Use – to left align a field. printf “Echoing random number %-5s [ OK ]” $RAND_NUM Alternatively, if you’re on a Red Hat Linux system there are predefined functions that will print out green OK and red FAILED prompts (the ones you see during bootup): #!/bin/bash . /etc/init.d/functions echo -n “Frobbing widget:” frob_widget && echo_success … Read more
Try: printf(“%04x”,a); 0 – Left-pads the number with zeroes (0) instead of spaces, where padding is specified. 4 (width) – Minimum number of characters to be printed. If the value to be printed is shorter than this number, the result is right justified within this width by padding on the left with the pad character. … Read more
It’s all in the documentation! $str=”Str 1: %1$s – Str 2: %2$s – Str 2 again: %2$s”; echo sprintf($str, “I’m string 1”, “My name is string 2”); Note: Use single quotes for the format string otherwise you’ll get PHP Notice: Undefined variable: s in /path/to/tofile:line You can also escape the $ with a \ if … Read more
The two expressions you gave are not equivalent: sprintf takes no argument specifying the maximum number of bytes to write; it simply takes a destination buffer, a format string, and a bunch of arguments. Therefore, it may write more bytes than your buffer has space for, and in so doing write arbitrary code. The %.*s … Read more
They are completely equivalent when used with printf(). Personally, I prefer %d, it’s used more often (should I say “it’s the idiomatic conversion specifier for int“?). (One difference between %i and %d is that when used with scanf(), then %d always expects a decimal integer, whereas %i recognizes the 0 and 0x prefixes as octal … Read more
Use the format specifier %p: printf(“variable A is at address: %p\n”, (void*)&A); The standard requires that the argument is of type void* for %p specifier. Since, printf is a variadic function, there’s no implicit conversion to void * from T * which would happen implicitly for any non-variadic functions in C. Hence, the cast is … Read more
Your format specifier is incorrect. From the printf() man page on my machine: 0 A zero ‘0‘ character indicating that zero-padding should be used rather than blank-padding. A ‘-‘ overrides a ‘0‘ if both are used; Field Width: An optional digit string specifying a field width; if the output string has fewer characters than the … Read more
You can do this as follows: printf(“%*d”, width, value); From Lee’s comment: You can also use a * for the precision: printf(“%*.*f”, width, precision, value); Note that both width and precision must have type int as expected by printf for the * arguments, type size_t is inappropriate as it may have a different size and … Read more
You can convert an NSString into a UTF8 string by calling the UTF8String method: printf(“%s”, [string UTF8String]);
Due to some performance reasons %f is not included in the Arduino’s implementation of sprintf(). A better option would be to use dtostrf() – you convert the floating point value to a C-style string, Method signature looks like: char *dtostrf(double val, signed char width, unsigned char prec, char *s) Use this method to convert it … Read more