how to make a simple calculator in c

 #include<stdio.h>

int main()

{

int a, b, s, i;

printf("Enter the first number: \n");

   scanf("%d", &a);

   

   printf("Enter the seacond number: \n");

   scanf("%d", &b);

   

   printf("......Menu.....\n 1 for addiction \n 2 for substraction \n 3 for multipliction \n 4 for divition \n enter your choice:");

   scanf("%d", &i);

   

   if(i==1)

   s = a+b;

   

   else if (i==2)

   s = a-b;

   

   else if (i==3)

   s = a*b;

   

   else if (i==4)

   s = a/b;

   

   else ("You entered the wrong input");

   printf("The result is %d", s);

   

   return 0;

}