#include<stdio.h>
void main()
{ int x,y;
char ch;
do{ printf("\n press ‘1’ for addition");
printf("\n press ‘2’ for substraction");
printf("\n press ‘0’ for exit \n");
scanf("%c",&ch);
if(ch==‘1’||ch==‘2’)
{ printf(“enter the values of x and y \n”);
scanf("%d%d",&x,&y);
}
switch(ch)
{
case ‘1’:printf(“addtion=%d”,(x+y));
break;
case ‘2’:printf(“substraction=%d”,(x-y));
break;
case ‘0’: break;
default: printf(“incorrect entry”);
break;
}
} while(ch!=‘0’);
getch();
}