Printf · The Julia Language

# Printf

`Printf.@printf` — Macro

    @printf([io::IO], "%Fmt", args...)

Print `args` using C `printf` style format specification string. Optionally, an `IO` may be passed as the first argument to redirect output.

Examples

    julia> @printf "Hello %s" "world"
    Hello world

    julia> @printf "Scientific notation %e" 1.234
    Scientific notation 1.234000e+00

    julia> @printf "Scientific notation three digits %.3e" 1.23456
    Scientific notation three digits 1.235e+00

    julia> @printf "Decimal two digits %.2f" 1.23456
    Decimal two digits 1.23

    julia> @printf "Padded to length 5 %5i" 123
    Padded to length 5   123

    julia> @printf "Padded with zeros to length 6 %06i" 123
    Padded with zeros to length 6 000123

    julia> @printf "Use shorter of decimal or scientific %g %g" 1.23 12300000.0
    Use shorter of decimal or scientific 1.23 1.23e+07

For a systematic specification of the format, see here. See also `@sprintf`.

Caveats

`Inf` and `NaN` are printed consistently as `Inf` and `NaN` for flags `%a`, `%A`, `%e`, `%E`, `%f`, `%F`, `%g`, and `%G`. Furthermore, if a floating point number is equally close to the numeric values of two possible output strings, the output string further away from zero is chosen.

Examples

    julia> @printf("%f %F %f %F", Inf, Inf, NaN, NaN)
    Inf Inf NaN NaN

    julia> @printf "%.0f %.1f %f" 0.5 0.025 -0.0078125
    0 0.0 -0.007812

source
`Printf.@sprintf` — Macro

    @sprintf("%Fmt", args...)

Return `@printf` formatted output as string.

Examples

    julia> @sprintf "this is a %s %15.1f" "test" 34.567
    "this is a test            34.6"

source

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This document was generated with Documenter.jl version 0.27.10 on Wednesday 18 May 2022. Using Julia version 1.7.3.