hdoj 1002,c语言，测试数据通过，但是wa

Problem Description
I have a very simple problem for you. Given two integers A and B, your job is to calculate the Sum of A + B.

Input
The first line of the input contains an integer T(1<=T<=20) which means the number of test cases. Then T lines follow, each line consists of two positive integers, A and B. Notice that the integers are very large, that means you should not process them by using 32-bit integer. You may assume the length of each integer will not exceed 1000.

Output
For each test case, you should output two lines. The first line is "Case #:", # means the number of the test case. The second line is the an equation "A + B = Sum", Sum means the result of A + B. Note there are some spaces int the equation. Output a blank line between two test cases.

Sample Input
2
1 2
112233445566778899 998877665544332211

Sample Output
Case 1:
1 + 2 = 3

Case 2:
112233445566778899 + 998877665544332211 = 1111111111111111110

`````` #include<stdio.h>

int main()
{
int n;
scanf("%d",&n);
long long i=0,a,b;
for(i=0;i<n;i++)
{
scanf("%lld %lld",&a[i],&b[i]);
}
for(i=0;i<n;i++)
{
printf("Case %d:\n%lld + %lld = %lld\n",i+1,a[i],b[i],a[i]+b[i]);
if(i!=n-1)
printf("\n");
}
return 0;
}
``````

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