Switch case.c

#include<stdio.h>
int main()
{
  int i,a,b,n,choice;
  
  printf("1. Addition two numbers\n");
  
  printf("2. Subtraction two numbers\n");
  
  printf("3. Multiply two numbers\n");
  
  printf("4. Series Display\n");
  
  printf("========================================\n\n\n");
  
        printf("Enter your choice: ");
        scanf("%d",&choice);
        
        switch(choice)
        {
        case 1:
            printf("Enter the value of a & b: ");
            scanf("%d %d",&a,&b);
            printf("%d\n",a+b);
            break;
            
        case 2:
            printf("Enter the value of a & b: ");
            scanf("%d %d",&a,&b);
            printf("%d\n",a-b);
            break;
            
        case 3:
            printf("Enter the value of a & b: ");
            scanf("%d %d",&a,&b);
            printf("%d\n",a*b);
            break;
            
        case 4:
            printf("Enter the value of N: ");
            scanf("%d",&n);
            for(i=1;i<=n;i++)
                printf("%d\t",i);
            printf("n");
            break;
            
        default:
            printf("out of value\n");
            break;
        }
        
  return 0;
}