CODEWITHSUNDEEP
c++c++11
ITsme
ITsme

Reputation: 47

Expected nested-name-specifier before ‘namespace’

I have a basic program to add 2 binary strings. Given two binary strings a and b, add them together and return the resulting string. I am compiling it with a C++ compiler (G++ v8.4.0)

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

std::string addBinaryStrings(std:: string a, std:: string b) 
{ 
    std::string result = ""; 
    int s = 0;         

    int i = a.size() - 1, j = b.size() - 1; 
    while (i >= 0 || j >= 0 || s == 1) 
    { 
        s += ((i >= 0)? a[i] - '0': 0); 
        s += ((j >= 0)? b[j] - '0': 0); 
         result = char(s % 2 + '0') + result; 
        s /= 2; 
        i--; j--; 
    } 
    return result; 
} 
int main() 
{ 
    string a,b;
    getline(cin, a);
    getline(cin, b);
    cout << addBinaryStrings(a, b) << endl; 
    return 0; 
}

When I execute this I get the following error :

main.cpp online 2:7: error: expected nested-name-specifier before ‘namespace’
 using namespace std;
       ^~~~~~~~~

Where am I going wrong?

Upvotes: 2

Views: 11014

Answers (1)

Karan Kamboj
Karan Kamboj

Reputation: 119

There is nothing wrong with this code as its working on my C++ GNU compiler. So there is something wrong with your compiler. I suggest you to reset settings of your compiler or use another compiler. You can also use online IDE.

Upvotes: -2

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