c program

[Jasko989]

Hi, im pretty new to C

im trying to make a program that will read a input.dat file
John Smith
Ben Some
Jeff More

and output it to output.dat file but
Smith John
Some Ben
Jeff More

using sequential file

Thank you

[Jasko989]

well i can do that but when i use fgetc
but im pretty sure im suppose to use fgets for that

[Jasko989]

ok i've heard of scanf but whats sscanf
and one more thing please
how do i exchange the First name and last name
John Smith
to
Smith John
once i assigned the values to variables how do i output it

[Jasko989]

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

FILE *fp, *out;
main()
{
char FName;
char LName;
char ch;


if((fp = fopen("client.dat","r")) == NULL)
{
printf("\nNo file opened.");
exit(1);
}

if((out = fopen("output.dat", "w")) == NULL)
{
printf("\nNo output file opened.");
exit(1);
}

while fgets(ch, 0, fp) != EOF) (
scanf("%s", &FName);
scanf("%s", &LName);
fputs(&ch, out);

fclose(fp);
fclose(out);

}

[Hammer]

Please use code tags when posting code.

Here is your original code, with some modifications.

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

int main(void)
{
  FILE  *fp, *out;
  char  FName[100];
  char  LName[100];
  char  line[100];

  if ((fp = fopen("client.dat", "r")) == NULL)
  {
    printf("\nNo file opened.\n");
    return (EXIT_FAILURE);
  }

  if ((out = fopen("output.dat", "w")) == NULL)
  {
    printf("\nNo output file opened.");
    return (EXIT_FAILURE);
  }
  
  while (fgets(line, sizeof(line), fp)  != NULL)
  {
    sscanf(line, "%s%s", FName, LName);
    fprintf(out, "%s %s\n", LName, FName);
  }
  
  fclose(fp);
  fclose(out);
  
  return 0;
}

[Jasko989]

thanks alot