printf("%.0f "，s)

%f outputs 6 decimal places by default, and the way to customize decimal places is% x.yf

X is the number of digits in the integer part. If it is insufficient, put a space before it. Y is the number of digits in the decimal part. xy is a positive integer, separated by dots.

There is also a cast to int type.

printf("%d "，(int)s)；