字符串函数参数传入传出（去空格）

字符串作为函数参数传入传出

/***
delSpace.c
***/
#include<stdio.h>
#include<string.h>int DelSpace(char *str)
{int iRet = -1;int i ;int j ;int ncount = 0;char *out = str;if(NULL == str ){printf("the point in is NULL\n");return iRet;}i = 0;j = strlen(out) - 1;while(isspace(out[i]) && out[i] != '\0'){i++;}while(isspace(out[j]) && out[j] != '\0'){j--;    }ncount = j - i + 1;strncpy(out,out+i,ncount);  //所有指向的地址空间是不能修改的 out[ncount] = '\0';iRet = 0;return iRet;
}int main()
{int iRet = -1;//char *p = "   abcdefg     ";  //分配的地址内存位于常量区 char buf[256] = "     abcdefd    ";  //这块内存空间分配在临时区栈区，可以进行修改。buf这个变量名是不允许修改的//iRet = DelSpace(p);iRet = DelSpace(buf);if(0 == iRet)printf("DelSpace success p = %s\n",buf);elseprintf("DelSpace error p = %s\n",buf);return 0;
}

分为两个字符串传入传出

#include<stdio.h>
#include<string.h>int trimSpace(char *in,char *out)
{int iRet = -1;int i = 0;int j = 0;int k = 0;char *tempIn = in;if(in == NULL || out == NULL){printf("NULL is error\n");return iRet;}i = 0;j = strlen(tempIn) - 1;while(isspace(tempIn[i]) && tempIn[i] != '\0'){i++;}while(isspace(tempIn[j]) && tempIn[j] != '\0'){j--;}while(i <= j){out[k++] = tempIn[i++];}out[k] = '\0';iRet = 0;return iRet;
}int main()
{int iRet = -1;char *p = "  abcf   ";char buf[256] = {0};iRet = trimSpace(p,buf);if(iRet != 0){printf("trimSpace error\n");}else{printf("trimSpace success\n");}printf("buf = %s\n",buf);return 0;}