我是PHP新手。我正在开发一个在线考试系统。在HTML页面中，我安排了问题，为了选择答案，我使用了四个单选按钮作为4个选项。所有20个问题也是如此。现在这个问题是。我想从单选按钮中获得选定的值，我想将其存储在avariable中，我需要计算分数I。没有正确的选项。最后我想把它存储到数据库中。有人能给我做这件事的示例代码吗。。。这是我的html代码
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<font size=+1 color=blue><u><h1>C Language exam</h1></u></font><p>
<form method="POST" action="validate1.php">
<pre>
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1.In C, if you pass an array as an argument to a function, what actually gets passed?
<p>
<input type=radio name=1 value=a>A. Value of elements in array<br>
<input type=radio name=1 value=b>B. First element of the array<br>
<input type=radio name=1 value=c>C. Base address of the array<br>
<input type=radio name=1 value=d>D. Address of the last element of array<br>
2.How will you print 'n on the screen?<p>
<input type=radio name=2 value=a>A. printf("'n");<br>
<input type=radio name=2 value=b>B. echo "''n";<br>
<input type=radio name=2 value=c>C. printf(''n');<br>
<input type=radio name=2 value=d>D. printf("''n");<br>
3.C is what type of language?<p>
<input type=radio name=3 value=a>A. Low leval language<br>
<input type=radio name=3 value=b>B. high level language<br>
<input type=radio name=3 value=c>C. middle level language<br>
<input type=radio name=3 value=d>D. medium language<br>
4.Integer type char storage size.<p>
<input type=radio name=4 value=a>A. 2 bytes<br>
<input type=radio name=4 value=b>B. 1 byte<br>
<input type=radio name=4 value=c>C. 4 byte<br>
<input type=radio name=4 value=d>D. 8 bytes<br>
5.What is the output of given program
#include <stdio.h>
int main()
{ /* my first program in C */
printf("Hello, World! 'n");
return 0;
}<p>
<input type=radio name=5 value=a>A. first program<br>
<input type=radio name=5 value=b>B. world<br>
<input type=radio name=5 value=c>C. hello world<br>
<input type=radio name=5 value=d>D. hello<br>
6.How many times the program will print "welcome" ?
#include<stdio.h>
int main()
{
printf(“welcome”);
main();
return 0;
}<p>
<input type=radio name=6 value=a>A. Infinite times<br>
<input type=radio name=6 value=b>B. 32767 times<br>
<input type=radio name=6 value=c>C. 65535 times<br>
<input type=radio name=6 value=d>D. Till stack overflows<br>
7.Symbol of LOGICAL AND operation<p>
<input type=radio name=7 value=a>A. &<br>
<input type=radio name=7 value=b>B. &&<br>
<input type=radio name=7 value=c>C. ><br>
<input type=radio name=7 value=d>D. == <br>
8.What are the different types of real data type in C ?<p>
<input type=radio name=8 value=a>A. float, double<br>
<input type=radio name=8 value=b>B. short int, double, long int<br>
<input type=radio name=8 value=c>C. short int, double, long int<br>
<input type=radio name=8 value=d>D. double, long int, float<br>
9.Which statement will you add in the following program to work it correctly?
#include<stdio.h>
int main()
{
printf(“%f'n”, log(36.0));
return 0;
}<p>
<input type=radio name=9 value=a>A. #include<conio.h><br>
<input type=radio name=9 value=b>B. #include<math.h><br>
<input type=radio name=9 value=c>C. #include<stdlib.h><br>
<input type=radio name=9 value=d>D. #include<dos.h><br>
10.What will be the output of the program?
#include<stdio.h>
int main()
{
int i=-3, j=2, k=0, m;
m = ++i && ++j || ++k;
printf(“%d,%d,%d,%d'n”, i, j, k, m);
return 0;
}<p>
<input type=radio name=10 value=a>A. 1,2,0,1<br>
<input type=radio name=10 value=b>B. -3,2,0,1<br>
<input type=radio name=10 value=c>C. -2,3,0,1<br>
<input type=radio name=10 value=d>D. 2,3,1,1<br>
11.C closely associated with the which operating system?<p>
<input type=radio name=11 value=a>A. windows<br>
<input type=radio name=11 value=b>B. linux<br>
<input type=radio name=11 value=c>C. unix<br>
<input type=radio name=11 value=d>D. mac<br>
12.C was developed at Bell Laboratories in which year?<p>
<input type=radio name=12 value=a>A. 1943<br>
<input type=radio name=12 value=b>B. 1954<br>
<input type=radio name=12 value=c>C. 1972<br>
<input type=radio name=12 value=d>D. 1975<br>
13.In the following code, the P2 is Integer Pointer or Integer?
