Questions about standard input in C

116640129

There is a question, do it well with C ++
What can I do wrong when using C? Later, I found that it was a problem with the input when debugging. C didn't know much ...
Wrote a paragraph
int main ()
{
        double a;
        scanf ("% f",&a);
        printf ("% f", a);
        return 0;
}

Whatever the input is, the output is 0.0000000 (in the case of small numbers). What is wrong?

jjledu

The format of double is %lf, just change it

       double a;
        scanf("%lf",&a);
        printf("%lf", a);

orangedj

scanf("%lf",&a);