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Finally, other nonwhitespace characters in scanf calls must match
corresponding characters in the input; otherwise, reading stops. Two
percent signs are a special case; they must match a single percent sign in
the input:
int i, j;
scanf ("%i%% %i%%", &i, &j);
printf ("The total percentage is %i.\n", i + j);
--- Data ---
4% 16%
--- Result ---
The total percentage is 20.