arrays

[spazamatic2]

1.Input characters from the user until a '-' character is reached. The input will all be characters, though some characters may not be letters; your program should ignore all non-letter characters input.
2.Count the number of each letter that appear. Your program must treat upper and lower case characters as being the same. i.e. the input "aA-" will count 2 a's rather than 1 'a' and 1 'A'.
3.Use an array to store the letter counts.
4.For each letter of the alphabet, output the percentage of the input (not counting non-letter input) that was that letter.


char letter = 'M';
int position = letter - 'A';


How would I go about trying this? I have never worked with arrays before and am not sure where to get started. My main issue is how to output the percentage of each letter. Thank you!

[btripp]

ok you would make an int array of size 27 and set each position in the array to 0. then you will use a while loop to loop the program until the user enters'-'.

inside the while loop you will have to evaluate what the user entered .... aka is the char an 'a' or a 'b' or 'c' or an 'A' etc. you can use if else statements here or even better i would use a switch statemetnt. but in the swith statemetn or ifs whatever you decide to use you will have to add a number to the respective count. so for example the char entered is an 'a', under the a section you would have something like this

array[1] = array[1] + 1; // postion 1 being that of 'a'

// if it were a 'b'
array[2] = array[2] + 1;

ok so the loop will run this until the user enters the '-' char. but you have been keeping count all along. so for each letter you have to something like this;

the float is used so we get a decimal like .25 etc
if we just divided below it wouldnt be correct due to integer division

cout << "The % of 'A' = " << float(array[1])/27 << endl;
cout << "The % of 'B' = " << float(array[2])/27 << endl;
cout << "The % of 'C' = " << float(array[3])27 << endl;

you should be able to solve the problem now. Hope this helped

[spazamatic2]

Thank you very much!
ok so my program is as follows but it says my letters aren't declared.

char letters;
int letcount;
int total;
float array[27];
do
{
cout << "Please print a series of letters followed by a '-' symbol" << endl;
cin >> letters;
if (letters==a||A)
{
array[1] = array[1] + 1;
}
for (int i = 0; i < letters; i++)
for (int j =0; j < letcount; j++)
array [i][j]= letcount/total;
cout << array << endl;
} while (letters |= -)