Question

This little bit of C code is driving me nuts. It asks for the Input Voltage but then it skips Resistor 1 and asks for Resistor 2. I’m missing something extremely obvious here… What the heck is going on…

#include <stdio.h>
int main() 
{
    float Vin;
    int R1;  
    int R2;

    printf("Input Voltage: ");
    scanf("%.3f", &Vin);

    printf("\nResistor 1: ");
    scanf("%d", &R1);

    printf("\nResistor 2: ");
    scanf("%d", &R2);

    return(0);
}

Answer 1

Remove the .3 part:

scanf("%f", &Vin);

It does not really make sense to configure the number of decimal digits for input 🙂 Therefore, scanf does not support it. A float always has 8 decimal digits. Crank up your compiler’s warning levels.