字符串函數參數傳入傳出（字符串反轉）

/***
strstr.c
***/
#include<stdio.h>
#include<string.h>//求字符串p中abcd出現的次數
//自定義函數接口完成業務函數和main函數分開
int getCount(char *mystr,char *sub,int *ncount)
{int ret = 0;if(mystr == NULL || sub == NULL || ncount == NULL){ret = -1;printf("one of point is NULL\n");return ret;}int tmpCount = 0;char *p = mystr;  //不要輕易改變形參的值do{p = strstr(p,sub);if(p != NULL){tmpCount++;p = p +strlen(sub);}else{break;}}while(*p != '\0');*ncount = tmpCount;   //間接賦值是指針存在的最大意義return ret;
}int main()
{int ret = 0;char *p = "abcd11122abcd3333abcd3456abc";int count = 0;char sub[] = "abcd";ret = getCount(p,sub,&count);if(ret != 0){printf("getCount error ret:%d\n",ret);return ret;}printf("count:%d\n",count);return 0;
}

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