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@import Foundation; @interface Subber : NSObject - (int)sub:(int)num1 andNum2:(int)num2; @end @implementation Subber - (int)sub:(int)num1 andNum2:(int)num2{ return num1 - num2; } @end int sub(int a, int b) { Subber* subber = [[Subber alloc] init]; return [subber sub:a andNum2:b]; }