20170912_字符串比较函数strcmp的实现

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20170912_字符串比较函数strcmp的实现

//strcmp(str1,str2)函数比较两个字符串的大小//str1大，返回正数1，str2大，返回负数-1，相等，返回0。#include<iostream>#include<cstdio>#include<cassert>#include<string>using namespace std;int strCmp(const char *str1, const char *str2)//形式参数不容改变{//if(str1==NULL && str2==NULL)//return 0;assert(str1!=NULL && str2!=NULL);//判断字符指针是否是空int res=0;while( !(res = *(unsigned char *)str1 - *(unsigned char *)str2) && *str1){++str1;++str2;}if(res==0)return 0;else if(res>0)return 1;elsereturn -1;//要有返回值}int main(){//char *str[2]={"",""};//char *str[2]={"","a"};//char *str[2]={"a",""};//char *str[2]={"abcde","abcdE"};//char *str[2]={"abc de","abcdE"};char *str[2]={"abcde","abcdefg"};//char *str[2]={"abcdefghij","abcdefg"};cout<<"Input string is: "<<str[0]<<","<<str[1]<<endl;int res=0;res=strCmp(str[0],str[1]);cout<<"Cmpare result is: "<<res<<endl<<endl;system("pause");return 0;}

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