for문 연습 2.cpp

#include<stdio.h>
exam6(){
	int i, count = 0,sum = 0;
	for(i = 3; i<=50; i=i+3)
	{
		printf("%4d",i);
		sum = sum + i;
		++count;
		if(count%5==0){
			printf("\n");
		}
	
	 } 
	 	printf("\n sum = %d\n",sum);
}
exam7(){
	char ch;
	for(ch = 'F'; ch>='A'; ch--)
	{
		printf("%4c",ch);
	}
}
exam8(){
	int i, n, fact = 1;
	scanf("%d", &n);
	for(i=1; i<=n; i++)
	{
		fact = fact * i;
	}
	printf("%d! = %d\n", n,fact);
}
exam9(){
	int i ,dan;
	printf("원하는 단은?");
	scanf("%d",&dan);
	printf("\n***%d단***\n",dan);
	for(i=1;i<=9;i++)
	{
		printf("%d * %d = %d\n",dan,i,dan * i);
	 } 
}
exam10(){
	int n1,n2,i;
	printf("두 수 입력 :");
	scanf("%d %d",&n1,&n2);
	if(n1<n2)
	{
		for(i=n1; i<=n2;i++)
		printf("%d",i);
	}
	else{
		for(i = n2; i<=n1; i++)
		printf("%d",i);
	}
}
main()
{
int no;
while(1){
	printf("문제번호 : ");
	scanf("%d",&no);
	
	switch(no){
		case 6: exam6(); break;
		case 7: exam7(); break;
		case 8: exam8(); break;
		case 9: exam9(); break;
		case 10: exam10(); break;
	}
}
}