Question

4.1 [2 pts. int rollO Define a function roll() that takes no arguments, and returns a random integer from 1 to 6. Before proceeding further, we recommend you write a short main method to test it out and make sure it gives you the right values. Comment this main out after you are satisfied that roll() works. Remenber:texibook Seciion 49 is on randormness, and Chapier 5is on functions. int getKandomNumber return 4 l chosen by fair dice roll. ll guaranteed to be random. HTTP:/IXKCD.COM/221 (NOTE: THIS FUNCTION IS A JoKE...DON'T USE IT)

Thank you!!!

Answer 1

Code

-----------------------

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

int roll()
{
return rand()%5+1;
}

void printHistogram(int counts[21])
{
for (int i=0; i<21; i++)
{
printf("\n%d:",i+4);
for (int j =0 ; j<counts[i]; j++)
{
printf("X");
}
}
}

int main()
{
int i, n, r1, r2, r3, r4;
printf("How many rolls do you want? ");
scanf("%d",n);
int testCounts[21] = {0};
for(i=0; i<n; i++)
{
r1 = roll();
r2 = roll();
r3 = roll();
r4 = roll();
int total = r1+r2+r3+r4;
printf("%d ",total);
testCounts[total-4] += 1;
}
printHistogram(testCounts);
return 0;
}

Output

-----------------

How many rolls do you want? 50
4:
5:
6:
7:XX
8:XXXXX
9:X
10:XXXXX
11:XXXXXXXXXXX
12:XXXX
13:XXXXXX
14:XXXXXX
15:XXXX
16:XXX
17:X
18:X
19:
20:X
21:
22:
23:
24: