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1. #include <stdio.h>
2. #include <stdlib.h>
3. 
   
4. void login(){
5. int passcode1;
6. int passcode2;
7. 
   
8. printf("enter passcode1 : ");
9. scanf("%d", passcode1);
10. fflush(stdin);
11. 
    
12. // ha! mommy told me that 32bit is vulnerable to bruteforcing :)
13. printf("enter passcode2 : ");
14.         scanf("%d", passcode2);
15. 
    
16. printf("checking...\n");
17. if(passcode1==338150 && passcode2==13371337){
18.                 printf("Login OK!\n");
19.                 system("/bin/cat flag");
20.         }
21.         else{
22.                 printf("Login Failed!\n");
23. exit(0);
24.         }
25. }
26. 
    
27. void welcome(){
28. char name[100];
29. printf("enter you name : ");
30. scanf("%100s", name);
31. printf("Welcome %s!\n", name);
32. }
33. 
    
34. int main(){
35. printf("Toddler's Secure Login System 1.0 beta.\n");
36. 
    
37. welcome();
38. login();
39. 
    
40. // something after login...
41. printf("Now I can safely trust you that you have credential :)\n");
42. return 0;

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1. printf("enter passcode1 : ");
2. scanf("%d", passcode1);

1. printf("enter passcode1 : ");
2. scanf("%d", passcode1);
3. fflush(stdin);

-got