strcat的实现

#include <iostream>
#include <assert.h>
using namespace std;

/*
 字符串的拼接
 */
char *str_cat(char *des, const char* src){
    assert((des!=NULL)&&(src!=NULL));//在开始之前先保证des，src2个地址是有效的
    char *temp = des;
    while(*des!='\0') des++;
    while ((*des++ = *src++)!='\0');
    return temp;
}
int main(int argc, const char * argv[]) {
    // insert code here...
    char name[20] = "scott";
    const char* last = "xiong";
    cout<< str_cat(name, last)<<endl; //scottxiong
    return 0;
}