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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4.  
  5. //drawTriangle: Called on to draw the triangle
  6. void drawTriangle(int size, char direction, char pattern);
  7.  
  8. //main: Gathers input and calls drawTriangle
  9.  
  10. //lowercase a c character by reference
  11. char tolower(char &c)
  12. {
  13. 	if(c > 0x40 && c < 0x5B)
  14. 		c += 0x20;
  15. 	return c;
  16. }
  17.  
  18. int strlen(char *str)
  19. {
  20. 	char *c = str;
  21. 	int i;
  22. 	for(i = 0; *c!=0; ++i, ++c);
  23.  
  24. 	return i;
  25. }
  26.  
  27. bool strstr(char *in, char c)
  28. {
  29. 	char *str = in;
  30. 	for(int i = 0; i < strlen(in); ++str, ++i)
  31. 		if(*str==c)
  32. 			return true;
  33.  
  34. 	return false;
  35. }
  36.  
  37. void ScanInputChar(const char *prompt, char &input, int len, char* expected)
  38. {
  39. 	do
  40. 	{
  41. 		char buf[16];
  42. 		printf(prompt);
  43. 		fgets(buf, 16, stdin);
  44. 		input = buf[0];
  45. 		tolower(input);
  46. 	}
  47. 	while(!strstr(expected, input));
  48. }
  49.  
  50. void ScanInputNum(const char *prompt, int &input, int expectedmin, int expectedmax)
  51. {
  52. 	do
  53. 	{
  54. 		char buf[16];
  55. 		printf(prompt);
  56. 		fgets(buf, 16, stdin);
  57. 		input = atoi(buf);
  58. 	}
  59. 	while(input < expectedmin || input > expectedmax);
  60. }
  61.  
  62. int main() {
  63.     //Variables which will be filled by user
  64.     int size;
  65.     char direction, pattern;
  66.  
  67.     //Getting input from user
  68. 	ScanInputNum("Please enter the size of your triangle (Must be between 1-15)\n", size, 1, 15);
  69. 	ScanInputChar("Please enter the direction of your triangle (Either F or B)\n", direction, 1, "FBfb");
  70. 	ScanInputChar("Please enter the pattern for your triangle (V for vertical, H for horizontal, or N for none)\n", pattern, 1, "VHNvhn");
  71.  
  72.     printf("\n\nHere is your triangle:\n\n");
  73.  
  74.     //Calling drawTirangle and sending the user input
  75.     drawTriangle(size, direction, pattern);
  76.  
  77. 	system("pause");
  78.  
  79. 	return 0;
  80. }
  81.  
  82. //drawTriangle: Draws the triangle using the users parameters
  83. void drawTriangle(int size, char direction, char pattern) 
  84. {
  85. 	int iStart = 0;
  86. 	int iPos = 0;
  87. 	int iSize = size;
  88. 	int iIncrement = 0;
  89. 	bool bDirection = (direction == 'b'); //true if backward
  90.  
  91. 	if(bDirection)
  92. 		iIncrement = -1;
  93. 	else
  94. 		iIncrement = 1;
  95.  
  96. 	for(int i = 0; i < size; ++i,  iPos+=iIncrement)
  97. 	{
  98. 		if(bDirection)
  99. 		{
  100. 			for(int k = size-i;k>1; k--)
  101. 				printf("  ");
  102. 		}
  103.  
  104. 		for(int j = 0; j != iPos + iIncrement; j+=iIncrement)
  105. 		{
  106. 			if(bDirection)
  107. 				printf(" ");
  108.  
  109. 			if(pattern == 'v')
  110. 			{	
  111. 				if((j + ((i%2)*bDirection))%2==0)
  112. 					printf("#");
  113. 				else
  114. 					printf("*");
  115. 			}
  116. 			else if(pattern == 'h')
  117. 			{
  118. 				if(i%2==0)
  119. 					printf("#");
  120. 				else
  121. 					printf("*");
  122. 			}
  123. 			else
  124. 			{
  125. 				printf("*");
  126. 			}
  127.  
  128. 			if(!bDirection)
  129. 				printf(" ");
  130.  
  131. 		}
  132. 		printf("\n");
  133. 	}
  134. }
Success #stdin #stdout #stderr 0s 3460KB
comments (?)
stdin 
10
b
v
stdout 
Please enter the size of your triangle (Must be between 1-15)
Please enter the direction of your triangle (Either F or B)
Please enter the pattern for your triangle (V for vertical, H for horizontal, or N for none)


Here is your triangle:

                   #
                 * #
               # * #
             * # * #
           # * # * #
         * # * # * #
       # * # * # * #
     * # * # * # * #
   # * # * # * # * #
 * # * # * # * # * #
stderr 
sh: 1: pause: not found
https://ideone.com/qKxXaV
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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