#include <stdio.h>
#include <math.h>
/*
Math.Floor(x)
Rounds down toward −∞ (negative infinity)
Always goes to the next lower integer
Math.Truncate(x)
Removes the fractional part
Rounds toward zero (up)
*/
/*
Use Math.Floor() when:
* You want “round down” in the mathematical sense
* You’re computing ranges, bins, or intervals
* You want consistent behavior for negative values
Use Math.Truncate() when:
* You want to simply drop decimals
* You want symmetric behavior around zero
* You’re converting to an integer-like value without rounding
*/
void test(double x) {
double f = floor(x);
double t = trunc(x);
printf("x = %6.2f | floor = %6.2f | truncate = %6.2f\n", x, f, t);
}
int main()
{
test(5.9);
test(5.1);
test(1.0);
test(0.0);
test(-0.1);
test(-1.1);
test(-5.1);
test(-5.9);
test(-10.0);
return 0;
}
/*
run:
x = 5.90 | floor = 5.00 | truncate = 5.00
x = 5.10 | floor = 5.00 | truncate = 5.00
x = 1.00 | floor = 1.00 | truncate = 1.00
x = 0.00 | floor = 0.00 | truncate = 0.00
x = -0.10 | floor = -1.00 | truncate = -0.00
x = -1.10 | floor = -2.00 | truncate = -1.00
x = -5.10 | floor = -6.00 | truncate = -5.00
x = -5.90 | floor = -6.00 | truncate = -5.00
x = -10.00 | floor = -10.00 | truncate = -10.00
*/
