CareerCup

int main()
{
 int i, j;
 char * str = (char *)malloc(256);
 
 printf("get string :");
 scanf("%s", str);

 // first reverse entire string
 revere_string(str, 0, strlen(str) - 1);

 for(i = 0; i < strlen(str) - 1;)
 {
   // skip spaces, tabs & nul's
   while(str[i] == 0x00 || str[i] == 0x20 || str[i] == '\t')
   {
      i++;
   }
   // mark start of alpha-num char
   j = i++;

   // find end of alpha-num word
   while(!(str[i] == 0x00 || str[i] == 0x20 || str[i] == '\t'))
   {
      i++;
   }
   // reverse the word
   reverse_string(str, j, i - 1);
 }
 puts("after word by word reversal :");
 puts(str);
}

Stack of words will solve the problem. e.g., take stack<string> and take space as a delimiter, --> start pushing the words and the popup again to reverse the word order.

int main() {
const char * s = " he is a geek ";

int len = strlen(s);
int i = len-1;
int j;

while (1) {
while (i>=0 && s[i] == ' ') i--;
if (i<0) break;

j=i;
while (i>=0 && s[i] != ' ') i--;
for (int k=i+1; k<=j; k++) printf("%c", s[k]);
printf(" ");
}
printf("\n");
}