Question

How to generate 4 digits random numbers in C

Answer 1

#include <stdio.h>
#include <stdlib.h> 
#include <time.h> 
 
int getRandom(int lower, int upper) { 
	return rand() % (upper - lower + 1) + lower; 
} 
 
int main()
{
	srand(time(0)); 
	 
	for (int i = 0; i < 10; i++)
		printf("%d\n", getRandom(1000, 9999));
      
    return 0;
}
 
 
 
/*
run:
 
6275
4675
6392
4198
2545
9283
5203
9172
3706
4913
   
*/

 

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Answer 2

#include <stdio.h>
#include <stdlib.h> 
#include <time.h> 
 
int main()
{
	srand(time(0)); 
	 
	for (int i = 0; i < 10; i++)
		printf("%d\n", 1000 + (rand() % 9000));
      
    return 0;
}
 
 
 
/*
run:
 
6637
3332
8467
6250
9583
4398
8237
2924
1485
1606
   
*/

 

 

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