charactor selection from cmd

Dear All,
after compiling, I run the program as:
program.exe infile outfile foldpoint vel base. I.e. I type 6 arguments.
The program works good. Now I want to make some modifications and dont know how to do it.
I want to make 1 extra argument (it can be either 't' or 's'), so that I type
program.exe infile outfile foldpoint vel base t or s.
If I type t, then in the following code (line 86), fprintf should be executed.
If I type s, then in the following code (line 87), /* fprintf...*/ should be executed. Please help me how can I do it?
Another help (but not important!):
In the program dp is the integer value obtained from line 70. And this integer value is used in fprintf (refer line 86 or 87). I cannot use this value directly without including lines 73-80. So I need to repeat the lines 48-56 two times. The lines 48-56 and 73-80 are same. Are there any way to avoid 73-80? So the program looks more compact.
cos is cosine! 3.14 is pi, instead of using 3.14 I want to declare pi constant efficiently in c program.
For this C codes I was actually interested to make my own program (https://cboard.cprogramming.com/c-pr...plication.html). But it seems it is difficult and I dropped my plan.

My code:

Code:

---

#include <stdio.h>
#include <stdlib.h>
#define MAX 10000
 
int main(int argc, char *argv[])
{
  FILE *fs, *ft;
  char *foldpoint, line[MAX];
  int i, low, high, n[MAX], size,sum,dp;
  double fp,v,b;
   
  if (argc != 6) {
    puts("Improper number of arguments\nType rawfilename outputfilename foldingpoint velocity baseline");
    exit(0);
  }
 
  fs = fopen(argv[1], "r");
  if (fs == NULL) {
    puts("Cannot open source file");
    exit(0);
  }
 
  ft = fopen(argv[2], "w");
  if (ft == NULL) {
    puts("Cannot open target file");
    exit(0);
  }
 
  foldpoint = argv[3];
  sscanf(foldpoint, "%lf", &fp);
  printf("Folding point= %lf\n", fp);
 
  sscanf(argv[4], "%lf", &v);
  printf("Drive velocity= %lf\n", v);
   
  sscanf(argv[5], "%lf", &b);
  printf("Base line counts= %lf\n", b);
   
  i = 0;
  while (fgets(line, sizeof(line), fs)) {
    sscanf(line, "%d", &n[i]);
    i++;
    if (i == (int)fp) {
      printf("%lf is %s", fp, line);
    }
  }
 
  size = i;
  if (fp == (int)fp) {
    low = (int)fp;
    high = low;
  }
  else {
  low = (int)fp;
  high = low + 1;
  }

  sum=0;
  low--;
  high--;
  i = 0;
  while (low >= 0 && high < size) {
    sum=sum+((n[low]-n[high])*(n[low]-n[high]));
    i++;
    low--;
    high++;
    dp=i;
  }
   
  printf("Number of data points= %d\n", dp);
  printf("Sum of the sqaured differences= %d\n", sum);
 
  if (fp == (int)fp) {
    low = (int)fp;
    high = low;
  }
  else {
  low = (int)fp;
  high = low + 1;
  }
 
  low--;
  high--;
  i = 0;
  while (low >= 0 && high < size) {
  fprintf(ft, "%lf  %lf\n", ((2*i)-dp+1)*v/(dp-1), (n[low]+n[high])*100/b);
/*fprintf(ft, "%lf  %lf\n", v*cos(2*i*3.14/(dp-1)), (n[low]+n[high])*100/b);*/
  i++;
  low--;
  high++;
  }
 
fclose(fs);
fclose(ft);
 
return 0;
}

---

Thanks for your help.
Cheers,
Raja.

Well your question illustrates perfectly the down-side of begging others to do all your work.
https://cboard.cprogramming.com/c-pr...und-point.html
The begging never stops, because you never learn anything.

> The program works good. Now I want to make some modifications and dont know how to do it.
> I want to make 1 extra argument (it can be either 't' or 's'), so that I type
> program.exe infile outfile foldpoint vel base t or s.
Good, print off the program on some paper, use a highlight pen to colour in all the occurrences of 'argc' and 'argv', then try and figure it out.
Make an attempt.


> Are there any way to avoid 73-80? So the program looks more compact.
Sure, do something like
int lowsave = low;

// mess around with low

// get back the original
low = lowsave;


> 3.14 is pi, instead of using 3.14 I want to declare pi constant efficiently in c program.
Well you (well, someone else - you failed to understand it) used #define.
Perhaps you could investigate and use the same idea.

Hello
I tried

Code:

---


#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define MAX 10000
#define PI 3.14
 
int main(int argc, char *argv[])
{
  FILE *fs, *ft;
  char *foldpoint, line[MAX],m,t;
  int i, low, high, n[MAX], size,sum,dp;
  double fp,v,b;
   
  if (argc != 7) {
    puts("Improper number of arguments\nType rawfilename outputfilename foldingpoint velocity baseline t(or)s");
    exit(0);
  }
 
  fs = fopen(argv[1], "r");
  if (fs == NULL) {
    puts("Cannot open source file");
    exit(0);
  }
 
  ft = fopen(argv[2], "w");
  if (ft == NULL) {
    puts("Cannot open target file");
    exit(0);
  }
 
  foldpoint = argv[3];
  sscanf(foldpoint, "%lf", &fp);
  printf("Folding point= %lf\n", fp);
 
  sscanf(argv[4], "%lf", &v);
  printf("Drive velocity= %lf\n", v);
   
  sscanf(argv[5], "%lf", &b);
  printf("Base line counts= %lf\n", b);
 
  sscanf(argv[6], "%c", &m);
  printf("Source motion= %c\n", m);
   
