作业

#include 
#include 
#include 
#include "myhead.h"
int main(int argc, const char *argv[])
{
	char str[]="12345";
	char buf[]="qwer";
	int i=0;
	while(buf[i]!=0)
	{
		str[i]=buf[i];
		i++;
	}
	str[i]=buf[i];
	printf("str=%s\n",str);
	strcpy///
	int j=0;
	int sum=0;
	while(str[j]!=0)
	{
		sum++;
		j++;
	}
	printf("str的长度为%d\n",sum);
	///strlen///
	return 0;
}

#include 
#include 
#include 
#include "myhead.h"
int main(int argc, const char *argv[])
{
	char str[20]="12345";
	char buf[20]="qwer";
	int i=0;
	while(buf[i]==str[i])
	{
		if(str[i]=0)
		{
			break;
		}
		i++;
	}
	if(str[i]-buf[i]>0)
	{
		printf("%s大于%s\n",str,buf);
	}
	else if(str[i]-buf[i]<0)
	{
		printf("%s小于%s\n",str,buf);
		
	}
	else
		printf("%s等于%s\n",str ,buf);
	strcmy///
	int j=0;
	int x=0;
	while(str[j])
	{
		j++;
	}
	while(buf[x])
	{
		str[j]=buf[x];
		j++;
		x++;
	}
	str[j]=buf[x];
	printf("str=%s\n",str);
	///strcat///
	return 0;
}