字符串自实现的拼接

//子实现字符串的拼接
//2017.3.7

#include <stdio.h>
#include <stdlib.h>
void strcat(char *p1, char *p2,int n1,int n2);
int main()
{
    char str1[100] = "dfdfdfdf";
    char str2[200] = "abcdfe";
    char *p1 = str1;
    char *p2 = str2;
    int n1 = 0;
    int n2 = 0;

    strcat(p1, p2,n1,n2);
    printf("拼接完成后的字符串为%s\n", str1);
    system("pause");
    return 1;
}

void strcat(char *p1, char *p2, int n1, int n2)
{
    int i = 0;
    while (*p1 != '\0')
    {
        n1++;
        p1++;
    }
    //此时已经走到字符串str1的末尾
    //遍历字符串str2
    while (*p2 != '\0')
    {
        *(p1) = *(p2 );
        p1++;
        p2++;
    }
    *p1 = '\0';//记住这一句哈
}