pointers and data references

I have stored in a variable called var the name of a field. var = noms-n1. I want to assign something in noms-n1 which is the var I use.

var can have different values like noms-n2,noms-n3 etc.. The assignment done should be dinamic.

The table I use is noms which is composed by n1,n2,n3 etc..