How to evaluate the string equation in ios

Question

Is there way to solve the string equations in ios ?

For example

Input:

NSString * str =@\"1+2\";

Output:

<

Answer 1

You can use NSExpression for this:

NSExpression *expression = [NSExpression expressionWithFormat:@"1+2"];
NSLog(@"%@", [expression expressionValueWithObject:nil context:nil]);

For further information read the documentation of the used methods.