Second largest word of a input string

A simple C program to print the second largest word of a input string using array of pointers

/* to find the second largest word in the sentence and to print it */

#include<stdio.h>

#include<string.h>

#include<malloc.h>

int main()

{

char str[40],*x[10];

int i=0,j=0,tmp,len,t,k,l,leng[20];

printf("\n Enter a string:");

gets(str);

len=strlen(str);

for(i=0;i<=len;i++)

      {

      k=i;

      tmp=0;

      while(str[k]!=' ' && str[k]!='\0')

            {

            k++;

            tmp++;

            if(str[i]=='\n')

            break;

            }

            x[j]=(char *)malloc(tmp*sizeof(char));

            l=0;

                  for(t=i;t<tmp+i;t++)

                  {

                        *(x[j]+l)=str[t];

                        l++;

                  }

                  *(x[j]+l)='\0';

            i=k;

            j++;

            }

for(i=0;i<j;i++)

      {

       leng[i]=(strlen(x[i]));

            //printf("\n [%d] %s",leng[i],x[i]);

      }

for(i=0;i<j-1;i++)

      {

            for(k=i+1;k<j;k++)

                  {

                  if(leng[i]<leng[k])

                        {

                        tmp=leng[k];

                        leng[k]=leng[i];

                        leng[i]=tmp;

                        }

                  }

      }

tmp=leng[1];

if(tmp==leng[0])

      {

      for(i=0;i<j;i++)

            {

            if(tmp==leng[i])

            continue;

            else

                  {

                  tmp=leng[i];

            break;

                  }

            }

      }

puts("\n Second longest words is/are:");

for(i=0;i<j;i++)

      {

            if(tmp==strlen(x[i]))

            printf(" %s ",x[i]);

      }

return 0;

}