In this tutorial, we will learn about how to create a program in C that converts any given decimal number by user at run-time into its equivalent hexadecimal value. We have also created a user-defined function-driven program that does the same job of converting decimal number to hexadecimal number. Decimal number has its base as That means it has total of 10 digits that are 0, 1, 2, And Hexadecimal number has its base as That means it has total of 16 digits that are 0, 1, 2, Because 10 has two digit that are 0 and 1, in same way 11 has two digit that are 1 and 1 and so on.
Therefore 10 is repsented with A, in same way 11 is represented with B, To convert decimal number to hexadecimal number in C programming, you have to ask from user to enter the decimal number to convert it into hexadecimal number, and then display the equivalent value in hexadecimal as output.
Following C program asks from user to enter any number in decimal to convert it into hexadecimal, then display the result on the screen:. As the above program was build and run under Code::Blocks IDE, therefore after successful build and run, you will get the following output. This is the first snapshot of the sample run:. Now supply any decimal number as input say and press ENTER key to see the equivalent hexadecimal value as output.
Here is the second snapshot of the sample run:. Now let's create the same program but without using any modulous operator. That is we have to find out the remainder without using modulous operator.
printf format string
Therefore to find out remainder, we have divided the number present inside decnum by 16, and stored its quotient value inside a variable say tempthen again multiply the quotient value with 16 and stored the multiplication result to a variable say chck. Now subtract chck from decnum decnum - chck and initialized it to rem variable, that will holds the current remainder.
Now decnum-chck or or 12 gets initialized to rem which is the remainder this time. In this way, we have replaced the modulous operator with three line of code as shown in the program given below:. Now let's create a user-defined function named DecToHex that takes one argument the decimal number entered by user. Here we have declared the variable i and the array hex outside both the function say main and DecToHex to make it known for both the function.
Here the variable i is declared as static variable because static variable remembers its previous value. One last thing is, we have not initialized the static variable i with 0 which is requiredbecause by default static variable holds 0 as its initial value after declaring the static variable. Rest of the thing is similar that can easily be understand by you. Tools Calculator.
print upper-case hexadecimal : printf « stdio.h « C / ANSI-C
The answer may be implementation specific. It must have something to do with the printf function interpreting the bytes 'a'NUL as part of a single wide character so it doesn't terminate the wide character string there. Keith Thompson. As far as the standard is concerned, it can do anything. Synonym for ls. Don't use. This is something.
Therefore, we must do this.
Rod Pemberton. Richard Heathfield. So the behaviour of your program is undefined, and it could do anything at all, including but by no means restricted to what you say it did do. This discussion thread is closed Start new discussion. Similar topics Help with "sweeping bar effect" ActionScript 2. MapPath What "type" is returned?
Can someone explain what "Server Busy" dialog is? No "side effect" assignment! Question stats viewed: replies: 4 date asked: Sep 12 '06 Follow this discussion. Follow us to get the Latest Bytes Updates. Sep 12 '06 Post Reply.The format string is a character string which contains two types of objects: plain characters, which are simply copied to the output channel, and conversion specifications, each of which causes conversion and printing of arguments.
The optional width is an integer indicating the minimal width of the result. The optional precision is a dot. This integer argument precedes immediately the argument to print.
Same as Printf. Useful to ignore some material when conditionally printing. Same as fprintfbut instead of returning immediately, passes the out channel to its first argument at the end of printing. Same as kfprintf above, but does not print anything. Same as sprintf above, but instead of returning the string, passes it to the first argument. Same as bprintfbut instead of returning immediately, passes the buffer to its first argument at the end of printing. The types and their meanings are: di : convert an integer argument to signed decimal.
The flag adds underscores to large values for readability. Warning: nlLand N are used for scanfand should not be used for printf. The flag adds a 0x prefix to non zero values. X : convert an integer argument to unsigned hexadecimal, using uppercase letters. The flag adds a 0 X prefix to non zero values. The flag adds a 0 prefix to non zero values. S : convert a string argument to OCaml syntax double quotes, escapes. C : convert a character argument to OCaml syntax single quotes, escapes.
F : convert a floating-point argument to OCaml syntax dddd. Converts to hexadecimal with the flag see h. Moreover, any trailing zeros are removed from the fractional part of the result and the decimal-point character is removed if there is no fractional part remaining. B : convert a boolean argument to the string true or false b : convert a boolean argument deprecated; do not use in new programs. Take two arguments and apply the first one to outchan the current output channel and to the second argument.
The output produced by the function is inserted in the output of fprintf at the current point. The argument must have the same type as the internal format string fmt. Take a format string argument and substitute it to the internal format string fmt to print following arguments. The optional flags are: - : left-justify the output default is right justification. A deprecated synonym for ksprintf.MalformedURLException; import java. COM 6. Using Java's printf Method 6.
Demonstrate printf 6. Formatting Numerical Data: 6. Specifying the Width and Precision 6. Formatting Characters and Strings 6. Formatting Data into a String 6. Formatting a string and Ouputing to console 6. Formated System. Using the integral conversion characters 6.
Using floating-point conversion characters 6. Using character and string conversion characters. Conversion characters for date 6. Conversion characters for time 6. Right justifying integers in fields: Field Width 6. Using precision for floating-point numbers and strings 6. Right justifying and left justifying values 6. Printing a space before non-negative values 6. Using the flag with conversion characters o and x 6. Printing with the 0 zero flag fills in leading zeros 6.
