strstr_while模型

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int method()
{
    char *p = "123abcd23sdfwee131abcd12344abcd";
    int ncount = 0;
    
    /*do
    {
    p = strstr(p, "abcd");
    if (p != NULL)
    {
    ncount++;
    p = p + strlen("abcd");
    }
    else
    {
    break;
    }
    } while (*p!='');*/
    

    while (p = strstr(p,"abcd"))
    {
        ncount++;
        p = p + strlen("abcd");
        if (*p=='')
            break;
    }

    printf("ncount:%d
", ncount);
    printf("hello...
");
    system("pause");
    return 0;
}
int getCount(char *mystr/*in*/,char *sub/*in*/, int *ncount)
{
    int ret = 0;
    int tmpCount = 0;
    //初始化让p指针到查找的条件
    char *p = mystr;    //不要轻易改变形参的值
    if (mystr == NULL || sub == NULL || ncount == NULL)
    {
        ret = -1;
        printf("func getCount() err:%d(mystr == NULL || sub || NULL || ncount == NULL)
", ret);
        return ret;
    }

    while (p=strstr(p,sub))
    {
        tmpCount++;
        p = p + strlen(sub);
        if (*p=='')
            break;
    }
    *ncount = tmpCount;    //间接赋值是指针存在的意义
    return ret;
}

int main()
{
    char *p = "abcd1234asd222abcd";
    /*char *sub;
    sub = "abcd";*/
    char sub[] = "abcd";
    int ncount=0;
    int ret = 0;
    
    
    ret = getCount(p,sub,&ncount);
    if (ret != 0)
    {
        printf("func getCount() err：
", ret);
    
    }
    printf("ncount:%d
", ncount);
    
    printf("hello...
");
    system("pause");
    return 0;
}