confusion in strlen behaviour

Question

Please follow this link..I have commented my doubts in the program

https://onlinegdb.com/r12zfCruL

using character array & providing input as "kjlp" where I expect the output of strlen of array to be 4; but in some cases it is different which outputs 6. Why so??

Answer 1

So, what you did is you misused cin.get(). You tried to ser a[0] = cin.get(), but the proper way is to actually do it how I did in the link https://onlinegdb.com/SyJ-8ecOL.

Comments

Thank you very much, now I understood the code that you've written and the right way of using it.

please clarify this too.
a[0] = cin.get() //this can be used to read single character right....is there any other disadvantages of using cin.get() like this.

and what is the actual reason for that behavior in my code??
is it something related to compiler or with memory, the way how it is stored or what exactly happened over there?

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So, cin.get(string name, size) is a way to get the user input with whitespace. Basically an entire word or phrase instead of just a single string. If you want to read a character from an array or string, you simple do std::cout<<a[i]; where i is the index number of the character you want to read.

The issue in your code lies in a misunderstanding of syntax. cin.get() is to put user input into the string you define in its arguments, not to read a specific letter. If you look back at the code, I simply do

cin.get(a, 80)

which tells the program to get the user input, and put it into the array a, with a maximum size of 80. There are no extra steps to add.

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u can simply store strlen in a variable and after users input u should cout variable to get length of desired array.

char arr[10];
int length=strlen(arr,10);
cout <<"lenght is: "<<length<<endl;