use ceil() function.
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import 'dart:convert';
void main() {
//positive number
print("The value of (1.5).ceil(): ${(1.5).ceil()} ");
// negative number
print("The value of (-5.5).ceil(): ${(-5.5).ceil()} ");
//zero
print("The value of (0).ceil(): ${(0).ceil()}");
}
OUTPUT:
The value of (1.5).ceil(): 2
The value of (-5.5).ceil(): -5
The value of (0).ceil(): 0