String exponent number to integer and double conversion

Question

Anyone who can help please,
I am receiving data back from an Agilent E4407B with the noise figure option in the following form:
+1.00000000E+008,+1.52799997E+001,+1.00000000E+009,+1.52200003E+001,+2.00000000E+009,+1.51099997E+001,+3.00000000E+009,+1.50799999E+001,
for up to 401 pairs of frequencies and amplitude figures.  This is all coming back in one long string.
I want to read the pairs of figures into a 2 dimensional array, so that the first part of the array has the frequency in an double format, but NO exponent, and the second part of the array has the ENR value agan in a double format and also with NO exponent.
I have been using:
double ENR_Data[401][2];
Scan(Databuf,"%s>%401f[x]",&ENR_Data);
This reads the data into the array, but retains the exponent - please can someone show me the correct Scan formatting functions to use so that I keep just the number, and loose the scientific exponent format?
Many thanks for any help,
Allen Cherry

Answer 1

Allen:
It doesn't matter how you represent the doubles: the compiler represents them the same.
double a = 2000000000.00;
double b = 2e9;
As far as the compiler is concerned (and as far as you should be concerned), a==b.
In your last reply, your interpolated value of (say) 25000000000 = 2.5e10, which is greater than 2e9 and 3e9.  You said you may have the wrong number of zeros in the example, but please make sure you have the right number of zeros in your code.
Are you sure you are handling the array correctly?  Remember that the array subscripts are [row][column].  From your sample data, the frequency values are in column 0.  The first frequency value would be ENR_Data[0][0].  The second frequency value would be ENR_Data[1][0], followed by ENR_Data[2][0], etc.
Check the code I included below.  It's based on the numbers shown in your example.  It correctly determines if a number is greater than or less than a desired interpolated point.
P.S. What algorithm are you using to do you interpolation?  I don't even know why you are searching for a number greater than some known value: you should be interpolating between points read from the array.
#include <ansi_c.h>
#include <utility.h>
#include <formatio.h>
main()
 char Databuf[] = "+1.00000000E+008,+1.52799997E+001,+1.00000000E+009,+1.52200003E+001,"
     "+2.00000000E+009,+1.51099997E+001,+3.00000000E+009,+1.50799999E+001";
 double ENR_Data[401][2];
 double interpValue = 2.5E9;
 // same as
 // double interpValue = 2500000000.00;
 int i;
 Scan(Databuf,"%s>%401f[x]",&ENR_Data);
 for (i=0; i<4; i++)
  if (ENR_Data[i][0] > interpValue)
   printf("%f (%e) > %f (%e)\n",
    ENR_Data[i][0], ENR_Data[i][0],
    interpValue, interpValue);
  else
   printf("%f (%e) <= %f (%e)\n",
    ENR_Data[i][0], ENR_Data[i][0],
    interpValue, interpValue);
 printf("Press any key to continue...\n");
 GetKey();