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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int qsort_compare_str_asc(const void *a, const void *b);
char *s[5]= {"cattle","car","banana","cabet","cap"};
char t[5][100]= {"cattle","car","banana","cabet","cap"};
int main()
{
int i;
printf("s升序排列:\n");
qsort((void*)s, 5, sizeof(char *), qsort_compare_str_asc);
for(i=0; i<5; i++)
printf("%s\n",s[i]);
printf("t升序排列:\n");
qsort((void*)t, 5, sizeof(char *), qsort_compare_str_asc);
for(i=0; i<5; i++)
printf("%s\n",t[i]);
return 0;
}
int qsort_compare_str_asc(const void *a, const void *b)
{
return strcmp(*(char**)a, *(char**)b);
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*---------------------------------------------------------------------
字符指针数组的4个字符串排序函数:升序或降序 and 是否忽略大小写
调用方法:
char *s[5]= {"caTtle","caR","banana","cabet","cap"};
qsort((void*)s, 5, sizeof(char *), 下面所列的4个函数名之一);
---------------------------------------------------------------------*/
int qsort_compare_pstr_asc(const void *a, const void *b);
int qsort_compare_pstr_asc_ignorecase(const void *a, const void *b);
int qsort_compare_pstr_desc(const void *a, const void *b);
int qsort_compare_pstr_desc_ignorecase(const void *a, const void *b);
/*---------------------------------------------------------------------
二位字符数组的4个字符串排序函数:升序或降序 and 是否忽略大小写
调用方法:
char t[5][100]= {"caTtle","caR","banana","cabet","cap"};
qsort(t, 5, 100*sizeof(char), 下面所列的4个函数名之一);
---------------------------------------------------------------------*/
int qsort_compare_chararray_asc(const void *arg1, const void *arg2);
int qsort_compare_chararray_asc_ignorecase(const void *arg1, const void *arg2);
int qsort_compare_chararray_desc(const void *arg1, const void *arg2);
int qsort_compare_chararray_desc_ignorecase(const void *arg1, const void *arg2);
/*---------------------------------------------------------------------
8个字符串排序函数的具体定义
按如下三个标准分成8个函数:(1)字符指针数组 or 二维字符数组
(2)升序 or 降序
(3)是否忽略英文字母的大小写
---------------------------------------------------------------------*/
int qsort_compare_pstr_asc(const void *a, const void *b) /* 字符指针数组、升序、区分大小写 */
{
return strcmp(*(char**)a, *(char**)b);
}
int qsort_compare_pstr_asc_ignorecase(const void *a, const void *b) /* 字符指针数组、升序、忽略大小写 */
{
return stricmp(*(char**)a, *(char**)b);
}
int qsort_compare_pstr_desc(const void *a, const void *b) /* 字符指针数组、降序、区分大小写 */
{
return -strcmp(*(char**)a, *(char**)b);
}
int qsort_compare_pstr_desc_ignorecase(const void *a, const void *b) /* 字符指针数组、降序、忽略大小写 */
{
return -stricmp(*(char**)a, *(char**)b);
}
int qsort_compare_chararray_asc(const void *arg1, const void *arg2) /* 二维字符数组、升序、区分大小写 */
{
return strcmp((char *)arg1, (char *)arg2);
}
int qsort_compare_chararray_asc_ignorecase(const void *arg1, const void *arg2) /* 二维字符数组、升序、忽略大小写 */
{
return stricmp((char *)arg1, (char *)arg2);
}
int qsort_compare_chararray_desc(const void *arg1, const void *arg2) /* 二维字符数组、降序、区分大小写 */
{
return -strcmp((char *)arg1, (char *)arg2);
}
int qsort_compare_chararray_desc_ignorecase(const void *arg1, const void *arg2) /* 二维字符数组、降序、忽略大小写 */
{
return -stricmp((char *)arg1, (char *)arg2);
}
char *s[5]= {"caTtle","caR","banana","cabet","cap"};
char t[5][100]= {"caTtle","caR","banana","cabet","cap"};
int main()
{
int i;
