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Code should be placed in three backticks as shown below

# Differential expression test- code1
et <- exactTest(yf)
topTags(et)
summary(de <- decideTestsDGE(et, adjust.method="BH", p=.05))


##other
fitq <- glmQLFit(yf,design)
qlf <- glmQLFTest(fitq,coef=2)
summary(decideTests(qlf))

This isn't actually answering your question, but in brief: let's assume that you are using edgeR to analyze count based data (like some flavor of RNA-seq), and that all of the upstream code is correct between the two examples you present, these days you should almost certainly prefer to use the QLF framework.

Here's a post I found from Aaron Lun that speaks about to the rationale for that, which is a more direct answer to your question.

The first method is the "classic" edgeR whereas the second is the newer quasi-likelihood approach. Assuming that you've applied both methods in the right way, then both methods are correct and will give similar results. However we recommend the quasi approach because it gives more rigorous error rate control. The difference between the two is explained in the edgeR User's Guide.

BTW, decideTestsDGE and decideTests are the same function. The first is retained in edgeR only to avoid breaking legacy code.