Initialize a double array with int values in C. 1. can someone explain the purpose of %f and %d to me? This is the only correct way for compilers that comply with С99 or later. filter_none. an integer is the next variable on the stack, then printf() will output garbage. If you say to output the next field using a %Lf, then printf() will assume that a long double is waiting there. The code is the following: Anyway, many compilers still use the ANSI way and allow printing doubles with the old %f. There are many other interesting and tricky format specifiers in C language about which you can read on our Format Specifiers in C … 0. printf("This is a long double:\t%.9f\n", ld);} Works in Pelles C: This is a long long: 1234567890123456789 This is a long double: 1234567890.1234567 46... but as Czerny already wrote, the long double is not that long - it's an 8-byte double. Microsoft VC shows the same behaviour. In C programming, printf() is one of the main output function. C double - declaring variables. We have to include “stdio.h” file as shown in below C program to make use of these printf() and scanf() library functions in C language. I tried to printf long double float type on different computers including two Windows and one Mac but it turns out that none of them is working as I expected. Which means that lf should be preferred over f for double values. C Output. Moreover, it was legalized in C99 specifically to fix than annoying inconsistency between format specifiers in fscanf and fprintf. This is C99 standard. printf("for double values: \n"); double_solve(da, db, dc); return 0; } chevron_right. Similarly for printing double quotes(” “), using printf() in C we make use of ” \” ” backslash followed by double quote format specifier. If a simple double or (heaven forbid!) All these double type printing is very confusing in C++. You can see this question on Stackoverflow: for scanf: %f is float, %lf is double, %Lf is long double; for printf: %f is double, %Lf is long double. The function sends formatted output to the screen. Output: roots of equation x2 - 4.0000000 x + 3.9999999 = 0 are : for float values: 2.00000 2.00000 for double values: 2.00032 1.99968 This article is contributed by Mandeep Singh. 518. What is the argument for printf that formats a long? Finding what is the current standard requires some more efforts, so I'll stop here. 464. Printf, doubles and decimal places This example program demonstrates how to print double-precision numbers to a certain number of decimal places using printf . – AnT Mar 10 '16 at 1:05 printf() is not type safe. It has no way to double check. I am using GNU GCC compiler. Declaring a variable is just like with any other type: double price = 9.95; Printing uses the format specifier %lf (%lg, %le or %la are equivalent). f is for float. [Update] The results would still be the same no matter I use lf, Lf, llf...I am using Code Blocks to compile and run my C program. 1. printf() function in C language: In C programming language, printf() function is used to print the (“character, string, float, integer, octal and … C printf int and double same resault diffrent assumes-1. lf is a perfectly appropriate format specifier for double. Scanning data into a multidimensional array. Related. additional arguments − Depending on the format string, the function may expect a sequence of additional arguments, each containing one value to be inserted instead of each %-tag specified in the format parameter (if any). For example, You might find a gcc or MinGW library that has a 10-byte double. The argument is interpreted as a long double (only applies to floating point specifiers: e, E, f, g and G). Places using printf for printf that formats a long way and allow doubles... 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