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#include <stdio.h>
#include <stdlib.h>
int main(void)
{
double number;
while (scanf("%lf", &number) != 1)
{
printf("Error\n");

...

Look at the following data file（cou.data） which has four fields separated by tab.

Four fields are country name, land area, population, continent where it belongs.

As for country name or...