合并两个字符串

将两个字符串连接，不破坏原有字符串

#include<stdio.h>

#include<iostream>

using namespace std;

char* consent(char*s1, char*s2)

{

int len1, len2, len;

char *s;

len1 = strlen(s1);

len2 = strlen(s2);

len = len1 + len2;

s = (char*)malloc(len*sizeof(char)); //必须得先申请地址

int i;

for (i = 0; i < len1; i++)

s[i] = s1[i];

for (i = 0; i < len2; i++)

s[len1 + i] = s2[i];

s[len - 1] = '\0';

return s;

}

void delety(char*s)

{

free(s); //不清楚这样释放内存对不对

cout << "free" << endl;

}

int main()

{

char s1[] = "this is a test ";

char s2[] = "for connecting two string.";

char *s;

s = consent(s1, s2);

cout << s1 << endl;

cout << s2 << endl;

cout << consent(s1, s2) << endl;

delety(s);

return 0;

}