Thread: C code for reverse the order of words in a string

Hi. I am learning C programming language. Anybody knows how to reverse the order of words in a string. If you have any in code please let me know that. Thanks in advanced.

Refer following program to reverse the order of words in a string:

Code:

#include <stdio.h>
#include <string.h>
char string[20];
void strrev(char *start, char* end)
{
 char temp;
 
 if( !start || !end ) //null pointer check
  return;
 
 for(; start<=end; start++, end-- )
 {
  temp = *start;
  *start = *end;
  *end = temp;
 }
}
 
int main()
{
 char* tempstr = string;
 char* tempstr2;
 printf("Enter the string with words: ");
 scanf("%[^n]s", string);
 strrev( tempstr, tempstr+strlen(tempstr)-1 );
 printf( "%sn", tempstr, string );
 while( *tempstr!=0 )
 {
  tempstr2 = tempstr;
  while( tempstr2 && (*tempstr2!=' ' && *tempstr2!=0) )
    tempstr2++;
  strrev( tempstr, tempstr2-1 );
  tempstr = tempstr2+1;
 }
 printf( "%sn", string );
}

I have tried the given code but it didn’t solve my problem. Please try to provide some other solution.

Try this code:

Code:

string s = "box is red"; //Input string
string t = ""; //Output string
string w = "";
for (int i = 0; i < s.Length; i++)
{ 
if (s[i] == ' ')
{
t += w + ' ';
w = "";
}
else w += s[i];
}
t+= w; //Get the last word of string if there is not a ' ' at the end of input string