anyone can help?beginner nd help...

cout<<"Please enter your name:";
cin>>user.name;
int i=0;
char name[i];
while (name[i])
{
if (isalpha(name[i])) cout<<"Valid",name[i];
else cout<< "Invalid name entry",name[i];
i++;
}


i want the user enter only alphabet and not number... wat code should i use? above code not working

What errors are you getting? I can see a few things wrong at the moment.

Also, please use code tags.

That array is of size zero so it wont hold anything because you have 'i' = 0.

You could do something along these lines:

Code:

---


char name[32];
int i = 0;

cin.getline(name, sizeof(name));

while(isalpha(name[i]) && i < sizeof(name)) i++;

if(!isalpha(name[i]) && name[i] != '\n'){
//...invalid
}
else{

}

---

the output become invalid name entry invalid name entry valid no matter wat i typed... wat is code tags?

Regarding code tags, read the sticky on this forum.

The first thing I notice about your code is that you are storing the name inside user.name
I am assuming user is an instance of a class?
You are never iterating through that name. In fact you are not doing anything with that (apart from storing it).

Look at Syscal's code for some ideas.

Quote:

---

Originally Posted by silent

the output become invalid name entry invalid name entry valid no matter wat i typed... wat is code tags?

---

code tags allow for the white space in code to be preserved on the forums instead of being aligned on the left margin. to use them, either click on the "#" icon or type [code ] code goes here[/code] w/o the space in [code ]

it's the difference between:
if (foo)
bar();
else
baz();

and:

Code:

---

if (foo)
    bar();
else
    baz();

---

To improve Syscal's code:

Code:

---

std::string name;
int i = 0;

std::getline(name, cin);

while( isalpha(name[i]) && i < name.length() ) i++;

if(!isalpha(name[i - 1]))
{
    //...invalid
}
else
{
    // Valid
}

---

Certainly not the best way to do it, but it works.
And you cannot, and I stress this, create an dynamic array like so:
char name[i];
Where i is a non-const variable.
Furthermore, you have no business user char arrays for string in C++.