julia> using Printf
julia> @printf "pi=%4.2f e=%4.2e" pi exp(1)
pi=3.14 e=2.72e+00
julia> @printf("pi=%4.2f e=%4.2e", pi, exp(1))
pi=3.14 e=2.72e+00
julia> s=@sprintf "pi=%4.2f e=%4.2e" pi exp(1)
"pi=3.14 e=2.72e+00"
julia> s
"pi=3.14 e=2.72e+00"
julia> out=open("output.dat","w")
IOStream(<file output.dat>)
julia> @printf(out,"pi=%4.2f e=%4.2e\n", pi, exp(1))
julia> close(out)
julia> run(`cat output.dat`)
pi=3.14 e=2.72e+00
Process(`cat output.dat`, ProcessExited(0))
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