read integer from character array

Question

I have a string, whith five integers, separated by spaces. For example: 12 33 45 0 1

I have five variables, where I would like to load these numbers. Is it possible to call atoi more times? Or how is it even possible?

char c[] = "12 33 45 0 1";
int a1, a2, a3, a4, a5;

You probably need to learn one other concept called array. — P.P
– P.P, Commented Mar 25, 2014 at 23:10

Benesh · Accepted Answer · 2014-04-25 12:35:29Z

5

Use strtok to split the string into tokens, and use atoi on each one of them.

A simple example:

    char c[] = "1 2 3";         /* our input */
    char delim[] = " ";         /* the delimiters array */
    char *s1,*s2,*s3;           /* temporary strings */
    int a1, a2, a3;             /* output */

    s1=strtok(c,delim);         /* first call to strtok - pass the original string */
    a1=atoi(s1);                /* atoi - converts a string to an int */

    s2=strtok(NULL,delim);      /* for the next calls, pass NULL instead */
    a2=atoi(s2);

    s3=strtok(NULL,delim);
    a3=atoi(s3);

The tricky thing about strtok is that we pass the original string for the first token, and NULL for the other tokens.

edited Apr 25, 2014 at 12:35

answered Mar 25, 2014 at 23:08

Benesh

3,4281 gold badge20 silver badges38 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Jan Vlcinsky Over a year ago

Would you dare to put here sample piece of code doing it? Otherwise your answer seems too short and would fit better into comment rather then as complete answer.

user3386109 · Accepted Answer · 2014-03-25 23:14:14Z

1

You can also use sscanf to convert the numbers, but be sure to check the return value

if ( sscanf( c, "%d%d%d%d%d", &a1, &a2, &a3, &a4, &a5 ) != 5 )
    printf( "Well, that didn't work\n" );

answered Mar 25, 2014 at 23:14

user3386109

35k7 gold badges52 silver badges69 bronze badges

Collectives™ on Stack Overflow

read integer from character array

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related