how to extract and assign value from a print output in R

#Suppose

d=c(1,2,3)

#create a for loop

for (i in 1:3) print(d[i])

produces
[1] 1
[1] 2
[1] 3

How can I assign c1=1, c2=2, c3=3?

I have tried for(i in 1:3) c[i]=d[i] but it don't work :(