numbers <- c(2, 3, 5, 7, 11, 13, 17)
string <- ""
# seq_along gives the indices 1, 2, ...
for (i in seq_along(numbers)) {
if (i > 1) {
string <- paste0(string, "; ")
}
string <- paste0(string, numbers[i])
# The index lets you change the element
numbers[i] <- numbers[i] * 10
}
cat("string =", string, "\n")
cat("numbers =", numbers, "\n")