Question

How to find the index of Nth occurrence of a character in a string with C++

Answer 1

#include <string>
#include <iostream>

int GetNthIndexOfCh(const std::string &s, char ch, int n) {
	int count = 0;

	for (int i = 0; i <= s.length() - 1; i++) {
		if (s[i] == ch) {
			count += 1;
			if (count == n) {
				return i;
			}
		}
	}

	return -1;
}

int main()
{
	std::string str = "java c++ python c# javascript";

	std::cout << GetNthIndexOfCh(str, 'a', 3) << std::endl;
}




/*
run:
     
20
     
*/

 

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