note: may contain errors
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46 | <!doctype html>
<html>
<head>
<title>Sammy's Readings</title>
</head>
<body>
<div style="text-align: center">
<h1>Sammy's readings</h1>
</div>
<p>
Please select books from the table of currently available
books. Each book is displayed with a description and cost. On the right side you can
select the quantity of books you would like to purchase. Leaving the number at zero to
indicate that you do not want that book. Enjoy!
</p>
<form action="bill.py" method="POST">
<table>
<thead>
<tr style="background-color: #CCCCCC">
<th>Title</th>
<th>Description</th>
<th>Price</th>
<th>Qty</th>
</tr>
</thead>
<tbody>
<tr>
<td>foo</td>
<td>bar</td>
<td>10.00</td>
<td><input type="text" name="foo" value="0" /></td>
</tr>
<tr>
<td>foo1</td>
<td>bar2</td>
<td>10.00</td>
<td><input type="text" name="foo1" value="0" /></td>
</tr>
</tbody>
</table>
<div style="text-align: center">
<input type="submit" value="Purchase!" name="submit" />
</div>
</form>
</body>
</html>
|
Made the following changes:
- XHTML for the input tags (<input /> instead of <input>)
- Got rid of ugly ugly <center> tags (preferrably, you would center them in the CSS, but, baby steps)
- Made use of <thead>, <tbody>, and <th>
- Made use of <h1> for the header
- Some indentation changes for clarity
- Added a name attribute to the submit button
- Enclosed the value of the "value" attribute in quotation marks
@dellsystem
@alexangelini
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29 | #!/usr/bin/env python
import cgi
print "Content-type: text/html"
print ""
print """
<html>
<head><title>Sammy's Readings</title></head>
<body>
<center><span style="font-size:16px">Sammy's Readings</span></center>
"""
prices = {}
total = 0
f = open("products.csv")
for line in f:
prices[f.split(",")[0]] = f.split(",")[1]
for item in cgi.FieldStorage.keys():
quantity = int(cgi.FieldStorage[item])
if quantity == 0:
continue # keeps looping; not the same as pass
price = quantity * float(prices[item])
total += quantity * price
print "%s x %d at %s each: %f <br>" %(item, quantity, prices[item], price)
print total * 1.10
print """
</body>
</html>
"""
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20 | #include <stdio.h>
int factorial(int n){
int s = 1;
for(;n>0;n--)
s*=n;
return s;
}
void main(char * args[]){
int n = 0;
int total = 0;
for(;;){
printf("Enter an integer greater or equal to zero: \n");
scanf("%d",&n);
if(n<0)
break;
total+=factorial(n);
}
printf("Sum = %d", total);
}
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34 | #include <stdio.h>
#include <stdlib.h>
BOOLEAN insort(int x){
//empty list
if(head == NULL){
head = (NODE*) malloc(sizeof(NODE));
if(!head) return 1; //malloc fail
head->value = x;
return 0; //success
}
int curVal = head->value;
NODE* curNode = head;
if(head -> value > x){
NODE newHead = (NODE*)malloc(sizeof(NODE));
if(!newHead) return 1; //malloc fail
newHead->value = x;
newHead->next = head;
head->next = NULL;
head = newHead;
return 0; //success
}
else{
while(curNode < x && curNode->next != NULL && curNode->next->value < x){
curNode = curNode -> next;
}
NODE newNode = (NODE*)malloc(sizeof(NODE));
if(!newNode) return 1; //malloc fail
newNode->value = x;
newNode->next = curNode->next;
curNode->next = newNode;
return 0; //success
}
}
|
- In the second if statement, why do you set head->next to NULL? Doesn't that disconnect the rest of the list from newHead and Head?
@s3admq
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22 | all: myprogram
myprogram: f1.o f2.o f3.o
gcc f1.o f2.o f3.o -o myprogram
f1.o: f1.c
gcc -c f1.c
f2.o: f1.c
gcc -c f2.c
f3.o: f1.c
gcc -c f3.c
clean:
rm -rf *.o a.out
backup:
mkdir backup && cp *.* ./backup
archive:
tar -rvf myprogram.tar myprogram *.dat
|
a. The end result would be the sum of all 100000 numbers in the file
b. The advantage is that it benefits from parallelization which means it can take advantage of multiple processors
c. If fork does not succeed it means the system doesn't have enough resources to fork, thus we should try to compute it in a single process instead
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28 | int main(void)
{
FILE *in = fopen("data.txt","rt");
int j, s=0;
int id1, id2;
if (in == NULL) exit(EXIT_FAILURE);
for(j=0;j<100000;j++) fscanf(in,"%d",&array[j]);
fclose(in);
id1=fork();
if(id1<0){//fork failed
s1 = doit(0,50000);
s2 = doit(50001,100000);
}
else if (id1 != 0){
id2=fork();
if(id2<0){//fork failed
s2 = doit(50001,100000);
}
else if (id2 != 0) wait(0); // waits for all children to finish
else s2 = doit(50001,100000);
} else s1 = doit(0,50000);
if (id1 != 0 && id2 != 0){
s = s1 + s2;
printf("s = %d\n", s);
return EXIT_SUCCESS;
}
return EXIT_SUCCESS;
}
|
