Input a string of characters in C++, how to count the number of numbers in it and output it

The following steps can be used to count the number of digits in a string in C: traverse the characters in the string. Use the isdigit() function to check if the current character is a digit. If it is a number, add 1 to the number counter.

How to count the number of numbers in a string in C

To count the number of numbers in a string number, you can use the following steps:

1. Traverse each character in the string

   • Use for A loop or iterator to iterate through the characters in a string one by one.

2. Check whether the current character is a digit

   • Use the isdigit() function to check the current character Whether it is a number.

3. If the current character is a digit, increment the digit counter

   • if isdigit() If the function returns true, the digital counter will be incremented by 1.
4. Repeat steps 2 and 3 until the entire string is traversed

The following is a C code example:

<code class="cpp">#include <iostream>
#include <string>

using namespace std;

int main() {
  string input;
  int numCount = 0;

  cout << "Enter a string: ";
  getline(cin, input);

  for (int i = 0; i < input.length(); i++) {
    if (isdigit(input[i])) {
      numCount++;
    }
  }

  cout << "The number of digits in the string is: " << numCount << endl;

  return 0;
}</code>

This program will prompt the user for a string and then iterate through each character in the string. If a character is a number, it will increment the number counter. Finally, it will print the number of digits in the string.

The above is the detailed content of Input a string of characters in C++, how to count the number of numbers in it and output it. For more information, please follow other related articles on the PHP Chinese website!