String function i.e. Search, Equal ,Smaller, Greater,Getsub,LeftSub,Rightsub , Upper, Lower ,Reverse,Replace
#include #include #include #include String function i.e. Search, Equal ,Smaller, Greater,Getsub,LeftSub,Rightsub , Upper, Lower ,Reverse,Replace  type function int search ( char *, char ) ; int isequals ( char *, char * ) ; int issmaller ( char *, char * ) ; int isgreater ( char *, char * ) ; char * getsub ( char *, int, int ) ; char * leftsub ( char *, int n ) ; char * rightsub ( char *, int n ) ; void upper ( char * ) ; void lower ( char * ) ; void reverse ( char * ) ; int replace ( char *, char, char ) ; int setat ( char *, char, int ) ; void main( ) {  char s1[ ] = "Hello" ;  char s2[ ] = "Hello World" ;  char s3[ ] = "Four hundred thirty two" ;  char ch, *s ;  int i ;  clrscr( ) ;  printf ( "\nString s1: %s", s1 ) ;  /* check for the first occurrence of a character */  printf ( "\nEnter character to search: " ) ;  scanf ( "%c", &ch ) ;  i = search ( s1, ch ) ;  if ( i != -1 )   printf ( "The first occurrence of c...