Typedef int *ptr;
ptr p1, p2;<p>
<input type=radio name=13 value=a>A. Integer<br>
<input type=radio name=13 value=b>B. Integer pointer<br>
<input type=radio name=13 value=c>C. Error in declaration<br>
<input type=radio name=13 value=d>D. None of above<br>
14.In the following code what is 'P'?
Typedef char *charp;
Const charp P;<p>
<input type=radio name=14 value=a>A. P is a constant<br>
<input type=radio name=14 value=b>B. P is a character constant<br>
<input type=radio name=14 value=c>C. P is character type<br>
<input type=radio name=14 value=d>D. None of above<br>
15.What is the similarity between a structure, union and enumeration?<p>
<input type=radio name=15 value=a>A. All of them let you define new values<br>
<input type=radio name=15 value=b>B. All of them let you define new data types<br>
<input type=radio name=15 value=c>C. All of them let you define new pointers<br>
<input type=radio name=15 value=d>D. All of them let you define new structures<br>
16.How will you free the allocated memory ?<p>
<input type=radio name=16 value=a>A. remove(var-name);<br>
<input type=radio name=16 value=b>B. free(var-name);<br>
<input type=radio name=16 value=c>C. delete(var-name);<br>
<input type=radio name=16 value=d>D. dalloc(var-name);<br>
17.Which header file should be included to use functions like malloc() and calloc()?<p>
<input type=radio name=17 value=a>A. memory.h<br>
<input type=radio name=17 value=b>B. stdlib.h<br>
<input type=radio name=17 value=c>C. string.h<br>
<input type=radio name=17 value=d>D. dos.h<br>
18.Specify the 2 library functions to dynamically allocate memory?<p>
<input type=radio name=18 value=a>A. Malloc() and memalloc()<br>
<input type=radio name=18 value=b>B. calloc() and memalloc()<br>
<input type=radio name=18 value=c>C. Malloc() and calloc()<br>
<input type=radio name=18 value=d>D. alloc() and calloc()<br>
19.What are the types of linkages?<p>
<input type=radio name=19 value=a>A. Internal and External<br>
<input type=radio name=19 value=b>B. External, Internal and None<br>
<input type=radio name=19 value=c>C. External and None<br>
<input type=radio name=19 value=d>D. Internal<br>
20.who created the new system's first higher-level language?<p>
<input type=radio name=20 value=a>A. McClure's<br>
<input type=radio name=20 value=b>B. McIlroy<br>
<input type=radio name=20 value=c>C. Thompson's <br>
<input type=radio name=20 value=d>D. Doug McIlroy<br>
<input type="submit" value="submit">
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</pre>
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从表单接收值
一般样本
$value = $_POST['name'];
适合您情况的特定代码
由于您有18个输入，全部以数字命名，因此您可以使用：
for($i=1;$i<19;$i++){
$value[$i] = $_POST[$i];
//$value[1] = $_POST['1']
}
检查值
一般样本
if($value=="correctanswer"){$correct++;}
适合您情况的特定代码
$correctanswer[1] = "correctanswer1"; //correct answer for input with name 1
$correctanswer[2] = "correctanswer2";
//Do this for every input
for($i=1;$i<19;$i++){
if($value[$i]==$correctanswer[$i]){$correct++;}
}
在数据库中存储$correct
假设您有一个名为"correct"的表，列为"number"：
$connect = mysqli_connect("localhost","root","","db");
if(!$connect){echo "Couldn't connect.";}
$query = "INSERT INTO correct(number) VALUES(".$correct.")";
$execute = mysqli_query($connect,$query);
if(!$execute){echo "Couldn't execute query. Please open PhpMyAdmin and try to execute the following query: <br>".$query." <br>. If it works, the problem is in the PHP code (or there was a temporary error); otherwise, there's a mistake in the query: please post it as a comment to my answer.";}