Question

How to generate random lowercase letters in C

Answer 1

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

char GetRandomLowercaseLetter(void);
 
int main(void)
{   
    srand((unsigned)time(NULL));
    
    for (int i = 0; i < 10; i++)
          printf("%c ", GetRandomLowercaseLetter());
     
    return 0;
}
char GetRandomLowercaseLetter(void)
{
    int n = rand() % 26; // 0 - 25
    char ch = (char)('a' + n);
 
    return ch;
}
 
       
/*
run:
    
n u u o i e d r p v
  
*/

 

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Answer 2

#include <stdio.h> 
#include <time.h> 
#include <stdlib.h> 
 
char GetRandomLowercaseLetter(void);
  
int main(void)
{   
    srand((unsigned)time(NULL));
     
    for (int i = 0; i < 10; i++)
          printf("%c ", GetRandomLowercaseLetter());
      
    return 0;
}
char GetRandomLowercaseLetter(void)
{
    return 'a' + (rand() % 26);
}
  
        
/*
run:
     
t c y o n q j i q i
   
*/

 

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Answer 3

#include <stdio.h> 
#include <time.h> 
#include <stdlib.h> 
 
char GetRandomLowercaseLetter(void);
  
int main(void)
{   
    srand((unsigned)time(NULL));
     
    for (int i = 0; i < 10; i++)
          printf("%c ", GetRandomLowercaseLetter());
      
    return 0;
}
char GetRandomLowercaseLetter(void)
{
    return "abcdefghijklmnopqrstuvwxyz"[rand() % 26];
}
  
        
/*
run:
     
j b j p x c y x e f
   
*/

 

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Answer 4

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

char* random_lowercase_letters(int len) {
    char* result = malloc((len + 1) * sizeof(char));
    static const char alphabet[] = "abcdefghijklmnopqrstuvwxyz";
    
    for (int i = 0; i < len; i++) {
        int index = rand() % (sizeof(alphabet) - 1);
        result[i] = alphabet[index];
    }
    
    result[len] = '\0';
    
    return result;
}

int main() {
    srand(time(NULL));
    
    char* random = random_lowercase_letters(7);
    
    printf("%s\n", random);
    
    free(random);
    
    return 0;
}




 
/*
run:
   
aantzbx
 
*/

 

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