Question

How to generate 3 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 < 20; i++)
        printf("%d\n", getRandom(100, 999));
       
    return 0;
}
  
  
  
/*
run:
  
523
417
930
303
293
276
864
862
219
322
216
748
851
849
582
923
478
182
359
701
    
*/

 

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Answer 2

#include <stdio.h>
#include <stdlib.h> 
#include <time.h> 
  
int main()
{
    srand(time(NULL)); 

    for (int i = 0; i < 20; i++) {
		printf("%d\n", 100 + (rand() % 900));
	}
       
    return 0;
}
  
  
  
/*
run:
  
754
353
124
808
630
402
428
337
176
180
222
777
572
812
679
943
558
872
286
100
    
*/

 

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