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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. //prototypes
  5. double roomNumber();
  6. double phoneNumber();
  7. double creditCardNumber();
  8.  
  9.  
  10. int main(void) {
  11. 	int numberType = 3;
  12. 	printf("Enter 1 for room #, 2 for phone #, or 3 for credit card #");
  13. 	printf("\n");
  14. 	scanf(" %d", numberType);
  15. 	switch (numberType){
  16. 		case 1:
  17. 			printf("Try to memorize: %5.0lf\n", roomNumber());
  18. 			break;
  19. 		case 2:
  20. 			printf("Try to memorize: %11.0lf\n", phoneNumber());
  21. 			break;
  22. 		case 3:
  23. 			printf("Try to memorize: %17.0lf\n", creditCardNumber());
  24. 			break;
  25. 		default:
  26. 			printf("Sorry, we currently don't support that type\n");
  27. 			break;
  28. 	}
  29.  
  30. 	return 0;
  31. }
  32.  
  33. double roomNumber(){
  34. 	double randomness = (double)rand() / (double)RAND_MAX; //gives a random number between 0 and 1
  35. 	return randomness * 1e4;
  36. }
  37.  
  38. double phoneNumber(){
  39. 	double randomness = (double)rand() / (double)RAND_MAX; //gives a random number between 0 and 1
  40. 	return randomness * 1e10;
  41. }
  42.  
  43. double creditCardNumber(){
  44. 	double randomness = (double)rand() / (double)RAND_MAX; //gives a random number between 0 and 1
  45. 	return randomness * 1e16;
  46. }
  47.  
Success #stdin #stdout 0s 9432KB
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stdin
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Standard input is empty
stdout
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Enter 1 for room #, 2 for phone #, or 3 for credit card #
Try to memorize:  8401877171547095
https://ideone.com/CzUjpk
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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