16週目アイテム2-ポインタで文字列を回転-(1.1)文字列接続
/*
*Copyright (c)2014,
*All rights reserved.
* :C++.cpp
* :
* :2014 12 7
* :v1.0
*
* :
* :
* :
*/
#include <iostream>
using namespace std;
char *astrcat(char str1[], const char str2[]);
int main(){
char s1[50]="Hello world. ";
char s2[50]="Good morning. ";
char s3[50]="vegetable bird! ";
astrcat(s1,s2);
cout<<" :"<<s1<<endl;
cout<<" :"<<astrcat(s2,s3)<<endl; // char* ,
return 0;
}
// , , ,
// , ,
char *astrcat(char str1[], const char str2[])
{
int i,j;
// : str1[i] *(str1+i),str2[j] ……
for(i=0; str1[i]!='\0'; i++); // str1
for(j=0; str2[j]!='\0'; i++,j++) {
str1[i]=str2[j];
}
str1[i]='\0';// !!
return str1;
}
実行結果: