Problem	card
User	VehaanGVikram
Submission Time	2025-01-20 15:18:47
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

card.cpp: In function ‘int main()’:
card.cpp:9:15: error: ‘null’ was not declared in this scope
9 | string str = null;
| ^~~~