Question

Write a c program.

CH-12 has arbitrary number of lines and one num. txt EXERCISE 12-11 te a program to create a new file numnew. txt that will he ine. A text file will have number in reverse order of the file num.txt For example: M the num.txt file is 7632 582 13101 then the numnew. txt file will be 1367 285 10131

Answer 1

#include <stdio.h>

#include<stdlib.h>
int main(void) {
// creating a FILE variable
FILE *fptr;
FILE *wptr;
  
// integer variable
int numb,r,s=0;
char ch;
// open file for reading
fptr = fopen("D:/num.txt", "r");
//fail to open the file
if(fptr==NULL)
{
printf("\n Unable toopen the source file");
exit(0);
}

//open a file for writing
wptr = fopen("D:/numnew.txt", "w+");
//fail to open the file
if(fptr==NULL)
{
printf("\n Unable toopen the target file");
fclose(fptr);
exit(0);
}
//read data from num.txt
while (fscanf(fptr, "%d", &numb)!=EOF)
{
   
//reverse the number
s=0;
while(numb>0)
    {
       r=numb%10;
       s=s*10+r;
       numb=numb/10;
   }
  
//write the reverse number into file
fprintf(wptr, "%d\n", s);
}

  
// close connection
fclose(fptr);
fclose(wptr);
  
  
}

INPUT

num.txt

num Notepad File Edit Format View Help 352 569 845 2635 12 85 784 253 132 105

output file

numnew.txt

numnew Notepad File Edit Format View Help 253 965 548 5362 21 58 487 352 231 501