字符串连接 不使用stract，strlen函数

Question

void main()
{
char s1[80] = "i am li 4,";
char*s2 ="and i am a student";

char *s3;
s3=concateString(s1,s2);
printf("the string after concate:%s\n",s3);
return:
}
我这里面是不是少了几句话

Answer 1

补充如下：

#include <stdio.h>
#include <stdlib.h>

char* concateString(const char* p1,const char* p2)
{
    char* p = (char*)malloc(80);
    char* pt = p;
    while (*p1) { *p = *p1; p++; p1++; }
    while (*p2) { *p = *p2; p++; p2++; }
    *p = '\0';
    return pt;
}
void main()
{
    char s1[80] = "i am li 4,";
    const char* s2 = "and i am a student";

    char* s3;
    s3 = concateString(s1, s2);
    printf("the string after concate:%s\n", s3);
    return;
}