  i = 0;
  while (fgets(line, sizeof(line), fs)) {
    sscanf(line, "%d", &n[i]);
    i++;
    if (i == (int)fp) {
      printf("%lf is %s", fp, line);
    }
  }
 
  size = i;
  if (fp == (int)fp) {
    low = (int)fp;
    high = low;
  }
  else {
  low = (int)fp;
  high = low + 1;
  }

  sum=0;
  low--;
  high--;
  i = 0;
  while (low >= 0 && high < size) {
    sum=sum+((n[low]-n[high])*(n[low]-n[high]));
    i++;
    low--;
    high++;
    dp=i;
  }
   
  printf("Number of data points= %d\n", dp);
  printf("Sum of the sqaured differences= %d\n", sum);
 
  if (fp == (int)fp) {
    low = (int)fp;
    high = low;
  }
  else {
  low = (int)fp;
  high = low + 1;
  }
 
  low--;
  high--;
  i = 0;
  while (low >= 0 && high < size) {
  if (m=t){
  fprintf(ft, "%lf  %lf\n", ((2*i)-dp+1)*v/(dp-1), (n[low]+n[high])*100/b);
  i++;
  low--;
  high++;
  }
  else {
  fprintf(ft, "%lf  %lf\n", v*cos(i*PI/(dp-1)), (n[low]+n[high])*100/b);
  i++;
  low--;
  high++;
  }}
 
fclose(fs);
fclose(ft);
 
return 0;
}

---

Not bad - see what you can achieve if you try for yourself first.

> if (m=t)
What's the difference between = and == ?
What's the difference between m == t and m == 't' ?

Now that you've defined PI, how about adding a few more significant digits?

Hello Salem,
after your tips, I understand = and == and 't' and improved with if, else if and else command. So that the code now is very strict; only s or t in cmd works. Also used M_PI without declaring/define PI value (but I prefer to use define PI and use it, because of compilation problems).
But I really dont understand

PHP Code:

---

int lowsave = low;
// mess around with low
// get back the original
low = lowsave; 


---

so that the repeated lines 87-94 can be removed

Code:

---

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define MAX 10000
 
int main(int argc, char *argv[])
{
  FILE *fs, *ft;
  char *foldpoint, line[MAX],m,t;
  int i, low, high, n[MAX], size,sum,dp;
  double fp,v,b;
   
  if (argc != 7) {
    puts("Improper number of arguments\nType rawfilename outputfilename foldingpoint velocity baseline t(or)s");
    exit(0);
  }
 
  fs = fopen(argv[1], "r");
  if (fs == NULL) {
    puts("Cannot open source file");
    exit(0);
  }
 
  ft = fopen(argv[2], "w");
  if (ft == NULL) {
    puts("Cannot open target file");
    exit(0);
  }
 
  foldpoint = argv[3];
  sscanf(foldpoint, "%lf", &fp);
  printf("Folding point= %lf\n", fp);
 
  sscanf(argv[4], "%lf", &v);
  printf("Drive velocity= %lf\n", v);
   
  sscanf(argv[5], "%lf", &b);
  printf("Base line counts= %lf\n", b);
 
  sscanf(argv[6], "%c", &m);{
  if (m=='t') {
    printf("Source motion= Triangular/Constant acceleration motion\n");
    }
  else if (m=='s') {
    printf("Source motion= Sinus motion\n");
    }
  else {
    puts("Type either t or s; t for triangular/constant acceleration motion,\ns for sine motion");
    exit(0);
    }
  }
   
  i = 0;
  while (fgets(line, sizeof(line), fs)) {
    sscanf(line, "%d", &n[i]);
    i++;
    if (i == (int)fp) {
      printf("%lf is %s", fp, line);
    }
  }
 
  size = i;
  if (fp == (int)fp) {
    low = (int)fp;
    high = low;
  }
  else {
  low = (int)fp;
  high = low + 1;
  }

  sum=0;
  low--;
  high--;
  i = 0;
  while (low >= 0 && high < size) {
    sum=sum+((n[low]-n[high])*(n[low]-n[high]));
    i++;
    low--;
    high++;
    dp=i;
  }
   
  printf("Number of data points= %d\n", dp);
  printf("Sum of the sqaured differences= %d\n", sum);
 
  if (fp == (int)fp) {
    low = (int)fp;
    high = low;
  }
  else {
  low = (int)fp;
  high = low + 1;
  }
 
  low--;
  high--;
  i = 0;
  while (low >= 0 && high < size) {
    if (m=='t'){
    fprintf(ft, "%lf  %lf\n", ((2*i)-dp+1)*v/(dp-1), (n[low]+n[high])*100/b);
    i++;
    low--;
    high++;
    }
    else {
    fprintf(ft, "%lf  %lf\n", v*cos(i*M_PI/(dp-1)), (n[low]+n[high])*100/b);
    i++;
    low--;
    high++;
  }
  }
 
fclose(fs);
fclose(ft);
 
return 0;
}

---

After line 70, you do
lowsave = low;

Instead of lines 87 to 94, you do
low = lowsave;

Hello Salem,
Thanks! I tried using you lowsave options and it did not work. Only first 2 rows were computed. Then I included printf statements after line 70 and after 87 to know what is happening (I did this after deleting 87 to 94). Then looked at the repeated lines 87-94 or 62-70. Obviously I forgot the increment part and so introduced highsave option with printf statements..Now I hope it is working perfect.
In the above c code I included the following after 70:
lowsave = low;
highsave = high;
and instead of lines 87 to 94, I included:
low = lowsave;
high= highsave;
Now the code producing the right output hopefully.
Cheers,
Raja. (in case of any logical errors if you see, inform me)