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#include<conio.h>
#include<stdio.h>
main(){

char let;
clrscr();

printf("Enter a letter: ");

let = getche();

switch(let){

case 'R': printf("\n Red"); break;

case 'G': printf("\n Green"); break;

case 'B': printf("\n Blue"); break;

default: printf("\n Unknown Color");

}

getch();

}