Example(s):Palindrome, prime, armstrong, "linear search", reverse etc.
Example(s):1575, 1632, 1539 (Only one at a time)
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[lwa]
Solved Problem
#CPP#2314
Problem Statement - Assignment, equality comparison problem
Find the output of the program given below. Assume all relevant header files are included
int main( )
{
int a,b,c=101,d=102;
a=(c=d);
cout<<a<<endl;
b=(c==d);
cout<<b<<endl;
return 0 ;
}
Solution
TC++ #2314
Run Output
102
1
Notes
int a,b,c=101,d=102;
Here a and b do not have initial values and c and d have values 101 and 102 respectively.
a=(c=d);
Here left hand side inside will be evaluated first where the value of d is assigned to c. So c will leave its original value and will be assigned the value of d which is 102. So from left hand side c will contain 102. Finally with the last assignment operation a will contain the new value of c which will be 102.
cout<<a<<endl;
This will print 102 as explained above.
b=(c==d);
Here the operator inside bracket on the right hand side is the comparison operator for equality check. Since c has already be assigned 102 in the previous operation, so it will become equal to d which was originally set for 102. Which means that comparison operation will return true status. In c++ if comparison evaluates to true, it is stored as 1 if equated to an integer storage. So b will be 1.
cout<<b<<endl;
This will print 1 as explained above.
Common Errors
The modification of value of c to value of d in first expression is often missed by students.
The watch over difference between = and == operator is essential for this kind of programs.
