Write a C program not C not C that reads numbers from a text

Write a C program, not C++, not C#, that reads numbers from a text file, sorts the numbers in ascending order, and finally writes the sorted numbers in another file. Text document to be read from, has different numbers on each line, like a column. Any help would be greatly appreciated.

Solution

#include <stdio.h>   
#include <conio.h>
#include <stdlib.h>
int main(int argc,char *argv[])
{   
FILE *f1, *f2, *f3;
int number, i,n;
   int arr[20];
printf(\"enter number of data elements\ \");
   scanf(\"%d\", &n);
printf(\"create Contents of file\ please enter data to the file:\ \");
f1 = fopen(\"contents\", \"w\"); /* Create DATA file */
i=0;
   while(i < n){
scanf(\"%d\", &number);
putw(number,f1);
       i++;
}   
fclose(f1);   

f1 = fopen(\"contents\", \"r\");
   f2 = fopen(\"result\",\"w\");
i=0;
while(i<n)
{
scanf(\"%d\",&arr[i]);
i++;
}   
int j;
for(i=0;i<n;i++){
    for(j=0;j<n;j++){
        if(arr[i] >= arr[j]){
           int temp = arr[i];
           arr[i]= arr[j];
           arr[j] = temp;
           }
       }
   }
   printf(\"\ \ Contents of the file\ \ \");   
for(i=0;i<n;i++)
          printf(\"%d\\t\",arr[i]);
  
return 0;
}