plzzzz help in this validations

I have 2 questions ro solve but I donno how to go about them. I would really appreciate if anyone cam help in any of them!!

First, how can I validate for non numeric value entered by the user using while loop? for example, if the user enter non numeric value, I should stop the while loop?

Second, how can I count the number of spaces , the number of new lines , and the number of all other characters entered by the user??


Finnaly, how can I replace each period with an exclamation mark in a string entered by the user and print it?


plzzzzzzzzzzzz help!!!!

Quote:

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Originally Posted by moza

I have 2 questions ro solve but I donno how to go about them. I would really appreciate if anyone cam help in any of them!!

First, how can I validate for non numeric value entered by the user using while loop? for example, if the user enter non numeric value, I should stop the while loop?

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#1: Test the status of the stream after the extraction operation:

Code:

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int value;
cout << "Enter in a bunch of integers: ";
while( cin >> value )
    cout << "You entered: " << value << endl;

cin.clear();  // Clear streams error state
string data;
getline(cin,data);

cout << data << " is not an integer." << endl;

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Possible I/O:

Code:

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Enter in a bunch of integers: 102 35 16
You entered: 102
You entered: 35
You entered: 16
56 17
You entered: 56
You entered: 17
18
You entered: 18
20blah
You entered: 20
blah is not an integer.

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Quote:

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Originally Posted by moza

Second, how can I count the number of spaces , the number of new lines , and the number of all other characters entered by the user??

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Easiest way: Read character-by-character and insert them into a map<char,int> container or update the value stored there.

Quote:

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Originally Posted by moza

Finnaly, how can I replace each period with an exclamation mark in a string entered by the user and print it?

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That's 3 questions, not 2...

There is a handy dandy replace function in the <algorithm> header or the string container itself has a replace member function... learn how to use them.

Code:

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                while(inputIsInvalid)
                        {
                                cout << endl << "Enter Input > " ;
                                cin >> input;
                                length = strlen(input);//sets length to number of charcters in input
                                if(length > 1)
                                {
                                        cout << "input is invalid" << endl;
                                }
                                else if(!isdigit(input[0]))//checks to see if input is a digit
                                {
                                        cout << "input is invalid" << endl;
                                }
                                else
                                {
                                        i = atoi(input);//converts input into int
                                        inputIsInvalid = false;
                                }
                        }

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thank all of you for the useful reply, ok, I've solved the first problem.

Could you please explain more solution 2 ? I would really appreciate it!!

I will search for the replace function and learn it! thanks for the hint!!