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  1. // Author:     Nicholas Dornelles Franceschini
  2. // Filename:   
  3. // Date:       September, 2014
  4. // Compiler:   Quincy 2005 ver. 1.3
  5. // OS:         Windows 7 SP1
  6. // Assigned:   September 9th
  7. // Due:        September 19th
  8. // Description: This program will mimic the cstring header
  9. //				file, giving access to functions that will
  10. //				count the characters in a string, compare
  11. //				strings, copy one string onto another and
  12. //				concatenate two strings.
  13. ///////////////////////////////////////////////////////////
  14.  
  15.  
  16. // System header files
  17. #include <iostream>
  18.  
  19.  
  20. // C-String Function Prototypes
  21. int ndfStrLen(const char * const); 
  22. void ndfStrCpy(char * const, const char * const); 
  23. void ndfStrCat(char [], const char []); 
  24. int ndfStrCmp(const char [], const char []); 
  25. void ndfOutLen(const char * const, const char * const);
  26.  
  27.  
  28. // control function
  29. int main()
  30. {
  31. 	char array1[100] = "lol";
  32. 	char array2[100] = "lol";
  33.  
  34. 	std::cout << "Please enter two strings. Hit enter after each one." << std::endl;
  35. 	std::cin.getline(array1, 99, '\n');
  36. 	std::cin.getline(array2, 99, '\n');
  37. 	std::cout << std::endl;
  38.  
  39. 	ndfOutLen(array1, array2);
  40. 	std::cout << std::endl;
  41.  
  42. 	ndfStrCmp(array1, array2);
  43. 	std::cout << std::endl;
  44.  
  45. 	ndfStrCpy(array2, array1);
  46. 	std::cout << array1 << std::endl;
  47. 	std::cout << array2 << std::endl;
  48. 	std::cout << std::endl;
  49.  
  50. 	ndfOutLen(array1, array2);
  51. 	std::cout << std::endl;
  52.  
  53. 	ndfStrCat(array2, array1);
  54. 	std::cout << "String \"" << array2 << "\" is " << ndfStrLen(array2) << " characters long." << std::endl;
  55.  
  56. 	ndfStrCmp(array1, array2);
  57. 	std::cout << std::endl;
  58.  
  59.  
  60. 	return 0;
  61. }
  62.  
  63.  
  64. ///////////////////////////////////////////////////////////
  65. // Purpose: This function counts the number of characters
  66. //			in a string.
  67. // Input:	One char array containing a string.
  68. // Output:	An integer of value equal to the number of
  69. //			characters, minus the null, in the provided
  70. //			char array.
  71. int ndfStrLen(const char * const chArray1) 
  72. {
  73. 	int counter = 0;
  74. 	char content = '\0';
  75. 	bool isNull = false;	
  76.  
  77. 	// This loops through the char array until it finds a
  78. 	// null char. If it does not, it adds one to counter,
  79. 	// if it does, isNull becomes TRUE, closing the loop
  80. 	// and returning counter, which will contain a number
  81. 	// equivalent to the number of chars excluding the \0
  82. 	while(isNull == false)
  83. 	{
  84. 		content = *(chArray1 + counter);
  85. 		if(content == '\0')
  86. 		{
  87. 			isNull = true;
  88. 		}
  89. 		counter++;
  90. 	}
  91.  
  92. 	// returns the total number of chars in the array minus
  93. 	// the null char.
  94. 	return counter - 1;
  95. }
  96.  
  97. ///////////////////////////////////////////////////////////
  98. // Purpose: This function copies the second char array
  99. //			into the first, overwriting what it originally
  100. //			had in it and assuming it is big enough.
  101. // Input:	Two char arrays.
  102. // Output:	None, this function will edit the array.
  103. void ndfStrCpy(char * const chArray1, const char * const chArray2)
  104. {
  105. 	int counter = 0;
  106. 	char content = '\0';
  107. 	bool isNull = false;
  108.  
  109. 	// This loops through the second char array, copying
  110. 	// the char into the first array, until it finds a
  111. 	// null char. If it does not; it adds one to counter,
  112. 	// if it does; isNull becomes TRUE, closing the loop.
  113. 	while(isNull == false)
  114. 	{
  115. 		content = *(chArray2 + counter);
  116. 		*(chArray1 + counter) = content;
  117. 		if(content == '\0')
  118. 		{
  119. 			isNull = true;
  120. 		}
  121. 		counter++;
  122. 	}
  123.  
  124. 	return;
  125. }
  126.  
  127. ///////////////////////////////////////////////////////////
  128. // Purpose: This funtion adds the second char array to the
  129. //			first one and assumes that there is enough
  130. //			space for it.
  131. // Input:	Two char arrays.
  132. // Output:	None, this function will edit the array.
  133. void ndfStrCat(char chArray1[], const char chArray2[]) 
  134. {
  135. 	int counter = 0;
  136. 	char content = '\0';
  137. 	bool isNull = false;
  138. 	int length = 0;
  139.  
  140. 	// This figures out the size of the first array
  141. 	length = ndfStrLen(chArray1);
  142.  
  143. 	// This loops through both arrays, assigning chars from
  144. 	// second array to the end of the first array.
  145. 	while(isNull == false)
  146. 	{
  147. 		content = chArray2[counter];
  148. 		chArray1[length + counter] = content;
  149. 		if(content == '\0')
  150. 		{
  151. 			isNull = true;
  152. 		}
  153. 		counter++;
  154. 	}
  155.  
  156. 	return;
  157. }
  158.  
  159. ///////////////////////////////////////////////////////////
  160. // Purpose: This function will compare 2 char arrays.
  161. // Input:	Two char arrays.
  162. // Output:	An integer; positive if array 1 is bigger, 0 if
  163. //			they are equal or negative is array 2 is bigger
  164. int ndfStrCmp(const char chArray1[], const char chArray2[]) 
  165. {
  166. 	int counter = 0;
  167. 	char contentArr1 = '\0';
  168. 	char contentArr2 = '\0';
  169. 	bool isDone = false;
  170. 	int result = 0;
  171.  
  172.  
  173. 	while(isDone == false)
  174. 	{
  175. 		contentArr1 = chArray1[counter];
  176. 		contentArr2 = chArray2[counter];
  177.  
  178. 		if(contentArr1 == '\0' || contentArr2 == '\0')
  179. 		{
  180. 			isDone = true;
  181. 		}
  182. 		else
  183. 		{
  184. 			result = contentArr1 - contentArr2;
  185.  
  186. 			if(result > 0)
  187. 			{
  188. 				isDone = true;
  189. 				std::cout << chArray1 << " is greater than " << chArray2 << "." << std::endl;
  190. 			}
  191. 			else if(result < 0)
  192. 			{
  193. 				isDone = true;
  194. 				std::cout << chArray1 << " is less than " << chArray2 << "." << std::endl;
  195. 			}
  196. 		}
  197. 		if(result == 0)
  198. 		{
  199. 			std::cout << "The strings are equal." << std::endl;
  200. 		}
  201. 		counter++;
  202. 	}	
  203.  
  204. 	return result;
  205. }
  206.  
  207. ///////////////////////////////////////////////////////////
  208. // Purpose: This function prints both arrays and their
  209. //  		lengths.
  210. // Input:	Two char arrays.
  211. // Output:	Array and size to screen, nothing internally.
  212. void ndfOutLen(const char * const chArray1, const char * const chArray2)
  213. {
  214. 	std::cout << "String \"" << chArray1 << "\" is " << ndfStrLen(chArray1) << " characters long." << std::endl;
  215. 	std::cout << "String \"" << chArray2 << "\" is " << ndfStrLen(chArray2) << " characters long." << std::endl;
  216.  
  217. 	return;
  218. }
Success #stdin #stdout 0.01s 5524KB
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stdin
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Standard input is empty
stdout
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Please enter two strings. Hit enter after each one.

String "" is 0 characters long.
String "" is 0 characters long.

The strings are equal.




String "" is 0 characters long.
String "" is 0 characters long.

String "" is 0 characters long.
The strings are equal.
https://ideone.com/Savv4v
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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