#include <cstdio> //corrected
int x=1, y=3, z=7;
void duplicate (int a, int b, int c)
{
a=a*2;
b=b*2;
c=c*2;
}
int main ()
{
duplicate (x, y, z);
printf("The answer is %i and %i and %i",x,y,z);
return 0;
}
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