How to generate random strings from a set of characters in C
main.c
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
void rand_string(char* str, int num) {
for (int i = 0; i < num; i++) {
str[i] = rand() % ('z' - 'a' + 1) + 'a';
}
str[num] = 0;
}
char random_characters[] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f', '+', '=', '-'
};
int random_characters_length = sizeof(random_characters) / sizeof(char);
void rand_string_2(char* str, int num) {
for (int i = 0; i < num; i++) {
str[i] = random_characters[rand() % random_characters_length];
}
str[num] = 0;
}
int main(int argc, char* argv[]) {
srand(time(NULL));
char str[16];
rand_string_2(str, 15);
printf("%s\n\n", str);
return 0;
}