Question

use C++

1. Write a program to calculate the frequency of every letter in an input string s.
   1. Your program should be able to input a string.
   2. Calculate the frequency of each element in the string and store the results
   3. Your program should be able to print each letter and its respective frequency.
   4. Identify the letter with the highest frequency in your message.
   5. Your message should be constructed from at least 50 letters.

Example of Output:

letters	frequency
a	10
b	4
c	6
v	12
s	20
z	1
r	3

Letter s has the highest frequency of 20.

Answer 1

Code is

#include <iostream>
#include <string>
using namespace std;
int main()
{
string s;
int i, len;
// declare a array to store frequency of each character
int freq[26];

/* Input string from user */
cout<<"Enter any string: (atleast 50 characters)";
getline(cin,s);

len = s.size();
/* Initialize frequency of each character to 0 */
for(i=0; i<26; i++)
{
freq[i] = 0;
}
/* Find total number of occurrences of each character */
for(i=0; i<len; i++)
{
/* If the current character is lowercase alphabet */
if(s[i]>='a' && s[i]<='z')
{
freq[(int)s[i] - 97]++;
}
// else upper case
else if(s[i]>='A' && s[i]<='Z')
{
freq[(int)s[i] - 65]++;
}
}
// To get max frequent letter use a loop
int max=freq[0],maxposition;
for(int i=1;i<26;i++)
{
if(freq[i]>max)
{
max = freq[i];
maxposition=i;
}
}
/* Print the frequency of all characters in the string */
cout<<"\nFrequency of all characters in the given string: \n";
cout<<"Letter \t frequency\n";
for(i=0; i<26; i++)
{
/* If current character exists in given string */
if(freq[i] != 0)
{
cout<<(char)(i + 97)<<" \t"<< freq[i]<<endl;
}
}
cout<<"Letter "<<(char)(maxposition+97)<<" has the highest frequency of "<<max;
return 0;
}
Code Screen Shot

Output

This is how you can write a program in C++ to get frequency of each characters in string s

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