Simply enter the variable name or expression at the command prompt, R will print its value. Use the print function for generic printing of any object. Use the cat function for producing custom formatted output. Here is the demonstration.
Another way to print pi using Print function as shown below
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This is useful because you can always view your data: just print it. You needn’t write special printing logic, even for complicated data structures.
The print function has a significant limitation, however: it prints only one object at a time. Trying to print multiple items gives this mind-numbing error message:
print("The zero occurs at", pi, "radians.")
The cat function is an alternative to print that lets you combine multiple items into a continuous output:
cat("The zero occurs at", 2*pi, "radians.", "\n")
Using cat gives you more control over your output, which makes it especially useful in R scripts. A serious limitation, however, is that it cannot print compound data structures such as matrices and lists.