Reading in double values with scanf in c

Question

I try to read-in 2 values using scanf   in C  but the values the system writes into memory are not equal to my entered values  Here is the code   double a b  printf  -------- n      seperate lines scanf   ld   amp a   printf  -------- n     scanf   ld   amp b   printf   d  d  a b     If I enter 1 and 2  CMD returns a correct  but b   -858993460 Here is what I already tried  using float or int instead of double  using scanf s  using scanf   d or  f for  i or  li or  lf or  e or  g    using fflush stdin  to clear keyboard buffer  reading in b first  trying like all possible combinations  I found out that there is a problem with the length of double on 32 bit OS  so that you are forced to use scanf   lf    amp f  to read in a double  No matter what I do  second value is always wrong   I use MS VS express 2012 for Desktop on Windows 7 32 bit OS

User · Accepted Answer

Use the  lf format specifier to read a double   double a  scanf   lf   amp a     Wikipedia has a decent reference for available format specifiers   You ll need to use the  lf format specifier to print out the results as well   printf   lf  lf  a b

User · Answer

You are using wrong formatting sequence for double  you should use  lf instead of  ld   double a  scanf   lf   amp a

User · Answer

Use this line of code when scanning the second value  scanf    lf    amp b   also replace all  ld with  lf   It s a problem related with input stream buffer  You can also use fflush stdin   after the first scanning to clear the input buffer and then the second scanf will work as expected  An alternate way is place a getch    or getchar    function after the first scanf line

User · Answer

Format specifier in printf should be  f for doubl datatypes since float datatyles eventually convert to double datatypes inside printf   There is no provision to print float data   Please find the discussion here    Correct format specifier for double in printf

User · Answer

As far as i know  d means decadic which is number without decimal point  if you want to load double value  use  lf conversion  long float   for printf your values are wrong for same reason   d is used only for integer  and possibly chars if you know what you are doing  numbers   Example   double a b  printf  -------- n      seperate lines scanf   lf   amp a   printf  -------- n     scanf   lf   amp b   printf   lf  lf  a b

User · Answer

Using  lf will help you in solving this problem   Use    scanf   lf   amp doub

[c] Reading in double values with scanf in c

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