47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
|
/*
|
||
|
|
* Author: Simon Schurti
|
||
|
|
*
|
||
|
|
* Licence: MIT
|
||
|
|
*
|
||
|
|
* Informatik 1 exercice:
|
||
|
|
* Takes user input for Voltage and Current in V/A respectively.
|
||
|
|
* calculates and prints Power and Resistance
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
int main() {
|
||
|
|
double u, i, p, r; // Voltage , current, power, resistance
|
||
|
|
while (1) {
|
||
|
|
printf("To Terminate enter anything that is not a valid float.\n\n");
|
||
|
|
|
||
|
|
// fscanf returns bytes scanned, so if ret is 0 no float was detected
|
||
|
|
// fscanf only matches %lf, so "123 asdlkj" would be valid input according
|
||
|
|
// to format specified in fscanf. getc pops next byte from stdin, which is
|
||
|
|
// always \n if user input is valid
|
||
|
|
printf("Voltage[V]: ");
|
||
|
|
int ret = fscanf(stdin, "%lf", &u); // read voltage from user
|
||
|
|
if (ret <= 0 || getc(stdin) != '\n')
|
||
|
|
break; // terminate if user input is invalid
|
||
|
|
printf("Current[A]: ");
|
||
|
|
ret = fscanf(stdin, "%lf", &i); // read current form user
|
||
|
|
if (ret <= 0 || getc(stdin) != '\n')
|
||
|
|
break; // termainte if user input is invalnid
|
||
|
|
|
||
|
|
// power [W] = current [A] * voltage[V]
|
||
|
|
p = i * u;
|
||
|
|
|
||
|
|
// resistance[Ohm] = voltage[V] / current[A]
|
||
|
|
if (i != 0) {
|
||
|
|
r = u / i;
|
||
|
|
printf("Resistance[Ohm]: %.3lf\n", r);
|
||
|
|
printf("Power[W]: %.3lf\n", p);
|
||
|
|
printf("Resistance %.3lf is %s than Power %.3lf\n", r,
|
||
|
|
(r > p) ? "greater" : "smaller", p);
|
||
|
|
} else {
|
||
|
|
printf("No current is flowing. Resistance cannot be "
|
||
|
|
"calculated\nPower: 0 W\n");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|