How to get input integer from user c

Question

i want to get matrix values, rows and coloumn from user input. So i'm implementing do while to do this: This is only for the rows:

do {
        printf ("Inserisci il numero di righe ( intero-positivo-diverso da 0): ");
        scanf ("%d",&righe);
    } while (righe<=0);

I want to check that user insert only integers. what can i do?

Flexo - Save the data dump · Accepted Answer · 2012-03-02 17:11:24Z

2

scanf returns an integer indicating how many "things" it successfully read. You can test this in a conditional to see if it got what you were looking for. Example:

const int result = scanf ("%d",&righe);
if (1 != result) {
  /* didn't get the 1 input we were looking for, do something about it! */
}

You'll want to distinguish between EOF and simply not an integer though.

answered Mar 2, 2012 at 17:11

Flexo - Save the data dump♦

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stacker · Accepted Answer · 2012-03-02 17:10:49Z

1

Check the return value of scanf() it should return the number of converted strings, if it is != 1 the input couldn't be converted to an integer.

Reference :scanf

answered Mar 2, 2012 at 17:10

stacker

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Anton Giertli · Accepted Answer · 2012-03-02 17:11:53Z

0

You are looking for this ctype.h

answered Mar 2, 2012 at 17:11

Anton Giertli

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Jayyrus · Accepted Answer · 2012-03-06 23:49:48Z

0

your code is correct. is the right way to do what you want...

answered Mar 6, 2012 at 23:49

Jayyrus

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