Using scanf to read an integer or a string

Question

How can I use scanf to read either an int or a string?

What I'm trying to do is:

printf("Enter Your Guess, 0 - 100: "); /* Input your guess */

scanf("%as", &pass);

printf("%s", pass);

In this program the player can either chose to enter a number or pass how can I scan either the number or the word pass. Is there and if statement I can put in or something I've been going into this for like 1 hour

Use a fgets followed by combination of strcmp and strtoul. — Kerrek SB
– Kerrek SB, Commented Apr 3, 2013 at 21:53

Sam I am says Reinstate Monica · Accepted Answer · 2013-04-03 21:53:43Z

2

scan in a string, and determine whether it is made entirely of legal symbols for a number or whether the string says "pass", and if it is a number, than you can convert it to the type of your choice.

answered Apr 3, 2013 at 21:53

Sam I am says Reinstate Monica

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Comments

pAndrei · Accepted Answer · 2013-04-03 21:53:47Z

0

Well, a workaround would be to simply read a string all the time and use atoi or snprintf to convert the desired string to a number if it contains no other characters except [0-9]

answered Apr 3, 2013 at 21:53

pAndrei

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1 Comment

Jonathan Leffler Over a year ago

Using snprintf() won't convert a string to an integer; presumably, you meant sscanf(). Using strtol() or strtod() or one of their relatives would probably be a good choice — though they are subtle functions which require care to be used properly.

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