Declaring a variable inside a for loop; getting error with c2000 compiler

Question

I am working on a C project for a TI TMS320x DSP with the C2000 compiler. I tried to initialized a loop variable directly inside a for loop, but somehow I get a compiler error:

Code:

for (int TabCnt = 0; TabCnt < 10; TabCnt++)
{
    x++;
}

Error:

error #20: identifier "TabCnt" is undefined

I figure this might be a wrong compiler setting? If I declare the variable outside of the loop, it works perfectly.

You need to enforce c99 mode in the compiler setting.

Sourav Ghosh
– Sourav Ghosh

2015-03-24 08:58:48 +00:00
Commented Mar 24, 2015 at 8:58 — Sourav Ghosh
– Sourav Ghosh, Commented Mar 24, 2015 at 8:58
Possible duplicate of C: for loop int initial declaration

Evan Carroll
– Evan Carroll

2018-07-24 19:23:07 +00:00
Commented Jul 24, 2018 at 19:23 — Evan Carroll
– Evan Carroll, Commented Jul 24, 2018 at 19:23

Supr · Accepted Answer · 2019-01-09 09:16:23Z

4

That's because you are using a compiler that supports only C89.

This syntax:

for (int TabCnt = 0; TabCnt < 10; TabCnt++)

is only valid since C99. The solution is either enable C99 if supported, or declare variables in the beginning of a block, e.g:

void foo()
{
    int x = 0;
    int TabCnt;
    for (TabCnt = 0; TabCnt < 10; TabCnt++)
    {
        x++;
    }
}

edited Jan 9, 2019 at 9:16

Supr

19.1k3 gold badges33 silver badges37 bronze badges

answered Mar 24, 2015 at 8:59

Yu Hao

123k50 gold badges252 silver badges305 bronze badges

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

1 Comment

Simon Over a year ago

Ok, I thought it might be something like that. Thanks!

Gopi · Accepted Answer · 2015-03-24 09:01:15Z

0

int TabCnt;

for(TabCnt = 0; TabCnt < 10; TabCnt++)

will solve your problem as it seems your compiler doesn't support C99.

Try compiling with -std=c99 since the syntax you have is allowed only from C99

answered Mar 24, 2015 at 9:01

Gopi

19.9k4 gold badges28 silver badges37 bronze badges

Comments

karstarkastro · Accepted Answer · 2023-08-08 07:43:51Z

0

For anyone looking how to enable c99 in Code Composer Studio (the editor used to develop embedded C for Texas Instruments microcontrollers), go to Project -> Properties and then in the left hand side go to Build -> C2000 compiler -> Advanced Options -> Language options. You can select c99 in the drop-down menu of the "C Dialect" parameter.

Note: I am using CCS v11.2.0.00007

answered Aug 8, 2023 at 7:43

karstarkastro

115 bronze badges

Collectives™ on Stack Overflow

Declaring a variable inside a for loop; getting error with c2000 compiler

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related