Question

How to pick random index from an array with C

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(void) {
	int arr[] = { 4, 9, 12, 90, 13, 0, 3, 97 };

	int size = sizeof(arr) / sizeof(arr[0]);

	srand(time(NULL));

	printf("%d", rand() % (size - 1)); // random from 0 to size - 1

	return 0;
}



/*
run:
 
6
 
*/

 

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