reading strings and then converting them

Hello

Im newbie on C and have a little problem.
So, I have ASCII file that with 1100 rows and 550 columns. I need to write a program what read tha file and then convert all those numbers to decimal number.
like: 5.5000000e+01 should be 55.000000


so how can i do it?



Abies

Code:

---

int main()
{
  /* your code going here */
  return 0;
}

---

Did you try to write something? Well you should read char by char and find out some logic to convert it to decimal

Use fscanf to read each number into a double. Once you have the number, you can print it out using printf in any format you want (decimal, scientific notation, so many digits after the decimal, etc).

I'm quite sure we didn't need the WHOLE file just to get the idea.
What have you tried so far?

my code to read file, but how can i split strings and then convert them?

Code:

---

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

int main( int argc, char *argv[] )
{
  char buffer[10000]; // longest line
  int i, nr;

  if ( argc != 2)
  {
          printf("usage: %s filename", argv[0]);
  }
  else
  {
        FILE *input = fopen( argv[1], "r");
   
    if ( input == NULL);
    {
        printf("Error opening file \n");
        exit(-1);
    }

    nr = 0; // line_nr before while 0
    while(fgets(buffer, sizeof(buffer), input) != NULL)
    {
        nr++; // increase number
        printf("%d.%s", nr, buffer); // puting line_nr before line
    }
    fclose (input);    // closing input_file
        return 0;
    }
}

---

Abies

right having this, replace the fgets function to fscanf function to read a double value from the file, and convert that into double. This is done internally by the fscanf

Code:

---

while(fscanf(fp,"%lf",&num) != EOF)  \\this converts from string to double internally, so don't need to do that convert separate
printf("%f\n",num);

---

ssharish2005

Code:

---

while(fscanf(fp,"%lf",&num) != EOF)
printf("%f\n",num);

---

I need that the program would leave all rows and columns at the same place, but would convert numbers into decimal.

Something like:

Code:

---

while(fgets(buffer, sizeof(buffer), input) != NULL)
{
        double number;
        while(sscanf(buffer,"%lf", &number) == 1)
                fprintf(output, "%10.6f ",num);
        fprintf(output, "\n");
}

---

?

:D

Code:

---

$ awk '{ for(i=1;i<=NF;i++) { printf("%f ",$i+0); } printf("\n"); }'
55
55.000000
5.5E1 22.001 3E-1
55.000000 22.001000 0.300000

---

Black text is input, red text is output
Just add a filename to the end of the command line and luxuriate ;)

oh.. my mistake

I need that program read number like 5.5009091e+01 from input file
then just convert it to 55.009091 and leave all rows and columns at the same place.

btw. thanks Salem:)