calc.h #import <Foundation/NSObject.h> @interface calc:NSObject -(int) plus:(int)x y:(int)y; @end calc.m #import "calc.h" @implementation calc -(int) plus:(int)x y:(int)y { return x+y; } @end main.m #import <Foundation/Foundation.h> #import <stdio.h> #import "calc.m" int main(void) { id arp = [[</stdio.h></foundation/foundation.h></foundation/nsobject.h>…