Using the commaflag to display numbers with thousands separator 6. Using the flag to place parentheses around negative numbers 6. Reordering output with argument indices. Using Java's printf Method. Demonstrate printf. Formatting Numerical Data:. Specifying the Width and Precision. Formatting Characters and Strings. Formatting Data into a String. Formatting a string and Ouputing to console.
Using the integral conversion characters. Using floating-point conversion characters. Conversion characters for date. Conversion characters for time. Right justifying integers in fields: Field Width.The printing and formatting functions are technically library functions, but in practice they as used as if they were part of the core language. The composite formatting technique is available in all. NET languages, and you are probably familiar with it from C.
The printf technique, on the other hand, is based on the C-style format strings:. As you have seen, the printf technique is very common in Fwhile String. FormatConsole. Write and so on, are rarely used.
Why is printf preferred and considered idiomatic for F? The reasons are:. Unlike String. Formatprintf is statically type checkedboth for the types of the parameters, and the number. For example, here are two snippets using printf that will fail to compile:.
The equivalent code using composite formatting will compile fine but either work incorrectly but silently, or give a runtime error:. But printf is a standard, well-behaved F function, and so supports partial application. And of course, printf can be used for function parameters anywhere a standard function can be used. For non-primitive types, the.
NET formatting functions, you will have to override the ToString method explicitly. First, if there are too few parameters, rather than too many, the compiler will not complain immediately, but might give cryptic errors later. The reason, of course, is that this is not an error at all; printf is just being partially applied! See the discussion of partial application if you are not clear of why this happens.
In the. NET formatting model, the formatting strings are normal strings, so you can pass them around, store them in resource files, and so on. Which means that the following code works fine:. Which means that the following code does not work:.
If you want to emulate the compiler, you can create your own TextWriterFormat value from a string using the Printf. TextWriterFormat type in the Microsoft. Printf module. But if the format string is truly dynamic e.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm trying to printf unsigned short in hex, e. The problem is that I want a lowercase x not X. I have no idea how to do this. Outputs the number as 0xffff.Printing Hexadecimal Value of an Integer in C
If pixel is an array of unsigned shorts and you want the format to match the data, you can do:. Learn more. Asked 4 years, 1 month ago.
Active 4 years, 1 month ago. Viewed 13k times. Joedie Joedie Joedie 1 1 gold badge 4 4 silver badges 10 10 bronze badges. I already presumed that. Still you pass an int.
Decimal to UpperCase Hex String on Go
Just read about integer promotions and read the printf man-page resp. No, it is not. Why don't you read the documentation of functions you use? The information is available online. Oh, and about the 0x : That is not possible automatically I dislike this, too. But there is an obvious and simple solution. Remember you can have normal text in the format string, too. Active Oldest Votes. I suspect OP just wants the the x lowr case as he states in the question.
Note that the argument has to be unsigned int to avoid implementation defined behaviour, which requires a cast. There is no implementation defined behavior concerns here with or without a unsigned cast.
Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Featured on Meta.In both cases these provide simple functionality and fixed format compared to more sophisticated and flexible template engines or parsers, but are sufficient for many purposes.
Mismatches between the format specifiers and type of the data can cause crashes and other vulnerabilities. The format string itself is very often a string literalwhich allows static analysis of the function call. However, it can also be the value of a variable, which allows for dynamic formatting but also a security vulnerability known as an uncontrolled format string exploit.
Early programming languages such as Fortran used special statements with completely different syntax from other calculations to build formatting descriptions:.
C's printf has its origins in BCPL 's writef function Probably the first copying of the syntax to outside the C language was the Unix printf shell command, which first appeared in Version 4as part of the porting to C.
Formatting takes place via placeholders within the format string. For example, if a program wanted to print out a person's age, it could present the output by prefixing it with "Your age is ". To denote that we want the integer for the age to be shown immediately after that message, we may use the format string:.
The Parameter field can be omitted or can be:. This feature mainly sees its use in localization, where the order of occurrence of parameters vary due to the language-dependent convention. The Width field specifies a minimum number of characters to output, and is typically used to pad fixed-width fields in tabulated output, where the fields would otherwise be smaller, although it does not cause truncation of oversized fields. Though not part of the width field, a leading zero is interpreted as the zero-padding flag mentioned above, and a negative value is treated as the positive value in conjunction with the left-alignment - flag also mentioned above.
The Precision field usually specifies a maximum limit on the output, depending on the particular formatting type. For floating point numeric types, it specifies the number of digits to the right of the decimal point that the output should be rounded. For the string type, it limits the number of characters that should be output, after which the string is truncated.
For floating point types, this has no effect. Additionally, several platform-specific length options came to exist prior to widespread use of the ISO C99 extensions:. ISO C99 includes the inttypes. These must be outside double-quotes, e. There are a few implementations of printf -like functions that allow extensions to the escape-character -based mini-languagethus allowing the programmer to have a specific formatting function for non-builtin types. However, it is rarely used due to the fact that it conflicts with static format string checking.
Another is Vstr custom formatterswhich allows adding multi-character format names. If the syntax of a conversion specification is invalid, behavior is undefined, and can cause program termination. If there are too few function arguments provided to supply values for all the conversion specifications in the template string, or if the arguments are not of the correct types, the results are also undefined. Excess arguments are ignored. In a number of cases, the undefined behavior has led to " Format string attack " security vulnerabilities.
Some compilers, like the GNU Compiler Collectionwill statically check the format strings of printf-like functions and warn about problems when using the flags -Wall or -Wformat.
Loss of field separation can easily lead to corrupt output. In systems which encourage the use of programs as building blocks in scripts, such corrupt data can often be forwarded into and corrupt further processing, regardless of whether the original programmer expected the output would only be read by human eyes.
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