Comparing Strings in C++ so they output from the smallest word to the largest.

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Hi,

I'm trying to write a program that can compare strings inputted by the user and then output them in the order of their size from smallest to largest (example: Biggest, bigger, big, is outputted as big, bigger, Biggest regardless of the order of the word.). I was able to compare numbers inputted by the user using <= and && operators, but these operators don't seem to help me for comparing strings. I'm working from Exercise 7 on Pg. 85 of Programming: Principles and Practice using C++ by Bjarne Stroustrup. I haven't found anything on google easily describing what I'm trying to do. I have not been introduced to arrays, vectors, or pointers at this point in the text. Although I have been introduced to variables, if-statements, and basic operators.

Thank you

Posted 26-Jul-13 4:14am

UniversalMutt

Updated 26-Jul-13 4:15am

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max_nowak 26-Jul-13 10:29am

Do you mean by 'their size' their length? If so, you can use strlen() (or std::string::length if you use stl) to determine the length of the string, which in turn you can leverage to compare them.

2 solutions

Solution 2

If you have not been introduced to arrays and vectors, then I suggest you look into that before continuing. ( and maybe std::string )

I Assume you know how to get the length of a a string ? (std::string::size() or std::string::length() )

Once you have the length or the strings, then you can sort the string according to their size.

for example, you can put the strings in a std::vector and use std::sort to sort the vector.

C++

std::vector<std::string xmlns:std="#unknown"> vectorOfString; // filled with strings.
...

// you need to defined the SortCondition predicate to compare the string lengths... 
// left as an exercises)
std::sort(vectorOfString.begin(), vectorOfString.end(), SortCondition );
</std::string>

Posted 26-Jul-13 4:32am

Maximilien

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Pascal-78 · Accepted Answer · 2013-07-26T04:24:00

You have to compare the length of the strings not the string itself.

if you use std::string to store one of your string, you can use the length method:

C++

std::string mystring;
int mystring_length = mystring.length();

if you use an array of char to store the strings, you can use a function to get the length:

C++

int mystringlength=strlen(mystring);

or basically found the number of char before the end character ('\0')

I hope this will help you to find the solution of your exercise.