Resistance Calculator

//Resistance Calculator
//Adam Robbins 2011

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

float v,i,r;                                                        //set up various variables
char vin[256];
char iin[256];

int main()
{
    printf("What is the Voltage?\n");                               //ask for the voltage
    scanf("%s",&vin);                                               //read the input
    v = atof(&vin);                                                 //convert to floats
    printf("\nWhat is the Current?\n");                             //ask for the current
    scanf("%s",&iin);                                               //read the input
    i = atof(&iin);                                                 //convert to floats

    r = v / i;                                                      //do the sum

    printf("\n\nThen the Resistance must be... %f\n\n",r);          //print the answer

    return 0;                                                       //stop moaning and shut up
}