printf("\ns降序排列:\n");
qsort((void*)s, 5, sizeof(char *), qsort_compare_pstr_desc);
for(i=0; i<5; i++)
printf("%s\n",s[i]);
printf("\ns降序排列(忽略大小写):\n");
qsort((void*)s, 5, sizeof(char *), qsort_compare_pstr_desc_ignorecase);
for(i=0; i<5; i++)
printf("%s\n",s[i]);
printf("\ns升序排列:\n");
qsort((void*)s, 5, sizeof(char *), qsort_compare_pstr_asc);
for(i=0; i<5; i++)
printf("%s\n",s[i]);
printf("\ns升序排列(忽略大小写):\n");
qsort((void*)s, 5, sizeof(char *), qsort_compare_pstr_asc_ignorecase);
for(i=0; i<5; i++)
printf("%s\n",s[i]);
printf("\nt降序排列:\n");
qsort(t, 5, 100*sizeof(char), qsort_compare_chararray_desc);
for(i=0; i<5; i++)
printf("%s\n",t[i]);
printf("\nt降序排列(忽略大小写):\n");
qsort(t, 5, 100*sizeof(char), qsort_compare_chararray_desc_ignorecase);
for(i=0; i<5; i++)
printf("%s\n",t[i]);
printf("\nt升序排列:\n");
qsort(t, 5, 100*sizeof(char), qsort_compare_chararray_asc);
for(i=0; i<5; i++)
printf("%s\n",t[i]);
printf("\nt升序排列(忽略大小写):\n");
qsort(t, 5, 100*sizeof(char), qsort_compare_chararray_asc_ignorecase);
for(i=0; i<5; i++)
printf("%s\n",t[i]);
return 0;
}
//文件1中的内容排序并去重,结果保存到文件2中
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAXCHARS 128 //能处理的最大行宽,包括行尾的\n和字符串尾的\0
int MAXLINES=10000,MAXLINES2;
char *buf,*buf2;
int c,n,hh,i,L;
FILE *f;
char ln[MAXCHARS];
int ignore_case=0;
int icompare(const void *arg1,const void *arg2) {
return stricmp((char *)arg1,(char *)arg2);
}
int compare(const void *arg1,const void *arg2) {
return strcmp((char *)arg1,(char *)arg2);
}
int main(int argc,char **argv) {
if (argc<3) {
printf("Unique line. Designed by zhao4zhong1@163.com. 2012-08-20\n");
printf("Usage: %s src.txt uniqued.txt [-i]\n",argv[0]);
return 1;
}
if (argc>3) ignore_case=1;//若存在命令行参数3,忽略大小写
f=fopen(argv[1],"r");
if (NULL==f) {
printf("Can not find file %s!\n",argv[1]);
return 1;
}
buf=(char *)malloc(MAXLINES*MAXCHARS);
if (NULL==buf) {
fclose(f);
printf("Can not malloc(%d LINES*%d CHARS)!\n",MAXLINES,MAXCHARS);
return 2;
}
n=0;
hh=0;
i=0;
while (1) {
if (NULL==fgets(ln,MAXCHARS,f)) break;//
hh++;
L=strlen(ln)-1;
if ('\n'!=ln[L]) {//超长行忽略后面内容
printf("%s Line %d too long(>%d),spilth ignored.\n",argv[1],hh,MAXCHARS);
while (1) {
c=fgetc(f);
if ('\n'==c || EOF==c) break;//
}
}
while (1) {//去掉行尾的'\n'和空格
if ('\n'==ln[L] || ' '==ln[L]) {
ln[L]=0;
L--;
if (L<0) break;//
} else break;//
}
if (L>=0) {
strcpy(buf+i,ln);i+=MAXCHARS;
n++;
if (n>=MAXLINES) {
MAXLINES2=MAXLINES*2;
if (MAXLINES2==1280000) MAXLINES2=2500000;
buf2=(char *)realloc(buf,MAXLINES2*MAXCHARS);
if (NULL==buf2) {
printf("Can not malloc(%d LINES*%d CHARS)!\n",MAXLINES2,MAXCHARS);
printf("WARNING: Lines >%d ignored.\n",MAXLINES);
break;//
}
buf=buf2;
MAXLINES=MAXLINES2;
}
}
}
fclose(f);
if (n>1) {
if (ignore_case) qsort(buf,n,MAXCHARS,icompare);
else qsort(buf,n,MAXCHARS,compare);
}
f=fopen(argv[2],"w");
if (NULL==f) {
free(buf);
printf("Can not create file %s!\n",argv[2]);
return 2;
}
fprintf(f,"%s\n",buf);
if (n>1) {
if (ignore_case) {
hh=0;
L=MAXCHARS;
for (i=1;i<n;i++) {
if (stricmp((const char *)buf+hh,(const char *)buf+L)) {
fprintf(f,"%s\n",buf+L);
}
hh=L;
L+=MAXCHARS;
}
} else {
hh=0;
L=MAXCHARS;
for (i=1;i<n;i++) {
if ( strcmp((const char *)buf+hh,(const char *)buf+L)) {
fprintf(f,"%s\n",buf+L);
}
hh=L;
L+=MAXCHARS;
}
}
}
fclose(f);
free(buf);
return 0;
}