#include <stdio.h>
double ReadNext(FILE *file, double def)
{
double x = def;
fscanf(file
, "%lf%*[^\n] ", &x
); return x;
}
int main(void)
{
int i;
for(i=0;i<7;++i)
{
printf("%lf\n",ReadNext
(stdin
,0)); }
return 0;
}
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