Question

I have a problem with count number of back slash \ in C++, I have this code:

string path = "a\b\c";
int level = 0;
int path_length = path.size();
for(int i = 0; i < path_length; i++){
if(path.at(i) == '\\'){
        level++;
    }
}
cout << level << endl;

However, the level is always 0! Can you explain why? And how to count the number of /?

Answer 1

Backslashes in your variable should be escaped.

string path = "a\\b\\c";

Also you can use count function in algorithms library to avoid looping each character in the string and check whether it is backslash.

#include <iostream>
#include <string>
#include <algorithm>   // for count()
using namespace std;

int main()
{
string path = "a\\b\\c";
int no_of_backslash = (int)count(path.begin(), path.end(), '\\');
cout << "no of backslash " << no_of_backslash << endl;
}