C++ How to capitalize first word of each sentence/line in a string?

Question

I am loosing my hair right now. I have a string, which i manipulate to start a new line/sentence after a punctuation, but I cant understand how I can capitalize the first word of each sentence? Except for this, i can not get out of the loop to change the dot into a dot and new line.

int main()
{
    string const txt1 = "Candy is good for your health.";
    string const text2 = "All kids should buy candy.";
    string const text3 = "Candy nowadays is a hit among kids.";
    string const text4 = "Every meal should include candy.";


    string text = text1 + text2 + text3 + text4;

    transform(text.begin(), text.end(), text.begin(), ::tolower);

    while (text.find("candy") != string::npos)
        text.replace(text.find("candy"), 3, "fruit");
    string_replace_all(text, ".", ".\n");

This is what i have added so far:

string line, total = ""; istringstream stream(text);
while (getline(stream, line, '\n'))
{
    if (line.size() > 0)
        total += (char)toupper(line[0]) + line.substr(1) + "\n";
    else total += "\n";
}

It got deleted before i tried @JakeFreeman. I will try it now. — Thesar, Dec 03 '17 at 23:52
Also make sure you put `\n` characters between your strings. — Jake Freeman, Dec 03 '17 at 23:53
What library does getline belong to? Cant get it to work. Errors: E0349 no operator "+" matches these operands E0304 no instance of overloaded function "getline" matches the argument list E0070 incomplete type is not allowed (stream) @JakeFreeman — Thesar, Dec 03 '17 at 23:58
@JakeFreeman i have it, and also using std::getline; Won't recognize it. — Thesar, Dec 04 '17 at 00:01
Ohh, now they work after I included sstream. But it wont accept '+' as a operator in | toupper(line[0]) + line.substr(1) + "\n"; | @JakeFreeman — Thesar, Dec 04 '17 at 00:03
@Thesar I edited my post to fix that by adding `to_string(toupper(line[0])`. — Jake Freeman, Dec 04 '17 at 00:05
@JakeFreeman Now i can compile it, but nothing happens. No capitalization is done :/. — Thesar, Dec 04 '17 at 00:08
I have this: string_replace_all(text, ".", ".\n"); | to insert \n after each dot. @JakeFreeman, but i will try this manually — Thesar, Dec 04 '17 at 00:12
@JakeFreeman did add "\n" between each string, didnt help :/ — Thesar, Dec 04 '17 at 00:14
@Thesar I just tested a slight modification and it works. instead of to_string() just cast to char — Jake Freeman, Dec 04 '17 at 00:41
@JakeFreeman thank you for your time. Really appreciate it. Didn't work with (char) neither. Please check my question, i have added your pile of the code, and see if I am doing something wrong. — Thesar, Dec 04 '17 at 00:46
@JakeFreeman then I am doing something else wrong, don't know what tho. I want to thank you for your help. — Thesar, Dec 04 '17 at 00:51
@Thesar thanks I'll still be happy help if you figure what is wrong — Jake Freeman, Dec 04 '17 at 00:52
@JakeFreeman can it be because i convert all chars to lowecase, and it loops this transform all the time? — Thesar, Dec 04 '17 at 00:56
@Thesar the only difference between my tests and your code is string_replace_all is that a custom function. — Jake Freeman, Dec 04 '17 at 01:16
@JakeFreeman yes, it's the only function that is allowing me to replace "." with ".\n" without getting stuck in a while loop that searches for "." to replace it, and allways finds one. | while (text.find(".") != string::npos) | | text.insert(t1.find("."), ".\n"); | makes my program go all black because i get stuck in the loop due to the fact that find always finds a "." — Thesar, Dec 04 '17 at 01:19
@JakeFreeman if you mean the string_replace_all: it is a std, with a void declaration — Thesar, Dec 04 '17 at 01:28
@Thesar I could not find that function, everything except that is the same so make sure its correct. — Jake Freeman, Dec 04 '17 at 01:36
@JakeFreeman while ((pos = alltxt.find(".", pos)) != std::string::npos) { alltxt.replace(pos, 1, ".\n"); pos += 2; } |||| What to add after pos+=2; to capitalize the character after that position? I think this might solve my issue — Thesar, Dec 04 '17 at 21:33
@JakeFreeman Am Idoing it right, to find the first character after pos=+2? ||| alltxt.find_first_of(' '); toupper(' '); alltxt.replace(pos, 1, ".\n"); pos += 2; // move past the dot (and the extra '\n' alltxt.find_first_of(' '); toupper(' '); ||| — Thesar, Dec 04 '17 at 21:47

Jake Freeman · Accepted Answer · 2017-12-04T00:41:58.020

1

A very simply way to this would be:

string line, total = ""; istringstream stream(someString);
while(getline(stream, line, '\n')) 
{
    if(line.size() > 0) 
        total += (char)toupper(line[0]) + line.substr(1) + "\n";
    else total+= "\n";
}

Hope this helps.

edited Dec 04 '17 at 00:41

answered Dec 03 '17 at 23:36

Jake Freeman

1,700
1
8
15

C++ How to capitalize first word of each sentence/line in a string?

1 Answers1