程序基础考试C为例

/*函数实现 strlen();strcmp*/

/*
第二题 
*/


#include <stdio.h>


int str_len(char str[])                         //字符串长度 
{
	int i=0,length=0;
	while(str[i++]!='\0') length++;             //非空加一 
	return length;
}


int str_cmp(char str1[],char str2[])            //字符串比较 
{
	int i=0;
	while((str1[i]==str2[i]))                   //字符不等后移一位 
	{ 
		if(str1[i]=='\0') return 0;             //都是空相等 
		i++;	
	}
	if(str1[i]>str2[i]) return 1;               //"谁"大"谁"就大 
	else return -1;
}


void main()
{
	printf("helloworld");
	printf("\t%d\n",str_len("helloworld"));           //helloworld长度 
	printf("hello,hellow");
	printf("\t%d\n",str_cmp("hello","hellow"));       //比较hello和hellow大小 
	printf("hello,hell");
	printf("\t%d\n",str_cmp("hello","hell"));         //比较hello，hell大小 
	printf("hello,hello");
	printf("\t%d\n",str_cmp("hello","hello"));        //比较hello，hello大小 
	printf("hello,hellO");
	printf("\t%d\n",str_cmp("hello","hellO"));        //比较hello，hellO大小 
}