Why does C use %% for a literal percent sign instead of %?
In C, backslashes are used for escape sequences in string literals, such as n for a newline or \ for a literal backslash. However, when using printf-style formatting,…
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Why does printf use %% instead of % to print a literal percent sign?
In C, backslashes are used for escape sequences in string literals, such as n for a newline or \ for a literal backslash. However, when using printf and…
How can I build a Bash logger with timestamps, colors, and printf-style arguments?
I want to write Bash logging helpers that add a timestamp and a colored severity label while sending diagnostic output to stderr. Standard output should remain available for…
How can I build a Bash logger with timestamps, colors, and printf formatting?
I'm writing Bash helper functions such as log_info, log_warn, and log_error. They should add a timestamp and colored severity label, while sending diagnostic output to stderr so stdout…
What’s the difference between `%p` and `%x` when printing pointers in C?
I'm learning the basics of C and I'm confused about the difference between the `%p` and `%x` format specifiers. I understand that `%p` is used to print a…
What’s the difference between %p and %x when printing pointers in C?
I'm learning the fundamentals of C and I'm confused about the printf format specifiers %p and %x. They can both appear to print an address in hexadecimal, so…
How can I implement a printf-style function with a custom prefix in C++?
I'm trying to create a C++ print() helper that behaves somewhat like printf(), but automatically adds a prefix and a newline. My current code stores the prefix in…
How can I create a printf-style function with a custom prefix in C++?
I'm trying to make a C++ print function that behaves like printf but adds a prefix and a newline. My current code produces an error saying that ISO…
Why does the formatted spacing disappear when I store printf output in a variable?
In Bash, printf appears to preserve field width when run directly, but the spaces seem to disappear after capturing its output with command substitution: $ printf "%-9s:" "since"…
How can I make a beep sound in C?
I've heard that you can make your PC beep using just one line of code in C, like calling `printf("a")` within the main function, but when I tried…