#include <stdio.h>
int main() {
float x23 ;
float z_230 = 1e1;
float t_340 = 10.;
float oo=1./2*2*1/2;
const float loss = 6.28318/oo*1./4. ;
printf("%f %f %f \n",loss, z_230, t_340);
x23 = loss * z_230 * t_340;
printf("resultat = %f\n",x23);
}