Improved code. Previous version went against the POSIX convention.
# Following the POSIX convention,
# halfway cases are rounded away from zero,
# to the extent this is possible given the inherent
# inexactitude of the floating-point representation.
round = func(arg, quantum=1){
if (quantum == 0) {
return arg;
}
if (quantum < 0) {
quantum = -quantum;
}
sign = 1;
if (arg < 0) {
arg = -arg;
sign = -sign;
}
return sign * quantum * int(0.5 + arg/quantum);
}
print(0.5, " -> ", round(0.5), " should be 1");
print(-0.5, " -> ", round(-0.5), " should be -1");
print(120.37, " -> ", round(120.37, 0.025), " should be 120.375");
Result:
0.5 -> 1 should be 1
-0.5 -> -1 should be -1
120.3699999999999 -> 120.375 should be 120.375
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