Im codding a programm that has multiple functions.

Once functions calculates the means of 2 sets of data and prints meanx and meany.

Now another function will use those means to do some other calculation.

I dont know how to get those values from one function and pass them into another?
Can anyone help me here??

Thank you

ok, here is example code

``````void print(int x, int y)
{
cout << x << " " << y << "\n";
}

void calculate( int* meanx, int* meany)
// The two parameters are pointers to the integers that
// are declared in main()
{
*meanx = 1;
*meany = 2;
}

int main()
{
int meanx = 0;
int meany = 0;
calculate(&meanx, &meany);
print(meanx, meany);
}``````

ok, here is example code

``````void print(int x, int y)
{
cout << x << " " << y << "\n";
}

void calculate( int* meanx, int* meany)
// The two parameters are pointers to the integers that
// are declared in main()
{
*meanx = 1;
*meany = 2;
}

int main()
{
int meanx = 0;
int meany = 0;
calculate(&meanx, &meany);
print(meanx, meany);
}``````

Can u show me in this code, I still didnt quet grasp it.

``````#include <stdio.h>
#include <string.h>
#include<stdlib.h>

typedef struct
{
unsigned int larray;
double *x;
double *y;
}data;

double getArrayBar( double *array , int length ) ;

data getdata(const char file[]);
double corr(data data_sm);

int main(void)
{
data data_sm;

char filename[20];

printf("\nEnter the file name  : ");
scanf("%s",&filename);

data_sm = getdata(filename);

corr(data_sm);

return 0;
}

double getArrayBar( double *array , int length )
{
double sum = 0 ;
for ( int i = 0 ; i < length ; i++ )
sum += array[i] ;

return sum/length ;
}

data getdata(const char file[])
{
data d;
int i=0,j=0;
FILE *inputFile;
double meanx, meany;
/*double a[200],b[200];*/
d.x = 0;
d.y = 0;
inputFile = fopen(file,"r");

if(inputFile == NULL)
{
printf ("Error opening data file \n");
exit(1);
}

do
{

d.x = realloc(d.x, (i+1)*sizeof(double));
d.y = realloc(d.y, (i+1)*sizeof(double));
i++;

if(!d.y || !d.x) {
printf("Allocation Error\n");
exit(1);}
}
while(fscanf(inputFile,"%lf %lf",&d.x[i-1],&d.y[i-1]) == 2);

meanx = getArrayBar (d.x , i -1 );
meany = getArrayBar (d.y , i -1 );

printf("X bar is %lf\n", meanx) ;
printf("Y bar is %lf\n", meany) ;

fclose(inputFile);
free (d.x);
free (d.y);
return d;
}
/* Calculates the linear correlation coeffcient */
double corr(data data_sm)
{

}``````

As you can see one function reads a file and calculates the means of x and y, now in function double corr i want to be able to use meanx and meany.

``````double corr(data data_sm, double meanx, double meany);

data getdata(const char file[], double* meanx, double* meany)
{
<snip>
*meanx = getArrayBar (d.x , i -1 );
*meany = getArrayBar (d.y , i -1 );

}

int main()
{
double meanx = 0, meany = 0;
<snip>
data_sm = getdata(filename, &meanx, &meany);
corr(data_sm, meanx, meany);
}``````