如何混合C中的輸出字符？

Question

舉例來說，我的輸出是：thwhglHDGQYE836

有沒有辦法讓它變成輸出？如果有辦法，一些建議會很好謝謝:)。

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

int main(void) { 
    int i; 
    char c; 

    srand(time(NULL)); 
    printf("Your Random Password is: "); 
    for (i = 0; i < 6; ++i) { 
     c = 'a' + rand() % ('z' - 'a' + 1); 
     printf("%c", c); 
    } 
    for (i = 0; i < 6; ++i) { 
     c = 'A' + rand() % ('Z' - 'A' + 1); 
     printf("%c", c); 
    } 
    for (i = 0; i < 3; ++i) { 
     c = '1' + rand() % ('1' - '9' + 1); 
     printf("%c", c); 
    } 

    printf("\n\n"); 
    system("pause"); 
} 

Answer 1

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

int main(void) { 
    char password[6 + 6 + 3 + 1]; 
    int i, j=0, len=sizeof(password)-1; 

    srand(time(NULL)); 
    printf("Your Random Password is: "); 
    for (i = 0; i < 6; ++i) 
     password[j++] = 'a' + rand() % ('z' - 'a' + 1); 
    for (i = 0; i < 6; ++i) 
     password[j++] = 'A' + rand() % ('Z' - 'A' + 1); 
    for (i = 0; i < 3; ++i) 
     password[j++] = '1' + rand() % ('1' - '9' + 1); 
    password[j] = '\0'; 
    for(i = 0; i < sizeof(password)-1; ++i) 
     { 
     char c = password[i]; 
     j = rand() % len; 
     password[i] = password[j]; 
     password[j] = c; 
     } 
    printf("%s\n\n", password); 
    system("pause"); 
}