# No variables declared
**URL:** https://discuss.ampl.com/t/no-variables-declared/629
**Category:** Support
**Tags:** variables
**Created:** [June 30, 2023, 7:40pm UTC](https://discuss.ampl.com/t/no-variables-declared/629 "2023-06-30T19:40:19Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@sta6779](https://discuss.ampl.com/u/sta6779)
#### Post date: [June 30, 2023, 7:40pm UTC](https://discuss.ampl.com/t/no-variables-declared/629/1 "2023-06-30T19:40:19Z")
# define the variables
var wrenches \>=0; #number of wrenches to produce
var pliers \>=0;
# objective function
maximize earnings: 0.13 \* wrenches + 0.10 \* pliers;
# contraints
subject to steel: 1.5 \* wrenches + 1.0 \* pliers;
subject to molding: 1 \* wrenches + 1 \* pliers;
subject to assembly: 0.3 \* wrenches + 0.5 \* pliers;
subject to demand1: wrencehs \<=15000;
subject to demand2: pliers \<=16000;
subject to nonneg1: wrenches\>=0;
subject to nonneg2: pliers\>=0;
The above is my input
I tried this
ampl? model gtc.mod;
ampl: solve;
No variables declared.
ampl:
ANd I get no variables declared
---
### Author:  [@4er](https://discuss.ampl.com/u/4er)
#### Post date: [June 30, 2023, 9:43pm UTC](https://discuss.ampl.com/t/no-variables-declared/629/2 "2023-06-30T21:43:48Z")
I see
```auto
ampl? model gtc.mod;
```
The `ampl?` prompt means that a command had already been started on a previous line, so something had already gone wrong.
To say exactly what went wrong, it would be necessary to see a transcript or screenshot of your whole AMPL session, and also an upload of the file gtc.mod. However, just looking at what you show here, I can see that your variable is misspelled in constraint `demand1`. Also your constraints `steel`, `molding`, and `assembly` need to have a relational operator (`>=` or `<=` or `=`) in them.