Count and Print the alphabets having ASCII value in the range [l, r] in C++

We are given with a string of any length and the task is to calculate the count and print the alphabets in a string having ASCII value in the range [l,r]

ASCII value for character A-Z are given below

ASCII value for characters a-z are given below −

For Example

Input − String str = “point       First = 111, Last = 117 Output − characters in the given range are: p, o , t       Count is: 3

Explanation − since p, o and t lies in the range of [111, 117] these characters will be counted.

Input − String str = “ABCZXY       First = 65, Last = 70 Output − characters in the given range are: A, B, C       Count is: 3

Explanation − since A, B and C lies in the range of [65, 70] these characters will be counted.

Approach used in the below program is as follows

• Input the string, start and end values to create the range and store it in variables let’s say, str.

• Calculate the length of the string using the length() function that will return an integer value as per the number of letters in the string including the spaces.

• Take a temporary variable that will store the count of characters

• Start the loop from i to 0 till i is less than the length of the string

• Inside the loop, check if start is less than equals to str[i] and str[i] is less than equals to end

• Now, increase the count by 1 if condition holds true and print str[i]

• Return the count

• Print the result

Example

 Live Demo

#include <iostream> using namespace std; // Function to count the number of // characters whose ascii value is in range [l, r] int count_char(string str, int left, int right){    // Initializing the count to 0    int count = 0;    int len = str.length();    for (int i = 0; i < len; i++) {       // Increment the count       // if the value is less       if (left <= str[i] and str[i] <= right) {          count++;          cout << str[i] << " ";       }    }    // return the count    return count; } int main(){    string str = "tutorialspoint";    int left = 102, right = 111;    cout << "Characters in the given range";    cout << "\nand their count is " << count_char(str, left, right);    return 0; }

Output

If we run the above code it will generate the following output −

Characters in the given range and their count is o i l o i n 6