'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, th

Answer 1

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