A date increment function for fixing the bug of the vendor CDR web page of the billing interface

Download the C program [c], [txt] (129 KB).

Compile the program:

You can run the program providing the date and the increment as arguments. If you enter erroneous values, corresponding error message will be displayed:

Examples of normal execution are below:

The date increment C function can be compiled with and directly used from another program:

int dayinc(int y1, char m1, char d1, int *y2, char *m2, char *d2, int inc)

{

  int i;

  for(i=0;i<elements;i++)

    if(days[i].y==y1 && days[i].m==m1 && days[i].d==d1)

      break;

  if(!(i<elements))

    return 1;

  if(!(i+inc>=0 && i+inc<elements))

    return 2;

  *y2=days[i+inc].y;

  *m2=days[i+inc].m;

  *d2=days[i+inc].d;

  return 0;

}

The dates are not computed analytically. A wide continuous range of days is statically stored in the C program. The range is generated in an excel file [xls].

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