字符串逆序翻转

来源：互联网发布：c语言 fabs 编辑：程序博客网时间：2024/04/24 07:17
#include <stdio.h>#include <string.h>void retStr(char* str);int  inversion(char *p,char *bufResult);int  trimSpace(char *inStr,char *outStr);int main(int argc,char* argv[]){char str[] = "    abc  de   fg    ";char outStr[1024];memset(outStr,0,sizeof(outStr));trimSpace(str,outStr);printf("outstr:%s\n",str);printf("outstr:%s\n",outStr);// char str[] = "abcdefg";// char buf[1024];// memset(buf,0,sizeof buf);// // inversion(str,buf);// // printf("buf:%s\n",buf);// retStr(str);// printf("str:%s\n",str);return 0;}//字符串翻转(1)void  retStr(char* str){//必须要显示分配内存int length = strlen(str);char *p1 = str;char *p2 = str + length - 1;while(p1 < p2){char temp = *p1;*p1 = *p2;*p2 = temp;++p1;--p2;}}//通过递归的方式，逆向打印//递归和全局变量（把逆序的结果存入全局变量）//递归和非全局变量（递归指针做函数参数）int inversion(char *p,char *bufResult){if(p == NULL || bufResult == NULL || *p == '\0')//递归结束的异常条件，//递归结束的条件return 0;//递归两点：参数的入栈模型和函数的调用模型inversion(p+1,bufResult);//此时没有执行打印  而是执行了函数调用（重点理解）               //让每一个字符的地址入栈//printf("%c",*p);strncat(bufResult,p,1);return 0;}//通过循环求非空字符串int trimSpace(char *inStr,char *outStr){char *p = inStr;int num = 0;if (inStr == NULL || outStr == NULL){num = -1;printf("func trimSpace()check (inStr == NULL || outStr == NULL)error:%d\n",num);}while(*p++){if(*p == ' ')continue;else{*outStr = *p;outStr++;}}return num;}
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