Question

How to select random two consecutive digits from a number in C

Answer 1

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

// Function to get random two consecutive digits from a number
void getRandomTwoDigits(int num, char *out) {
    char s[16];  // buffer to hold number as string
    sprintf(s, "%d", num);

    int len = strlen(s);

    if (len < 2) {
        strcpy(out, "Err");  // not enough digits
        return;
    }

    int start = rand() % (len - 1);

    strncpy(out, s + start, 2);
    out[2] = '\0';
}

int main(void) {
    srand((unsigned)time(NULL)); 

    int num = 123456;  
    char randomTwo[3]; 

    getRandomTwoDigits(num, randomTwo);

    printf("Random two digits: %s\n", randomTwo);

    return 0;
}


   
/* 
run:
   
Random two digits: 23
 
*/

 

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