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i am trying out merge sort.

i have made two functions sort and merge;

i am calling merge recursively.

i think my sort function is working fine. the problem lies with merge function.

in merge function i am dividing the array using recursive calls. it ends when lb = = ub(ie lower bound equals upper bound). lower bound and upper bound are index of array.

then i am passing it to sort function function.

suggest me a solution of correction to merge sort.

```
#include<iostream>
//#include<stream>
using namespace std;
int A[7] = {3,4,77,10,2,5,7};
void sort(int l1,int u1,int l2,int u2)
{
int B[7];
int i=l1;
int j=l2;
int k=0;
while(i<=u1&&j<=u2) {
if(A[i]<A[j]) {
B[k] = A[i];
i++;
k++;
}
else {
B[k] = A[j];
j++;
k++;
}
}
while(j<=u2) {
B[k]=A[j];
j++;
k++;
}
while(i<=u1) {
B[k] = A[i];
i++;
k++;
}
for(i=l1;i<=u2;i++){
A[i]=B[i];
}
}
void merge(int lb,int ub)
{
int lo;
lo=(ub+lb)/2;
if(lb<ub){
merge(lb,lo);
merge(lo+1,ub);
sort(lb,lo,lo+1,ub);
}
}
int main()
{
for(int i=0;i<7;i++)
cout<<A[i]<<" ";
cout<<endl;
merge(0,6);
//sort(0,3,4,6);
for(int i=0; i<7;i++)
cout<<A[i]<<" ";
return 0;
}
```