[C] File read/write operation

#include <iostream>
#include<stdio.h>


int main(){

    FILE *fp;
    int value = 0, rel = 0;

    //create new file with write mode
    fp = fopen("one.txt","w");

    printf("\n Enter the value to write: ");
    scanf("%d",&value);

    //writing value to file
    //putw(value, fp);
    fprintf(fp, "%d", value);

    //closing file from write mode
    fclose(fp);

    //opening file with read mode
    fp = fopen("one.txt","r");

    //reading value from file
    //rel = getw(fp);
    fscanf(fp, "%d", &value);

    printf("\n The result is:%d\n", value);

    //closing file from write mode
    fclose(fp);


    return 0;
}