Question

How to count the frequency of the digits (0 to 9) in a string with C++

Answer 1

#include <iostream>
#include <string>

void countDigits(std::string s) {
    if (s.empty()) {
        printf("String is empry");
        return;
    }
 
    int digit_frequency[10] = { 0 }; 
 
    int i = 0;
    while (s[i] != 0) {
        if (isdigit(s[i])) {
            digit_frequency[s[i] - '0']++;
        }
        i++;
    }
 
    for (int i = 0; i < 10; i++) {
        std::cout << i << ": " << digit_frequency[i] << " times\n";
    }
}

int main()
{
    std::string s = "c23c++4523java23988rust82215";
 
    countDigits(s);
}




/*
run:

0: 0 times
1: 1 times
2: 5 times
3: 3 times
4: 1 times
5: 2 times
6: 0 times
7: 0 times
8: 3 times
9: 1 times

*/

 

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