/*word wrap*/

Code:

#include<stdio.h>
int isspace(int);
int main()
{
    int len;
    int i,a=0;
char s[] = "Cat jumped over the moon. Does this work ? its cool n wonderful";
    printf("%s \n",s);
  printf("\n enter the no chars u want in a line:\n");
  scanf("%d",&i);
  int linechars = i;    
  len=strlen(s);

  for(;i<=len;) {     

    // Read i chars    
    while(i!=0 && i<=len) 
    {
      if(isspace(s[i]))
      {
             s[i]='\n';
         break;       
      }
      
      i--;    
    }
    i += (linechars);
        
  }
    printf("%s \n",s);    
    return 0;
}

int isspace( int i)
{
    if(i==' ')
      return 1;
    else 
      return 0;
}

And your question is?