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I have a line
bookval_int_curr = [str1 intValue] - [str2 intValue];
But for some reason bookval_int_curr seems to be returning nil. Am I doing something wrong ?
I Assume that str1 and str2 are strings. Then if they doesn’t begin with a valid decimal text representation of a number, NSString would return 0. 0 – 0 = 0.
If you are trying to assign 0 to the object, then it’s address would be nil.