How To complete string from another string [closed] - c++

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#include<iostream>
#include<string>
using namespace std;
int main ()
{
string str;
string str2;
int count;
cin>>count;
while(count!=0)
{
cin>>str;
cin>>str2;
int l=str2.length()-1;
cout<<str[0];
if(str.length()==str2.length())
{
for(int x=1;x<str.length();x++)
cout<<str2[x-1]<<(str[x]);
cout<<str2[l];
cout<<endl;
}
count--;
}
return 0;
}
Given two strings S and T. Print a new string that contains the following:
The first letter of the string S followed by the first letter of the string T.
the second letter of the string S followed by the second letter of the string T.
and so on...
In other words, the new string should be ( S0 + T0 + S1 + T1 + .... ).
Note: If the length of S is greater than the length of T then you have to add the rest of S letters at the end of the new string and vice versa.
Input
The first line contains a number N (1 ≤ N ≤ 50) the number of test cases.
Each of the N following lines contains two string S, T (1 ≤ |S|, |T| ≤ 50) consists of lower and upper English letters.
Output
For each test case, print the required string.
Example
inputCopy
2
ipAsu ccsit
ey gpt
outputCopy
icpcAssiut
egypt
in my good i get errors in some cases can someone tell me how to solve this probelm

Answer 1

A straightforward approach can look the following way
std::string::size_type i = 0;
for ( auto n = std::min( str.size(), str2.size() ); i < n; i++ )
{
std::cout << str[i] << str2[i];
}
while ( i < str.size() )
{
std::cout << str[i++];
}
while ( i < str2.size() )
{
std::cout << str2[i++];
}
Here is a demonstration program
#include <iostream>
#include <string>
#include <algorithm>
int main()
{
std::string str( "ipAsu" );
std::string str2( "ccsit" );
std::string::size_type i = 0;
for (auto n = std::min( str.size(), str2.size() ); i < n; i++)
{
std::cout << str[i] << str2[i];
}
while (i < str.size())
{
std::cout << str[i++];
}
while (i < str2.size())
{
std::cout << str2[i++];
}
std::cout << '\n';
}
The program output is
icpcAssiut
You could move the basic code in a separate function.

Answer 2

Notice the Note given above:
Note: If the length of S is greater than the length of T then you have to add the rest of S letters at the end of the new string and vice versa.
Your code runs well in terms of two same-length strings. However, cause "if(str.length()==str2.length())" in your code, your program will only output one character!
Example: given "acd" and "b", your answer is "a", but "abcd" is expected.