Which can help me to change, how to output the window function value, thank you!

# include "math. H"
# include & lt; Stdlib. H>
# include & lt; Stdio. H>
# include & lt; String. H>
# define PI 3.1415926
Void hammingWin (int N, double * * w);
Void hammingWin (int N, double * * w)
{
int n;
Double * ret;

Ret=(double *) malloc sizeof (N * (double));
If (ret=! NULL)


For (n=0; N & lt; N; N++)
{
+ n * (ret)=0.54-0.46 * cos (2 * PI * (double) n/(n - 1));
}

* w=ret;


Free (ret);
return ;
}

Void main ()
{
int n;
Double * ret;

* ret=hammingWin (9, & amp; W);

Printf (" % f ", * ret);

}

CodePudding user response:

If (ret=! NULL) is the if (ret!=NULL)

CodePudding user response:

Double hammingWin (int N)
{
Double ret.
,,,
Ret=you dongdong

Return (ret);

}


Double xx;
Xx=hammingWin (8);
Printf (" % f ", xx);

CodePudding user response:

This pointer,,, good chaos

CodePudding user response:

Calls the method is wrong, it should be:
Double * ret;
HammingWin (9, & amp; Ret);
Printf (" % f ", * ret);

CodePudding user response:

In addition, free (ret); Do not put in hammingWin inside, this line of take out, should be;
Double * ret;
HammingWin (9, & amp; Ret);
Printf (" % f ", * ret);
Free (ret);