
很简单利用C语言中的动态数组就可以搞定
举个例子
#include <stdio.h>#include <stdlib.h>
#include <malloc.h>
#include <time.h>
int main()
{
srand((unsigned)time(NULL))
int n
int new_number
printf("please input a number:\n")
scanf("%d",&n)
int *p = (int *)malloc(n*sizeof(int))
for (int i=0i<ni++)
{
p[i] = rand()%100
}
printf("the array is:\n")
for (int i=0i<ni++)
{
printf("%d\t",p[i])
}
printf("add a new number to array:\n")
scanf("%d",&new_number)
int *q = (int *)realloc(p,(n+1)*sizeof(int))
q[n] = new_number
printf("after add a new number the array is:\n")
for (int i=0i<n+1i++)
{
printf("%d\t",q[i])
}
free(q)
system("pause")
return 0
}
通过动态数组就可以在原本已经满的数组后面继续添加元素
js动态添加数组可以按下面的步骤:
1、在数组的开头添加新元素 - unshift()
源代码:
<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button to add elements to the array.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var fruits = ["Banana", "Orange", "Apple", "Mango"]
fruits.unshift("Lemon","Pineapple")
var x=document.getElementById("demo")
x.innerHTML=fruits
}
</script>
<p><b>Note:</b>The unshift() method does not work properly in Internet Explorer 8 and earlier, the values will be inserted, but the return value will be <em>undefined</em>.</p>
</body>
</html>
测试结果:
Lemon,Pineapple,Banana,Orange,Apple,Mango
2、在数组的第2位置添加一个元素 - splice()
源代码:
<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button to add elements to the array.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var fruits = ["Banana", "Orange", "Apple", "Mango"]
fruits.splice(2,0,"Lemon","Kiwi")
var x=document.getElementById("demo")
x.innerHTML=fruits
}
</script>
</body>
</html>
测试结果:
Banana,Orange,Lemon,Kiwi,Apple,Mango
3、数组的末尾添加新的元素 - push()
源代码:
<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button to add a new element to the array.</p>
<button onclick="myFunction()">Try it</button>
<script>
var fruits = ["Banana", "Orange", "Apple", "Mango"]
function myFunction()
{
fruits.push("Kiwi")
var x=document.getElementById("demo")
x.innerHTML=fruits
}
</script>
</body>
</html>
测试结果:
Banana,Orange,Apple,Mango,Kiwi
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