- How to check whether a number is in the range of [min, max] using one comparison for both positive and negative numbers.

**Algorithm to check whether a number belongs to range [min, max]**

- If a number N is in range of [min, max](i.e min<=N<=max), then (N-min) should be >= 0 and (N-max) should be <= 0.
- Hence, if (N-min)*(N-max) <= 0 then N is in range of [min, max] otherwise out of range.
- Above solution will work for positive as well as negative numbers.

## C program to check whether a number is in given range.

#include<stdio.h> int main() { int num, min, max; printf("Enter an integer\n"); scanf("%d", &num); printf("Enter the minimum and maximum range\n"); scanf("%d %d", &min, &max); if((num-min)*(num-max) <= 0){ printf("%d is in range of [%d, %d]", num, min, max); } else { printf("%d is not in range of [%d, %d]", num, min, max); } return 0; }Output

Enter an integer 25 Enter the minimum and maximum range 10 40 25 is in range of [10, 40]

Enter an integer 50 Enter the minimum and maximum range 10 40 50 is not in range of [10, 40]