for the code below everything is working but not displaying the output

Question

#include <iostream>
#include<string>
using namespace std;

int main() {
string a,b;
int n,i,j;
cout<<"enter the string to be reversed\n";
cin>>a;
cout<<"entered string is\n";
cout<<a<<endl;
n=sizeof(a);
cout<<"size is: "<<n<<endl;
for(i=0;i<=n;i++)
{
j=n-i;
cout<<" j is: "<<j<<endl;
b[j]=a[i];
}
cout<<"the reversed string is\n";
cout<<b;
return 0;
}

Answer 1

You need to use length() or size() to get the length of a string. And you have to make sure that the range of j is between 0 and a.length()-1. Also, you need to initialize b before starting to use it.

#include <iostream>
#include<string>
using namespace std;

int main() {
string a,b;
int n,i,j;
cout<<"enter the string to be reversed\n";
cin>>a;
b=a;
cout<<"entered string is\n";
cout<<a<<endl;
n=a.length();
cout<<"size is: "<<n<<endl;
for(i=0;i<n;i++){
j=n-i-1;
cout<<" j is: "<<j<<endl;
b[j]=a[i];
}
cout<<"the reversed string is\n";
cout<<b;
return 0;
}