sprintf double precision in C

Question

Consider   double a   0 0000005l  char aa 50   sprintf aa    lf   a   printf   s   aa    Output  s0 000000   In the above code snippet  the variable aa can contain only six decimal precision  I would like to get an output like  s0 0000005   How do I achieve this

User · Answer

The problem is with sprintf  sprintf aa   lf  a      lf says to interpet  a  as a  long double   16 bytes  but it is actually a  double   8 bytes    Use this instead   sprintf aa    f   a     More details here on cplusplus com

User · Answer

You need to write it like sprintf aa    9 7lf   a   Check out http   en wikipedia org wiki Printf for some more details on format codes

User · Answer

From your question it seems like you are using C99  as you have used  lf for double   To achieve the desired output replace   sprintf aa    lf   a     with  sprintf aa    0 7f   a     The general syntax   A B  means to use B digits after decimal point  The meaning of the A is more complicated  but can be read about here

[c] 'sprintf': double precision in C

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