GK One-Line Question & Answer

What is the output: int a=1; cout << a (1, 6, 73, 3, 4, 'What does the 'delete' operator do when called on a null pointer?

What does the 'delete' operator do when called on a null pointer?

What is operator[] overloaded for in std::vector?

What is the output: int x=0; cout<<(x=5)<<' '<<(x==5);

What is the type of: sizeof expression?

What is the output: int a=4,b=2; cout<<(a^=b,b^=a,a^=b)<<' '<<a<<' '<<b;

What is the output: cout << (1 << 0) << ' ' << (1 << 1) << ' ' << (1 << 4);

What is the output: bool a=true,b=false; cout<<(a&&b)<<(a||b)<<(!a);

What does the :: operator do when used without a left-hand side?

What is the output: int x=5; cout<<x<<x++<<x;

What is the output: int a=10; cout<<(a>5)+(a<20)+(a==10);

Which operator is used for pointer-to-member access?

What is the result: int x = 5; x = x > 3 ? x + 1 : x - 1; cout << x;

What is the output: int a = 5, b = 10; cout << (a < b ? a : b) * 2;

What is the output: cout << 10/3*3;

What does overloading operator= return by convention?

What is the output: int x = -5; cout << (x >> 1);

What is the output: int a=3,b=4; if(a=0) cout<<a; else cout<<b;

What is the output: for(int i=0;i<5;i++) if(i==3) continue; cout<<i;

What is the output: int x=10; switch(x){case 10: cout<<'A'; case 20: cout<<'B'; default: cout<<'C';}

What does 'goto' do in C++?

What is the output: int i=0; do{ cout<<i; i++; }while(i<0);

What is the output: for(;;) { static int x=0; cout<<x++; if(x>2) break; }

What is the output: int x=5; if(x>3) if(x>4) cout<<'A'; else cout<<'B';

What is the output: for(int i=0;i<3;i++) for(int j=0;j<3;j++) if(i==j) goto done; done: cout<<'X';

What is a 'range-based for loop' iteration over a raw array?

What is the output: int x=5; while(x (1, 6, 74, 4, 4, 'What happens when break is used inside a nested loop?', 'Nested loop के अंदर break use करने पर क्या होता है?', 'Breaks out of all loops', 'सभी loops से बाहर निकलता है', 'Breaks out of innermost loop only', 'केवल innermost loop से बाहर निकलता है', 'Compile error', 'Compile error', 'Undefined behavior', 'undefined behavior', NULL, 'option_b', 'break only exits the immediately enclosing loop or switch; not outer loops.', 0, '2026-05-25', '2026-05-25'), (1, 6, 74, 4, 4, 'What is the output: switch(2.5){ case 2: cout<<'A'; break; default: cout<<'B'; }

What happens when break is used inside a nested loop?

What is the output: switch(2.5){ case 2: cout<<'A'; break; default: cout<<'B'; }

What is the output: for(int i=1; i<=4; i*=2) cout<<i<<' ';

What is the output: int x=0; for(;x<5;) cout<<x++;

What does 'fallthrough' attribute do in C++17?

What is the output: int i=5; for(i=0; i<3; i++) {} cout<<i;

What is the output: int x=1; if(x=0) cout<<'T'; else cout<<'F';

What is the output of an infinite while(true) loop with no break?

What is the output: for(int i=0;i<5;i++) { if(i%2==0) continue; cout<<i; }

What is the difference between while and do-while loops?

What is the output: int x=3; switch(x) { case 1: case 2: case 3: cout<<'A'; break; default: cout<<'B'; }

What is the output: int n=10; for(int i=2; i*i<=n; i++) if(n%i==0) { cout<<'C'; break; }

What is the output: int x=0; while(x<3) { x++; if(x==2) break; } cout<<x;