#include<stdio.h>
#include<conio.h>
int main()
{
 
float a,b,c;
int d;
printf("Enter the value of a and b\n");
printf("value of a is:");
scanf("%f",&a);
printf("value of b is: ");
scanf("%f",&b);
printf("Enter the any one of one number from keyboard 1,2,3,4,5,6\n");
printf("press 1 for addition\n");
printf("press 2 for subtraction\n");
printf("press 3 for muliplication\n");
printf("press 4 for division\n");
printf("press 5 for average\n");
scanf("%d",&d);
switch(d)
{
case 1:
c=a+b;
printf("sum=%f",c);
break;
case 2:
c=a-b;
printf("difference=%f",c);
break;
case 3:
c=a*b;
printf("product=%f",c);
break;
case 4:
c=a/b;
printf("divison=%f",c);
break;
case 5:
c=(a+b)/2;
printf("avg=%f",c);
break;
case 6:
default:
printf("invalid command");
}
getch();
}