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Control Statements : MCQs & PYQs with Explanation

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Control Statements : Solved MCQs and PYQs

This section contains carefully selected MCQs and Previous Year Questions with explanations to help students understand concepts and prepare effectively for examinations, interviews, and competitive tests.

Q: 1Find output of the following program?
void main()
{
    int a,b;
    for(a=1,b=1;a<5,b<10;b++)
        cout<<a;
}

A

Expression syntax error occurred

B

Prints values from 1 to 9

C

Prints 1 nine time

D

Loop made infinite

Option C

Here, the important point is the comma operator used in the for-loop condition.
for(a=1,b=1; a<5,b<10; b++)
    cout << a;
In a for loop, the condition part can use the comma operator (,). When the comma operator is used, all expressions are evaluated, but the result of the last expression decides the loop condition.

  • The a<5 is evaluated but its result is ignored.
  • The b<10 is the last expression, so it controls the loop.
  • The a is initialized to 1 and is never changed inside the loop.
  • The b starts from 1 and is incremented each iteration.
  • The loop runs as long as b<10, i.e., for b=1 to 9.
  • Each time, cout<<a; prints the value of a, which is always 1.

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