Posted By: Anonymous
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",&a); printf("--------n"); scanf("%ld",&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”, &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.
%lf format specifier to read a double:
double a; scanf("%lf",&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: