1. #include <stdio.h>
  2.  
  3. void main()
  4.  
  5. {
  6.  
  7. // Incremental counting variables, used for counters for loops
  8. int i, j, x;
  9.  
  10. // Regular variables to determine tree size, amount of spaces and total spaces
  11. int tree_Size, spaces, total_Spaces;
  12.  
  13. // Character variables for each characer inputted by the user
  14. char tree_Characters, tree_Top, tree_Trunk, tree_Base, tree_Middle, null_Terminator;
  15.  
  16. printf("Enter characters to use --> ");
  17.  
  18.  scanf("%c", &tree_Top);
  19.  
  20.  // Determine whether the first character holds any data
  21.  if (tree_Top == '\n') {
  22.    printf("Fail, tree_Top is null\n");
  23.    return;
  24.    }
  25.  else if (tree_Top != '\n')
  26.    scanf("%c", &tree_Trunk);
  27.  
  28.  // Determine whether the second character holds any data
  29.  if (tree_Trunk == '\n') {
  30.    printf("Fail, tree_Trunk is null\n");
  31.    return;
  32.    }
  33.  else if (tree_Trunk != '\n')
  34.    scanf("%c", &tree_Base);
  35.  
  36.  // Determine whether the third character holds any data
  37.  if (tree_Base == '\n') {
  38.    printf("Fail, tree_Base is null\n");
  39.    return;
  40.    }
  41.  else if (tree_Base != '\n')
  42.    scanf("%c", &tree_Middle);
  43.  
  44.  // Determine whether the fourth character holds any data
  45.  if (tree_Middle == '\n') {
  46.    printf("Fail, tree_Middle is null\n");
  47.    return;
  48.    }
  49.  else if (tree_Middle != '\n')
  50.    scanf("%c", &null_Terminator);
  51.  
  52.  /* Determine whether the fifth character holds any data, if it does, display
  53.     an error message and terminate the program */
  54.  if (null_Terminator != '\n') {
  55.    printf("Fail, null_Terminator is NOT null\n");
  56.    return;
  57.    }
  58.  // If it does not hold data, continue with program execution
  59.  else if (null_Terminator == '\n') { 
  60.    printf("Enter size of tree --> ");
  61.       scanf("%d", &tree_Size);
  62.       // Check if size of tree does not exceed 20 or fall below 1
  63.       if (tree_Size < 1 || tree_Size > 20) {
  64.          printf("\n");
  65.          printf("ERROR: Must enter a tree size between 1 and 20!");
  66.          }
  67.       else
  68.          {
  69.             //For handling top part of tree
  70.             for (i = 0; i <= tree_Size; i++) {
  71.                printf("\n");
  72.                total_Spaces = tree_Size - i;
  73.  
  74. 		         //Determine spaces before each number for pyramid
  75.                for (spaces = 1; spaces <= total_Spaces; spaces++) 
  76.                   printf(" ");
  77.  
  78.                //Make first line always one number
  79.                for (j = -1; j < i; j++)
  80.                   if (j <= -1)
  81.                      printf("%c", tree_Top);
  82.                   else if (j > -1)
  83.                      printf("%c%c", tree_Top, tree_Top);
  84.             } 
  85.  
  86.             //For handling stem and base of tree
  87.             for (i = 0; i <= tree_Size; i++) {
  88.  
  89.                //if handling stem
  90.                if (i < tree_Size) {
  91.                   printf("\n");  
  92.                   for (spaces = 1; spaces <= tree_Size; spaces++)
  93.                      printf(" ");
  94.                   printf("%c", tree_Trunk);
  95.                }
  96.  
  97.                //else if handling base
  98.  
  99.                else if (i == tree_Size) {
  100.                   printf("\n");
  101.  
  102.                   for (x = 0; x < tree_Size; x++) {
  103.                      printf("%c", tree_Base);
  104.                   }
  105.  
  106.                   printf("%c", tree_Middle);
  107.  
  108.                   for (x = 0; x < tree_Size; x++) {
  109.                      printf("%c", tree_Base);
  110.                   }
  111.                }
  112.             }
  113.          }
  114.       }
  115.  
  116.    printf("\n");
  117.  
  118. }