題目:以首位交換的方法交換字符串中以'A'開頭和以'N'結尾的單詞
輸入:AM I OLDER THAN YOU
輸出:THAN I OLDER AM YOU
//輸入:AM I OLDER THAN YOU
//輸出:THAN I OLDER AM YOU
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
void exchange(const char *pIn,char *pOut){
char aa[200];
char temp[10][10],exchange[10];
int num=0,i,j,len;
int head,tail;
while(*pIn!='\0'){//將字符串中的單詞分開存儲在二維數組中 開始
if((*pIn>='a'&&*pIn<='z')||(*pIn>='A'&&*pIn<='Z')){
i=0;
temp[num][i]=*pIn;
i++;
pIn++;
while((*pIn>='a'&&*pIn<='z')||(*pIn>='A'&&*pIn<='Z')){
temp[num][i]=*pIn;
pIn++;
i++;
}
temp[num][i]='\0';
num++;
}else{
pIn++;
}
} //將字符串中的單詞分開存儲在二維數組中 結束
head=0;
tail=num-1;
while(head<tail){
if(temp[head][0]=='A'){
len=strlen(temp[tail]);
if(temp[tail][len-1]=='N'){
strcpy(exchange,temp[head]);
strcpy(temp[head],temp[tail]);
strcpy(temp[tail],exchange);
head++;
tail--;
}else{
tail--;
}
}else{
head++;
}
}
for(i=0;i<num;i++){
strcat(pOut,temp[i]);
strcat(pOut," ");
}
}
int main(){
const char *pIn="AM I OLDER THAN YOU";
char *pOut=calloc(sizeof(strlen(pIn)),1);
exchange(pIn,pOut);
puts(pIn);
puts(pOut);
return 0;
}