For Eg:
Input: this is a simple c program
Output: program c simple a is this
The LOGIC part:
-First determine the length of the string. Use a simple for loop
until you find '\0' else use an inbuilt string function 'strlen()' like I have used.
-then move over to the last word in your string.
Place a pointer at the end of the last word and then find the
space before that word and place a pointer after the space
and using these two pointer append the word to a new string.
-Repeat procedure for all words from last word to first word.
SOURCE CODE:
#include <stdio.h>
#include <stdlib.h>
int main()
{
char str[100], rev[100];
int i, j, k, m, n, len, c=0, flag=1;
printf("\nEnter a sentence: ");
gets(str);
printf("\nEntered sentence: ");
puts(str);
len = strlen(str)-1; //length of string except \0
i=0;
j=len;
k=0;
while(flag==1) //while more words to process
{
flag = 1;
i=j; //pointer i, j to end of current word
while(str[i] != ' ') //decrement pointer i till beginning of current word
{
if(i==0)
{
flag = 0; //special case for 1st word of the sentence
break;
}
i--;
}
m=i;
if(flag)
{
i=i+1;
}
for( ; i<=j; ) //append current word to new char array
{
rev[k++] = str[i++];
}
j=m-1; //move pointer j to end of previous word
rev[k++]=' ';
}
rev[k]='\0';
printf("\nReverse sentence: ");
puts(rev);
printf("\n");
return 1;
}
SAMPLE OUTPUT:
