How to combine values of Variables into a string in C

Question

Is there a way to combine three or more variables with values in "int" into a string. Say i want to combine the values of a,b,c in a single string, and then further prints those values using their variables from the string.

It is not very clear what you want in the second part of the question. Please give some simple example. — Ivaylo Strandjev
– Ivaylo Strandjev, Commented Sep 26, 2013 at 15:03

wholerabbit · Accepted Answer · 2013-09-26 15:13:57Z

8

To put three ints into a string:

   int numbers[3] = { 1, 2, 3 };
   char string[1024];
   sprintf(string, "%d %d %d", numbers[0], numbers[1], numbers[2]);

The string can then be printed using normal means. sprintf() is a version of printf() that prints into a char* just as fprintf() prints to a FILE*.

As Jonathan Leffler observes, a pitfall of sprintf() is that you can overflow your char buffer. For this reason there is an snprintf() which allows you to specify a maximum length for the input:

    snprintf(string, 1024, "%d %d %d", numbers[0], numbers[1], numbers[2]);

edited Sep 26, 2013 at 15:13

answered Sep 26, 2013 at 15:08

wholerabbit

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4 Comments

Alan Over a year ago

For further information consult the sprintf page at cplusplus.com.

Jonathan Leffler Over a year ago

Given the size of string, you have more than enough space to spare, but in general, using snprintf() rather than sprintf() is a good idea.

Joe Over a year ago

I was going to say, you'd have to have quite a lot of ULLONG_MAXes, but best use snprintf as examples to people who are new to C.

Joe Over a year ago

50 values of 18446744073709551615 would cause problems

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