一些字符串函数的使用

书中的这段代码使用到了strcpy，strcat，strcmp，以及经常用到的strlen
还使用到了sprintf与scanf 中%2d限制读入两个数字，具体代码的含义就且不论

include <stdio.h>

include <string.h>

define MAX_REMINDER 50

define MSG_LEN 60

void read_line(char str[],int n)
{
	int i=0;
	char ch;
	while((ch=getchar())!='\n')
	{
		if(i<n) str[i++]=ch;
		
	}
	str[i]='\0';
	
	 
}

int main()
{
	char reminder[MAX_REMINDER][MSG_LEN+3];
	char day_str[3],msg_str[MSG_LEN+1];
	int day,i,j,num_reminder=0;
	
	for(;;)
	{
		if(num_reminder==MAX_REMINDER)
		{
			printf("NO SPACE LEFT");
			break;
		}
		
		printf("Enter day and reminder: ");
		scanf("%2d",&day);
		if(day==0) break;
		sprintf(day_str,"%2d",day);
		read_line(msg_str,MSG_LEN);
		for(i=0;i<num_reminder;i++)
			if(strcmp(day_str,reminder[i])<0)
				break;
	
		for(j=num_reminder;j>i;j--)
			strcpy(reminder[j],reminder[j-1]);
		
		strcpy(reminder[i],day_str);
		strcpy(reminder[i],msg_str);
		
		num_reminder++;
	}
	
	printf("DAY REMINDER");
	for(i=0;i<num_reminder;i++)
	{
		printf("%s\n",reminder[i]);
	}	
	
	return 0;
		
	
}