Write a Program to accept two numbers and a operator (+, -, *, / from user and complete that particular operation only in C language

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Friends, my today's program is that we will take two numbers from the keyboard and addition,substraction,multiply and Divide  it will only part in the same program with the help of switch case.
#include(stdio.h)
#include(conio.h)
main()
{
int n,rem,a,b;
char op;
clrscr();
printf("Enter Operator(+,-,*,/)...");
scanf("%c",&op);
printf("Enter numbers...");
scanf("%d%d",&a,&b);
switch(op)
{
      case '+' :
                        printf("Result : %d ",a+b);
                        break;
      case '-' :
                        printf("Result : %d ",a-b);
                        break;
     case '*' :
                       printf("Result : %d ",a*b);
                       break;
     case '/' :
                       printf("Result : %d ",a/b);break;
      default  :
                      printf("Invalid operator....");
}
getch();
}