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Given an array of characters which form a sentence of
words, give an efficient algorithm to reverse the order of
the words (not characters) in it.

Answer Posted / vijay

#include<stdio.h>
main()
{
int i=0,j=0,start=0,end=0,len,w_len;
char temp;
char str[]="Papa Kehte HAIN bada naam karega";
printf("Before reversing the words string is %s \n",str);
len=strlen(str);
for(i=0,j=len-1;i<j;i++,j--)
{
temp=str[j];
str[j]=str[i];
str[i]=temp;
}
for(i=0,j=0;str[i]!=0;)
{
i=j;
for(;str[i]!=' '&& i<len;)
i++;
w_len=(i-j)-1;

for(start=j,end=(start+w_len);start<end;start++,end--)
{
temp=str[start];
str[start]=str[end];
str[end]=temp;
}
j=i+1;
}
printf("After reversing the words string is %s \n",str);
}

Is This Answer Correct ?    4 Yes 1 No



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