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  1. //Maxwell Brewer                 CS1A                     Chapter 10, p. 588, #1
  2. //
  3. /*******************************************************************************
  4.  * COUNT ARRAY CHARACTERS
  5.  * _____________________________________________________________________________
  6.  * This program will take a string and output the number
  7.  * of characters contained in the string array.
  8.  * 
  9.  * INPUT:
  10.  *   input_string        : user input of characters
  11.  * 
  12.  * OUTPUT:
  13.  *   charCount           : array of string characters
  14.  * 
  15.  ******************************************************************************/
  16.  
  17. #include <iostream>
  18. using namespace std;
  19.  
  20. // Function prototype
  21. int charCount(char*);
  22.  
  23. int main() {
  24.  
  25.     // Declare char array for the C-string, size 21
  26.     //(20 characters + null terminator)
  27.     char input_string[21];
  28.  
  29.     // Prompt user to enter input
  30.     cout << "Enter a string with a maximum of 20 characters:\n";
  31.     cout << "I will output the number of characters it has!\n";
  32.  
  33.     // Read input up to 20 characters
  34.     cin.getline(input_string, 21);          // not using cin >>
  35.                                             // since it stops at
  36.                                             // whitespace
  37.  
  38.     // Call function and display the result
  39.     cout << "The string you entered has " 
  40.          << charCount(input_string)
  41.          << " characters.\n";
  42.  
  43.     return 0;  // Return 0 to indicate successful program termination
  44. }
  45.  
  46. // Function to count the number of characters in a C-string
  47. int charCount(char* ptr) {
  48.     int i = 0;          // Initialize character count
  49.  
  50.     // Loop through each character in the string until
  51.     // null terminator is reached
  52.     while (*ptr != '\0'){
  53.  
  54.         i++;        // Increment the counter
  55.         ptr++;      // Move to the next character
  56.  
  57.     }
  58.  
  59.     return i;  // Return the character count
  60. }
Success #stdin #stdout 0s 5288KB
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Enter a string with a maximum of 20 characters:
I will output the number of characters it has!
The string you entered has 14 characters.
https://ideone.com/GhHdGO
Chapter 10, p. 588, #1
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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