lists occurrences of characters in the string c++

To count the occurrences of characters in a string in C++, you can follow these steps:

1. Declare a string variable to hold the input string.
2. Declare a map container to store the characters as keys and their occurrences as values.
3. Iterate through each character in the string.
4. For each character, check if it already exists in the map.
5. If it does, increment the value (occurrence) by 1.
6. If it doesn't, add the character to the map with an initial occurrence of 1.
7. After iterating through all the characters, you will have a map that stores each character and its corresponding occurrence.
8. You can then iterate through the map to output the characters and their occurrences.

Here is an example code snippet that demonstrates the above steps:

#include <iostream>
#include <map>

int main() {
    std::string inputString = "c++";
    std::map<char, int> characterOccurrences;

    for (char c : inputString) {
        if (characterOccurrences.count(c) > 0) {
            characterOccurrences[c]++;
        } else {
            characterOccurrences[c] = 1;
        }
    }

    for (const auto& pair : characterOccurrences) {
        std::cout << pair.first << ": " << pair.second << std::endl;
    }

    return 0;
}

This code snippet counts the occurrences of characters in the string "c++" and outputs the results. In this case, the output would be:

c: 1
+: 2

Please note that this code snippet assumes that you have the necessary standard library headers included and that you are using a C++ compiler that supports C++11 or later.