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[ 本帖最后由 xiaowh00 于 2012-08-10 16:59 编辑 ]
谢谢回复，原因我已经找到了，是我判断的逻辑错误了，现在我的基本功能已经实现了，但是还有一个问题，就是我测试各个功能的时候，没法往回测试了
在各个函数中，我怎么声明一个局部变量来保存 void print_ascii(char *str[],int n)中的char *str[]。
比如我输入
aaa
bb
输入1，按照原来的顺序输出，然后在输入2，按照ascii输出，但是当我在输入1的时候，没法按照原来的输出了,我是觉得应该在每个函数中声明一个局部变量来保存传递过来的char *str[],但是我不知道怎么做，请高手指点？
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define MAX 5
#define LEN 100
// Write a program that reads in up to 10 strings or to EOF, whichever comes first. Have it offer the user a menu with five choices: print the original list of strings, print the strings in ASCII collating sequence, print the strings in order of increasing length, print the strings in order of the length of the first word in the string, and quit. Have the menu recycle until the user enters the quit request. The program, of course, should actually perform the promised tasks.
void menu(void);
void print_original(char *[],int);
void print_ascii(char *[],int);
void print_all_length(char *[],int);
void print_first_length(char *[],int);
int main(void)
{
char input[MAX][LEN];
char *ptr[MAX];
int count=0;
int choice;
printf("Input some strings (less than %d)\n",MAX);
while(count<MAX && gets(input[count])!=NULL && input[count][0]!=EOF)
{
ptr[count]=input[count];
count++;
}
while(menu(),scanf("%d",&choice)==1)
{
switch(choice)
{
case 1 : print_original(ptr,count);
break;
case 2 : print_ascii(ptr,count);
break;
case 3 : print_all_length(ptr,count);
break;
case 4 : print_first_length(ptr,count);
break;
case 5 : return 0;
break;
default : continue;
}
}
return 0;
}
void menu(void)
{
printf("========================================================================\n");
printf(" 1) print the original list of strings\n");
printf(" 2) print the strings in ASCII collating sequence\n");
printf(" 3) print the strings in order of increasing length\n");
printf(" 4) print the strings in order of the length of the first word in string\n");
printf(" 5) quit\n");
printf("========================================================================\n");
}
void print_original(char *str[],int n)
{
int i=0;
while(i<n)
puts(str[i++]);
}
void print_ascii(char *str[],int n)
{
int i,j;
char *temp;
for(i=0;i<n;i++)
for(j=i;j<n;j++)
if(strcmp(str[i],str[j])>0)
{
temp=str[i];
str[i]=str[j];
str[j]=temp;
}
for(i=0;i<n;i++)
puts(str[i]);
}
void print_all_length(char *str[],int n)
{
int i,j;
char *temp;
for(i=0;i<n;i++)
for(j=i;j<n;j++)
if(strlen(str[i])>strlen(str[j]))
{
temp=str[i];
str[i]=str[j];
str[j]=temp;
}
for(i=0;i<n;i++)
puts(str[i]);
}
void print_first_length(char *str[],int n)
{
int len[n];
int i,j;
char *start,*end,*temp;
for(i=0;i<n;i++)
{
temp=str[i];
if(isspace(*temp))
{
while(isspace(*temp))
temp++;
start=temp;
for(;;temp=str[i]+1)
{
if(isspace(*temp) || *temp=='\0')
{
end=temp;
break;
}
}
}
else
{
start=temp;
for(;;temp++)
{
if(isspace(*temp) || *temp=='\0')
{
end=temp;
break;
}
}
}
len[i]=end-start;
}
for(i=0;i<n;i++)
printf("%d\n",len[i]);
for(i=0;i<n;i++)
for(j=i;j<n;j++)
if(len[i]>len[j])
{
temp=str[i];
str[i]=str[j];
str[j]=temp;
}
for(i=0;i<n;i++)
puts(str[i]);
}
[b]回复 [url=forum.php?mod=redirect&goto=findpost&pid=&ptid=3764297]2#[/url] [color=Olive]lenky0401[/color] [/b]
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发表于 2012-08-10 10:57
发表于 2012-08-10 16:25
