一个简单的单词统计程序, 问题来源: http://topic.csdn.net/u/20111114/10/2e439bbf-04c5-4042-9905-ece0bf008b97.html
/* 功能:实现单词统计功能
*/#include <stdio.h>
#include <string.h>main()
{char *t[20]; // 声明一个指针数组,长度为20char (*t2)[20]; // 声明一个指针,该指针指向含20个元素的数组printf("%d: %x, %x\n", sizeof(t), t, t+1);printf("%d: %x, %x\n\n", sizeof(t2), t2, t2+1);//return 0;int i=0,j=0,nLen;char *p,*q,str[]="My ti* me is! limi#ted.",words[100][20];memset(words,'\0',sizeof(words));p=str;while (*p){//if (*p==' ' || *p=='!' || *p==',' || *p=='.' || *p=='?')if(!(isalpha(*p) || isdigit(*p))) // 不是字母也不是数字,则为一个单词的结束{if(j > 0) // 当前单词长度不为空{words[i++][j]='\0';j=0;}}else{if (j==0 && (*p >= 'a' && *p <= 'z')){words[i][j++]=*p - 32; // 将单词首字母变成大写}else{words[i][j++]=*p;} }p++;}// 法一:用pp=words[0];while (strlen(p) > 0) // 用p{printf("p: %x\t%s\n", p, p);p += 20;}printf("\n");// 法二:用p2char (*p2)[20] = words;while (strlen((const char*)p2) > 0) // 用p2{printf("p2: %x\t%s\n", p2, p2);p2++;}printf("\n");//法三:用wordsi = -1;while (strlen(words[++i]) > 0) // 用words{printf("wrods[%d]: %s\n", i, words[i]);}
}
编译运行:
[zcm@t #109]$make
gcc -g -c -o a.o a.c
gcc -g -o a a.o
[zcm@t #110]$./a
80: bfb5d554, bfb5d558
4: 8049a08, 8049a1cp: bfb5cd6c My
p: bfb5cd80 Ti
p: bfb5cd94 Me
p: bfb5cda8 Is
p: bfb5cdbc Limi
p: bfb5cdd0 Tedp2: bfb5cd6c My
p2: bfb5cd80 Ti
p2: bfb5cd94 Me
p2: bfb5cda8 Is
p2: bfb5cdbc Limi
p2: bfb5cdd0 Tedwrods[0]: My
wrods[1]: Ti
wrods[2]: Me
wrods[3]: Is
wrods[4]: Limi
wrods[5]: Ted
[zcm@t #111]$