This code will print a “random” value - PowerPoint Presentation

1. This code will print a “random” valuebetween what and what?#include <stdio.h>#include <stdlib.h>int main(){ int temp; temp = rand()%6; printf("temp=%d", temp);}1. Between 1 and 62. Between 0 and 53. Between 0 and 64. Between 1 and 5

2. What is a reasonable output for this code?#include <stdio.h>#include <stdlib.h>int main(){ int temp, counter = 0; while (counter <= 5) { temp = rand()%6; printf("temp=%d\n", temp); counter++; }}1. temp=1 temp=4 temp=3 temp=1 temp=5 temp=12. temp=0 temp=4 temp=7 temp=1 temp=5 temp=13. temp=-1 temp=4 temp=3 temp=1 temp=5 temp=14. temp=-1 temp=4 temp=3 temp=10 temp=5 temp=1

3. If you ran this code multiple times would you get the same answer?#include <stdio.h>#include <stdlib.h>int main(){ int temp, counter = 0; while (counter <= 5) { temp = rand()%6; printf("temp=%d\n", temp); counter++; }}YES! Because rand is “pseudorandom” – it needs a different seed number every time to be more random

4. Will these two pieces of code have the same output?#include <stdio.h>#include <stdlib.h>int main(){ int temp, counter = 0; srand(98); /* seed rand */ while (counter <= 5) { temp = rand()%6; printf("temp=%d\n", temp); counter++; }}#include <stdio.h>#include <stdlib.h>int main(){ int temp, counter = 0; srand(198); /* seed rand */ while (counter <= 5) { temp = rand()%6; printf("temp=%d\n", temp); counter++; }}NO! Different seed numbers.

5. Will these two pieces of code have the same output?#include <stdio.h>#include <stdlib.h>int main(){ int temp, counter = 0; srand(98); /* seed rand */ while (counter <= 5) { temp = rand()%6; printf("temp=%d\n", temp); counter++; }}#include <stdio.h>#include <stdlib.h>int main(){ int temp, counter = 0; srand(98); /* seed rand */ while (counter <= 5) { temp = rand()%6; printf("temp=%d\n", temp); counter++; }}Yes! Same seed numbers.

6. Will this code give me the same ouput if I ran it at 10am versus noon?#include <stdio.h>#include <stdlib.h>#include <time.h>int main(){ int temp, counter = 0; srand(time(NULL)); /* seed with time */ while (counter <=10) { temp = rand()%6; printf("temp=%d\n", temp); counter++; }}It will give you different output because I am seeding it with time.

7. Do these two codes doing the same thing?#include <stdio.h>#include <stdlib.h>#include <time.h>int main(){ int temp, counter = 0; srand(time(NULL)); while (counter <=10) { temp = rand()%6; printf("temp=%d\n", temp); counter++; }}Yes, the one on the right is just using a function.#include <stdio.h>#include <stdlib.h>#include <time.h>int silly(void);int main(){ int temp, counter = 0; srand(time(NULL)); while (counter <=10) { printf("temp=%d\n", silly()); counter++; }}int silly(void){ return rand()%6;}

8. Keepin’ ya on your toes…What is the output?#include <stdio.h>#include <stdlib.h>#include <time.h>#define TRUE 1#define FALSE 0int main(){ int temp, counter = 0, loop=TRUE; srand(time(NULL)); while (loop) { printf("temp=%d\n", rand()%6); counter++; if (counter == 5) { loop = FALSE; } }}1. temp=3 temp=1 temp=0 temp=5 temp=02. temp=0 temp=4 temp=7 temp=1 temp=5 temp=13. temp=-1 temp=4 temp=3 temp=1 temp=5 temp=14. Never ends

9. Something you can mull over?#include <stdio.h>#define FALSE 0#define TRUE 1#include "boolean.h"int main(void) { int num1, num2; boolean result; printf("Input 2 numbers "); scanf("%d %d", &num1, &num2); if (isMultiple(num1, num2)) { printf("They are multiples\n"); } else { printf("Not multiples\n"); }}/* Define a type called boolean as an int */#define boolean int/* Define the prototype */boolean isMultiple(int a, int b);/* The function code */boolean isMultiple(int a, int b) { int answer; if (a % b == 0) { answer = TRUE; } else { answer = FALSE; } return answer;}Program.cboolean.h