How can I write a function that returns true only is the character is lowercase

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how i can write a function that return true only if the charactar is lowercase charactar
,i can't use if statement

What I have tried:

C

bool lowecase(char c)
if(c>='a'&&c<='z')
   return true;
else
   return false;

Posted 28-Apr-16 11:33am

lia7

Updated 29-Apr-16 4:07am

PIEBALDconsult

v2

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jeron1 · Answer 1 · 2016-04-28T12:11:00

Solution 1

How about using the islower()[^] method.

Posted 28-Apr-16 12:11pm

jeron1

Comments

[no name] 28-Apr-16 18:23pm

i don't know this method

[no name] 28-Apr-16 18:25pm

if i write..
bool isLower(char c) {
return (c >= 'a') && (c <= 'z');
}
is this true at all ?

nv3 28-Apr-16 18:40pm

As this is obviously homework I will not provide you the answer. Just a hint:

(c >= 'a') && (c <= 'z')

is an expression. Now, what data type has this expression? And then you know, which values it might assume. If you return this value, does it do what you want?

If you answer those questions you will find your solution.

[no name] 28-Apr-16 18:53pm

mmm so is it enough to type:
return (c >= 'a') && (c <= 'z');

[no name] 28-Apr-16 18:54pm

i don't think i fully understood what you wrote :/

nv3 28-Apr-16 19:06pm

(c >= 'a') && (c <= 'z')

Is an expression. What data type has this expression? Here are some examples:

1 + 3 * 5 -- this is an int expression
1 + 3.1 * 5.1 -- this is an expression of type double

bool a, b;
a && b -- this is an expression of type bool

Now take your C textbook and find out what data type (c >= 'a') is. The operator is >=. That should give you a clue.

When you know what type (c >= 'a') is you should be able to answer what type

(c >= 'a') && (c <= 'z')

is.

[no name] 28-Apr-16 19:09pm

thank you for you're help !

nv3 28-Apr-16 19:14pm

You'r welcome. And a final hint: Just try your suggested code out. Write a couple of tests in you main function and see whether your lowercase function returns what you expect.

Richard MacCutchan 29-Apr-16 11:08am

Why don't you try it and see what results you get?