Question

1.   What is the output of the following code:
string s1 = “X”;
string s2 = “A” + s1 + “BC” + s1 + “DEF” + s1 + “G”;
cout << s2;

2.   What is the output of the following code:

string s1 = “X”;
string s2 = “A” + s1 + “BC” + s1 + “DEF” + s1 + “G”;
cout << s[0] + s[3];

3.   What is the output of the following code:
string s1 = “X”;
string s2 = “A” + s1 + “BC” + s1 + “DEF” + s1 + “G”;
cout << “Length is : “ << s.length());

4.   What is the output of the following code:
string s1 = “ABC”;
string s2 = “DEF”;
string s3;

s3 = s1 + “ “ + s2;

cout << s3;

Answer 1

1) Answer: AXBCXDEFXG

Explanation:

Program:

Explanation:

Line 1: //Header file
Line 2: //declarative region
Line 3: //Start of main()
Line 4: // Here Initializing the string variable called s1
Line 5:// Here Initializing the string variable called s2
Line 6:// // Here Printing the Value of s2
Line 7://End of main()

Program:

#include <iostream>
using namespace std;
int main() {
string s1 = "X";
string s2 = "A" + s1 + "BC" + s1 + "DEF" + s1 + "G";
cout << s2;
}

Output:

2) Answer: 132

Explanation:

Program:

Explanation:

Line 1: //Header file
Line 2: //declarative region
Line 3: //Start of main()
Line 4: // Here Initializing the string variable called s1
Line 5:// Here Initializing the string variable called s2
Line 6://Here declaring the string variable called s3
Line 7://Here calculating the s2[0] value s2[3] value and adding these two and Printin the result
Line 8://End of main()

Program:

#include <iostream>
using namespace std;
int main() {
string s1 = "X";
string s2 = "A" + s1 + "BC" + s1 + "DEF" + s1 + "G";
cout << s2[0] + s2[3];
}

Output:

3) Answer: Length is : 10

Explanation:

Program:

Explanation:

Line 1: //Header file
Line 2: //declarative region
Line 3: //Start of main()
Line 4: // Here Initializing the string variable called s1
Line 5:// Here Initializing the string variable called s2
Line 6:// // Here Printing the Length of s2
Line 7://End of main()

Program:

#include <iostream>
using namespace std;
int main() {
string s1 = "X";
string s2 = "A" + s1 + "BC" + s1 + "DEF" + s1 + "G";
cout << "Length is : " << s2.length();
}

Output:

4)Answer:   ABC DEF

Explanation:

Program:

Explanation:

Line 1: //Header file
Line 2: //declarative region
Line 3: //Start of main()
Line 4: // Here Initializing the string variable called s1
Line 5:// Here Initializing the string variable called s2
Line 6://Here declaring the string variable called s3
Line 7://Here calculating the s3 value by adding the two strings seperated by Space
Line 8:// Here Printing the Length of s3
Line 9://End of main()

Program:

#include <iostream>
using namespace std;
int main() {
string s1 = "ABC";
string s2 = "DEF";
string s3;
s3 = s1 + " " + s2;
cout << s3;
}

Output: