c program to print sum of integers into text file

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#include <stdio.h>

int main(void) {

  // creating a FILE variable

  FILE *fptr;

  

  // integer variable

  int num;

  

  // open the file in write mode

  fptr = fopen("integers", "w");

  

  if (fptr != NULL) {

    printf("File created successfully!\n");

  }

  else {

    printf("Failed to create the file.\n");

    // exit status for OS that an error occurred

    return -1;

  }

  

  // enter integer numbers

  printf("Enter some integer numbers [Enter -1 to exit]: ");

  while (1) {

    scanf("%d", &num);

    if (num != -1) {

      putw(num, fptr);

    }

    else {

      break;

    }

  }

  

  // close connection

  fclose(fptr);

  

  // open file for reading

  fptr = fopen("integers", "r");

  

  // display numbers

  printf("\nNumbers:\n");

  while ( (num = getw(fptr)) != EOF ) {

    printf("%d\n", num);

  }

  

  printf("\nEnd of file.\n");

  

  // close connection

  fclose(fptr);

  

  return 0;

}