Question

How to generate 5 characters random string in C

Answer 1

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

void rand_string(char *str, size_t size) {
    const char charset[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    srand(time(0)); 
    
    for (int i = 0; i < size; i++) {
        str[i] = charset[rand() % (int) (sizeof charset - 1)];
    }
    str[size] = '\0';
}

int main(void) {
    char s[6] = "";
    
    rand_string(s, 5);

    puts(s);

    return 0;
}




/*
run:
  
BfcqJ
  
*/

 

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