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

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

Examples

1. Print formatted output to the standard output:

   julia> @printf("Hello, %s!", "Julia")
   Hello, Julia!

   This example prints the formatted string "Hello, Julia!" to the standard output.

2. Print formatted output to a file:

   julia> file = open("output.txt", "w");
   julia> @printf(file, "This is a formatted output.")
   julia> close(file)

   Here, the formatted string "This is a formatted output." is printed to a file named "output.txt".

3. Formatting numbers:

   julia> @printf("%.2f", 3.14159)
   3.14

   In this example, the number 3.14159 is formatted to have 2 decimal places and printed.

4. Combining multiple format specifiers:

   julia> @printf("Name: %s, Age: %d, Height: %.1f", "Alice", 25, 1.65)
   Name: Alice, Age: 25, Height: 1.6

   It showcases how to use multiple format specifiers to print different types of values in a single formatted string.

Common mistake example:

julia> @printf("The value is %d", "abc")
ERROR: MethodError: no method matching @printf(::LineNumberNode, ::Module, ::String, ::String)

In this example, the format specifier %d expects an integer value, but a string value is provided instead. Ensure that the format specifiers match the type of the values being passed to @printf to avoid such errors.

See Also

User Contributed Notes

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