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Editorial Team
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Asked: 2026-06-17T06:31:24+00:00

NSString *formul=@3^2; NSExpression *e = [NSExpression expressionWithFormat:formul]; int result = [[e expressionValueWithObject:nil context:nil] intValue];

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NSString *formul=@"3^2";
NSExpression *e = [NSExpression expressionWithFormat:formul];
int result = [[e expressionValueWithObject:nil context:nil] intValue];
NSLog(@"formule:%d", result);

I am trying to calculate (a+b)^2.

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1 Answer

  1. Editorial Team

    Use ** instead of ^

    NSString *formul=@"3 ** 2";
NSExpression *e = [NSExpression expressionWithFormat:formul];
int result = [[e expressionValueWithObject:nil context:nil] intValue];
NSLog(@"formule:%d", result);

    But beware Foundation’s power function is left associative (which is wrong). See Dave Delong’s post.

    http://funwithobjc.tumblr.com/post/6196535272/parsing-mathematical-expressions

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