bridge voltage calculator in C from command line

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Robin Clark 2019-07-02 09:41:18 +01:00 committed by GitHub
parent 5482512db6
commit 831d3e5a14
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bridge_v.c Normal file
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#include <stdio.h>
#include <stdlib.h>
// compile on linux as
// gcc -o br bridge_v.c
//
// run as
// ./br 10 10 10 10.1
//
int main(int argc, char **argv)
{
double r1, r2, r3, r4;
double v = 5.0;
if (argc != 5) {
printf(" usage: %s R1 R2 R3 R4 \n", argv[0]);
printf(" usage: resistances in k Ohm\n" );
} else {
r1 = atof(argv[1])*1000.0;
r2 = atof(argv[2])*1000.0;
r3 = atof(argv[3])*1000.0;
r4 = atof(argv[4])*1000.0;
printf(" Voltage diff == %f\n", v * (r2 * r3 - r1 * r4) / ((r1 + r3) * (r2 + r4)));
}
}