I am not able to find the mistake in my code it is repeating the last digit

#1

#include
using namespace std;
int Sum(int a[], int b[], int n, int m){
int sum[n];
int i = n - 1, j = m - 1, k = n - 1;
int c = 0, s = 0,x=0;
while (j >= 0) {
s = a[i] + b[j] + c;
sum[k] = (s % 10);
c = s / 10;
k–;
i–;
j–;
}
while (i >= 0) {
s = a[i] + c;
sum[k] = (s % 10);
c = s / 10;
i–;
k–;
}
for (int i = 0; i <= n-1; i++) {
cout<<sum[i]<<", ";
x=sum[i];
}

return x;
}
int main(){
int a[1000];
int b[1000];
int n;
int m;
cin>>n;
for(int i=0;i<n;i++){
cin>>a[i];
}
cin>>m;
for(int j=0;j<m;j++){
cin>>b[j];
}

if (n >= m)
cout<<Sum(a, b, n, m);
else
cout<<Sum(b, a, m, n);
cout<<" END";
return 0;
}

#2

Hey @apoorvsin

#include<iostream>
using namespace std;
int sum_of_arrays(int a[],int b[],int n,int m){
	int c=0,s=0,x=0;
	int i=n-1;
	int j=m-1;
	int k=n-1;
	int sum[n];
  while(j>=0){
	  s=a[i]+b[j]+c;
	  sum[k]=s%10;
	  c=s/10;
	  i--;
	  j--;
	  k--;
  }
  while(i>=0){
	  s=a[i]+c;
	  sum[k]=s%10;
	  c=s/10;
	  i--;
	  k--;
  }
  if(c!=0)cout<<c<<", "; //say we add 9 + 9 then its 18  so we print 1 
  for(int i=0;i<n;i++){
	  cout<<sum[i]<<", ";
	  x=sum[i];
  }
  return x;
}
int main() {
	int n,m;
	cin>>n;
	int a[1000];
	int b[1000];
	for(int i=0;i<n;i++){
		cin>>a[i];
	}
	cin>>m;
	for(int j=0;j<m;j++){
		cin>>b[j];
	}
	if(n>m){
	 sum_of_arrays(a,b,n,m);	//corrected this
	}
   else
   	 sum_of_arrays(b,a,m,n);  	//corrected this

	 cout<<"END";//corrected this
	return 0;
}
#3

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