Basic calculator using C programming

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#include <stdio.h>
#include <stdlib.h>
int main()
{
//num1 num2 +
int num1,num2;
char operator;
scanf("%d %d %c",&num1,&num2,&operator);
switch(operator)
{
case '+':printf("%d",num1+num2);
break;
case '-':printf("%d",num1-num2);
break;
case '*':printf("%d",num1*num2);
break;
case '/':
if(num2==0)
{
printf("Not divisible by zero");
break;
}
else{
printf("%d",num1/num2);
break;
}
default:
printf("invalid");
}
return 0;
}

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