var x = prompt("요일에 관련된 수를 입력하시오..!!(월요일= 1, 화=2, ");
if(x==1){
document.write("월");
}else if(x==2){
document.write("화");
}else if(x==3){
document.write("수");
}else if(x==4){
document.write("목");
}else if(x==5){
document.write("금");
}else if(x==6){
document.write("토");
}else if(x==7){
document.write("일");
}else{
document.write("잘못입력했음");
}
if(x==1){
document.write("월");
}else if(x==2){
document.write("화");
}else if(x==3){
document.write("수");
}else if(x==4){
document.write("목");
}else if(x==5){
document.write("금");
}else if(x==6){
document.write("토");
}else if(x==7){
document.write("일");
}else{
document.write("잘못입력했음");
}
switch(x){
case "1":
document.write("월");
break;
case "2":
document.write("화");
break;
case "3":
document.write("수");
break;
case "4":
document.write("목");
break;
case "5":
document.write("금");
break;
case "6":
document.write("토");
break;
case "7":
document.write("일");
break;
default:
document.write("잘못입력했음");
}