c program to convert any three digit number in words

In this program if you enter any three digit number like 123 then it will print one hundred twenty three for this you just need the basic knowledge of switch case.Then go through the given program below.

#include<stdio.h>

int main(){

int first,second,third;

printf("enter 3 digit number\n");

scanf("%1d%1d%1d",&first,&second,&third);

switch(first%10){

case 1: printf(" one hundred");

break;

case 2: printf(" two hundred");

break;

case 3: printf(" three hundred");

break;

case 4: printf(" four hundred");

break;

case 5: printf(" five hundred");

break;

case 6: printf(" six hundred");

break;

case 7: printf(" seven hundred");

break;

case 8: printf(" eight hundred");

break;

case 9: printf(" nine hundred");

break;

}

switch(second%10){

case 0:break;

case 1: switch(third%10){

case 0: printf(" ten");break;

case 1: printf(" eleven");break;

case 2: printf(" twelve");

break;

case 3: printf("thirteen");

break;

case 4: printf(" fourteen");

break;

case 5: printf(" fifteen");

break;

case 6: printf(" sixteen");

break;

case 7: printf(" seventeen");

break;

case 8: printf(" eighteen");

break;

case 9: printf(" nineteen");

break;

}

return 0;

break;

case 2: printf(" tewnty");

break;

case 3: printf(" thirty");

break;

case 4: printf(" fourty");

break;

case 5: printf(" fifty");

break;

case 6: printf(" sixty");

break;

case 7: printf(" seventy");

break;

case 8: printf(" eighty");

break;

case 9: printf(" ninety");

break;

}

switch(third%10){

case 0:break;

case 1: printf(" one");

break;

case 2: printf(" two");

break;

case 3: printf(" three");

break;

case 4: printf(" four");

break;

case 5: printf(" five");

break;

case 6: printf(" six");

break;

case 7: printf(" seven");

break;

case 8: printf(" eight");

break;

case 9: printf(" nine");

break;

}

}