Output writing – Function – pass by reference

Problem Statement - Output writing – Function – pass by reference

Find and write the output of the following C++ program code: Note : Assume all required header files are already included in the program.

void Revert(int &Num, int Last=2) { Last=(Last%2==0)?Last+1:Last-1; for(int C=1; C<=Last; C++) Num+=C; } void main() { int A=20,B=4; Revert(A,B); cout<<A<<"&"<<B<<endl; B--; Revert(A,B); cout<<A<<"#"<<B<<endl; Revert(B); cout<<A<<"#"<<B<<endl; }

Solution

Run Output

Notes

Revert(A,B); //This will add 1,2,3,4,5 successively to number A making it 21,23,26,30 and 35 as per logic since B is 4 and it will allow loop to run for 5 times as Last will become 5
cout<<A<<“&”<<B<<endl; // This will print 35&4 as per logic

B–; //B reduced to 3 after this instruction
Revert(A,B); //This will add 1,2 successively to number A which is now 35 (as A is passed by reference) making it 36,38 as per logic since B is 3 and it will allow loop to run for 2 times as Last will become 2

cout<<A<<“#”<<B<<endl; // This will print 38&3 as per logic

Revert(B); //This will add 1,2,3 successively to number B making it 4,6,9 as per logic since second param will take default value of 2 and it will allow loop to run for 3 times as Last will become 3
cout<<A<<“#”<<B<<endl; // This will print 38#9 as per logic

Common Errors

Student often forget that the number is being added successively to initial number and not at once.

CSKC| Created: 3-Dec-2018 | Updated: 4-Dec-2018|CBSE12A-2018

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Output Writing – passing integers as ref and as def value CBSE12A-2015



Example(s):Palindrome, prime, armstrong, "linear search", reverse etc.


Example(s):1575, 1632, 1539 (Only one at a time)

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Problem Statement - Output writing – Function – pass by reference

Solution

TC++ #5197 X

Run Output

Notes

Common Errors

TC++ #5197