Array character sequence replacement with another array sequence

In this program a character sequence in an an array is replaced with another.

 Example

 Input string : "mary had a little lamp"

 "little" needs to be replaced with "big"

 Output string : " "mary had a big lamp"

	#include "pch.h"
	#include <iostream>
	class StringFunction {
	public:
	const char *array;
	int *indexArray;
	int indexCount;
	StringFunction(const char* initString): array(initString),
	indexArray(new int[strlen(initString)]) {
	}
	void printString(const char *str) {
	for (size_t i = 0; i < strlen(str); i++) {
	std::cout << str[i];
	}
	std::cout << std::endl;
	}
	int countString(const char *subStr) {
	int mainStrLen = strlen(array);
	int subStrLen = strlen(subStr);
	int count = 0;
	int subStrIndex = 0;
	for (int i = 0; i<mainStrLen; i++) {
	if (array[i] == subStr[subStrIndex]) {
	subStrIndex++;
	if (subStrIndex == subStrLen) {
	indexArray[count] = i - subStrLen + 1;
	count++;
	subStrIndex = 0;
	}
	}
	}
	indexCount = count;
	return count;
	}
	char *replaceString(const char* stringRemoved, const char* stringAdded) {
	countString(stringRemoved);
	int diffLen = strlen(stringAdded) - strlen(stringRemoved);
	int finalLen = strlen(array) + (diffLen) * countString(stringRemoved);
	char *newString = (char *)malloc(sizeof(char)*finalLen);
	int mainIndex = 0;
	int index = 0;
	for (int i = 0; i < finalLen; i++) {
	if (i == (indexArray[index] + (index*diffLen))) {
	for (int j = 0; j < strlen(stringAdded); j++) {
	newString[i + j] = stringAdded[j];
	}
	index++;
	i = i + strlen(stringAdded);
	mainIndex = mainIndex + strlen(stringRemoved);
	}
	newString[i] = array[mainIndex++];
	}
	return newString;
	}
	};
	int main(int argc , char argv[])
	{
	StringFunction strClass("Mary had a little lamb, lamb was little, Mary was little");
	std::cout << strClass.replaceString("little", "huge") << std::endl;
	}

view raw ArrarySubArrayReplacement.cpp hosted with ❤ by GitHub