One-Line C Function to Round Floating Point Numbers

Here we will see how to write one-line C function, that can round floating point numbers. To solve this problem, we have to follow these steps.

• Take the number
• if the number is positive, then add 0.5
• Otherwise, subtract 0.5
• Convert the floating point value to an integer using typecasting

Example

#include <stdio.h>
   int my_round(float number) {
   return (int) (number < 0 ? number - 0.5 : number + 0.5);
}
int main () {
   printf("Rounding of (2.48): %d
", my_round(2.48));
   printf("Rounding of (-5.79): %d
",my_round(-5.79));
}

Output

Rounding of (2.48): 2
Rounding of (-5.79): -6