Generating random number in a range in C
How to generate a random number in a given range in C. Examples:
Input : Lower = 50,
Upper = 100,
Count of random Number = 5
Output : 91 34 21 88 29
Explanation: lower is the lower limit of the
range and upper is the upper limit of the range.
Output contains 5 random numbers in given range.
C does not have an inbuilt function for generating a number in the range, but it does have rand function which generates a random number from 0 to RAND_MAX. With the help of rand () a number in range can be generated as num = (rand() % (upper – lower + 1)) + lower
C
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
void printRandoms( int lower, int upper,
int count)
{
int i;
for (i = 0; i < count; i++) {
int num = ( rand () %
(upper - lower + 1)) + lower;
printf ( "%d " , num);
}
}
int main()
{
int lower = 5, upper = 7, count = 1;
srand ( time (0));
printRandoms(lower, upper, count);
return 0;
}
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Time complexity: O(N) where N is the count of random numbers to be generated
Auxiliary Space: O(1)
Note: Output generated on each run may be different because the number is generated randomly.
Last Updated :
24 Aug, 2022
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