find the numbers of pairs whose sum is 10 in c array

1#include <stdio.h>
2void main ()
3{
4    int a[10];
5    int i,j;
6
7    for (i=0;i<10;i++)
8    {
9        printf("Enter %d number: ",i+1);
10        scanf("%d",&a[i]);
11    }
12
13    int count=0;
14
15    for (i = 0; i < 10; ++i)
16    {
17        for(j=i+1;j<10;j++)
18        {
19            if (a[i] + a[j] == 10)
20                count++;
21        }
22    }
23
24    printf("The number of pairs that have sum of 10 is %d",count);
25}