Converting strings into alternate Caps in C#

Lewis Cao

convertToAltCaps("hello") returns "hElLo" convertToAltCaps

("section is awesome") returns "sEcTiOn Is AwEsOmE"

my program does not work when enter more than 4 letters

Pls Help Me

using System;

using System.Collections.Generic;

using System.Linq; using System.Text;

using System.Threading.Tasks;

namespace AltCap {

class Program {

static void Main(string[] args) {

Console.WriteLine("Enter Your String: ");

string s = Console.ReadLine();

StringBuilder b = new StringBuilder(s);

for(int i = 1; i<b.Length;i+=2) {

char c = Char.ToUpper(b[i]);

b.Replace(b[i], c); }

Console.WriteLine(b);

Console.ReadKey(); } }

6 Replies

Know the answer? Post it — somebody with the same question will find it here.

Bhupinder Rajput11y ago
var tt = "helloworld";
string ff = string.Empty;
for (int i = 0; i < tt.Length; i++)
{
if (i % 2 == 0)
{
ff = ff + tt[i].ToString().ToUpper();
}
else
{
ff = ff + tt[i].ToString().ToLower();
}
}
var result = ff;
Mukesh Nayak12y ago
Yeah completely agree, if the requirement is get all the letters alternatively capital in a string. But if the requirement is to have all the words in a string alternatively capital than my suggestion works there.
Vulpes12y ago
Judging by Lewis's second example, it is affected though by spaces within the string which are ignored when deciding whether the next letter should be capitalized or not:

sEcTiOn Is AwEsOmE

rather than

sEcTiOn iS AwEsOmE
Mukesh Nayak12y ago
I think there is a problem in the line

b.Replace(b[i], c)

you are trying to use replace with string builder and in turn it is doing a replace to all the characters in a particular string. We have replace the character considering the position of that character. We can replace that particular line by

b[i] = c;
or
b.Replace(b[i], c, i, 1);

which will get us the required result. And i don't think it has to do anything with number of words in the string.

Hope this will help,
Vulpes12y ago
It's a bit more complicated than it seems.

Try this:

using System;
using System.Collections.Generic;
using System.Linq; using System.Text;
using System.Threading.Tasks;

namespace AltCap
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Enter Your String: ");
string s = Console.ReadLine();
StringBuilder b = new StringBuilder(s);
bool changeNext = false;

for(int i = 0; i
{
if(Char.IsLetter(b[i])) // ignore non-letters
{
if(changeNext)
{
b[i] = Char.ToUpper(b[i]);
}

changeNext = !changeNext;
}
}

Console.WriteLine(b);
Console.ReadKey();
}
}
}
Lakshmanan Sethu Sankaranarayan12y ago
your second input seems to be working. whats ur issue?