Calculator in c code

#include<stdio.h>

void main()

{

 int integer1, integer2, result;
  char a;
printf("choose one of these options ");
printf("calculater\n "); printf("press '+' for addition\npress '-' for subtraction\npress '*' for multiplication\npress'/' for division\npress '%' for percentage\n: ");
   scanf("%c",&a);

  printf("Enter first number: ");
  scanf("%d",&integer1);

  printf("Enter Second number: ");
  scanf("%d",&integer2);

if(a=='+')
{result=integer1+integer2;
printf("Your result is after addition = %d\n",result); }
 else if(a=='-')
{result=integer1-integer2;
printf("Your result is after subtraction = %d\n",result); }
 else if(a=='/')
{result= integer1/integer2;
printf("Your result is after division = %d\n",result); }
 else if(a=='*')
{result= integer1*integer2;
printf("Your result is after multiplication = %d\n",result); }
 else if(a=='%')
{result= integer1%integer2;
printf("Your result is after percentage = %d\n",result); }
else
{printf("invalid entery ");}
 
printf("thankyou for using my software\n ");
 getch();
}