Scanning of numbers and string in c

#include<stdio.h>

int main (void)
{
    int number;

    printf("Enter user input :");
    scanf ("%d",&number);

    if(number == 1)
    {
        printf("Number is 1");
    }

    else if (number == 2)
    {
        printf("Number is 2");
    }

    else if (number == 3)
    {
        printf("Number is 3");
    }
    else
    {
        printf("Invalid...