf(" ");
            for(col=1,ch=65; col<=row; col++,ch++) printf("%c",ch); 
            for(col=row-1,ch=64+row-1; col>=1; col--,ch--)printf("%c",ch);
            printf("\n");
        }
        return 0;
    }