Write a program and print the calculator operations using interface and implementation (Use switch case).

#import <Foundation/Foundation.h>

@interface calc:NSObject

{

    int a,b,res,ch;

}

-(void)calculate;

@end

@implementation calc

-(void)calculate;

{

printf("\n Menu:\n");

printf("\n\t(1)ADDITION");

printf("\n\t(2)SUBTRACTION");

printf("\n\t(3)MULTIPLICATION");

printf("\n\t(4)DIVISION");

printf("\n\t(0)Exit");

printf("\n Enter your Choice:\n");

scanf("%d",&ch);  

if (ch<=4 && ch>0)

{

    printf("Enter two numbers:\n");

    scanf("%d%d",&a,&b);

}

switch (ch)

{

    case 1:

        res=a+b;

        printf("\n Addition:%d",res);

        break;

       

    case 2:

        res=a-b;

        printf("\n Subtraction:%d",res);

        break;

       

    case 3:

        res=a*b;

        printf("\n Multiplication:%d",res);

        break;

       

    case 4:

        res=a/b;

        printf("\n Division:%d",res);

        break;

       

    case 0:

        printf("\n Choice Terminated");

        exit(1);

        break;

       

    default:

        printf("\n Invalid Choice..!!");

              

}

}

@end

int main (int argc, const char * argv[])

{

    calc *cal=[[calc alloc]init];

    [cal calculate];   

   

    return 0;

}