#include <stdio.h>
void reset ();
void sum (double v);
void subtract (double v);
double current_value;
int main (){
reset();
sum(5);
sum(27);
subtract(4);
printf("current value = %5.3f\n", current_value
); return 0;
}
void reset() {current_value = 0;}
void sum (double v) { current_value += v;}
void subtract (double v) { current_value -= v;}
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