Your statement and example under "Rounding Numbers with sprintf()" is incorrect and misleading. Using "%d" does NOT round a float as necessary, it merely truncates everything after the decimal. Thus,
printf("%d", 3.99); # will print 3, not 4.
# To properly 'round a float as necessary':
printf("%.0f", 3.49); # This will print 3
printf("%.0f", 3.51); # This will print 4
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