Output writing – If-else ambiguities – Computer Sir Ki Class


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Solved Problem #CPP#3249    siteicon   siteicon  

Problem Statement - Output writing – If-else ambiguities

Write output of the following code. Assume that required header files are included.

int main()
  int x=10,y=20;
  if(x=0) cout<<"Hello"<<endl;
  else cout<<"Sorry"<<endl;
  if(y=10) cout<<"Hello"<<endl;
  else cout<<"Sorry"<<endl;
  if(x+y==10) cout<<"Hello"<<endl;
  else cout<<"Sorry"<<endl;
  return 0;


TC++ #3249


Run Output



int x=10,y=20;  //Initial values

if(x=0) cout<<“Hello”<<endl; else cout<<“Sorry”<<endl;
Here instead of comparison only assignment is done. Since by assignment there is zero value put so the selection answer would be false. In c++ any value of 0 is considered as equivalent to false. So it will go to the else condition Sorry would be printed.

if(y=10) cout<<“Hello”<<endl; else cout<<“Sorry”<<endl;
Here again assignment is there but this time it as positive value being assigned. So it will assume the condition to be true and Hello will be printed.

if(x+y==10) cout<<“Hello”<<endl; else cout<<“Sorry”<<endl;
Now x has become 0 and y has become 10 due to previous two assignments within the if condition checks.  So the condition x+y==10  will be true. Here addition will occur before assignment. Now Hello would be printed.


Common Errors

  • Student often forget to watch that there is assignment happening in first two if conditions and comparison is just not happening.



sunmitra| Created: 2-Feb-2018 | Updated: 18-Dec-2018|

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