Program C za zamenjavo besede v besedilu z drugo dano besedo
Podani so trije nizi 'str' 'oldW' in 'newW'. Naloga je najti vse pojavitve besede 'oldW' in nato zamenjati z besedo 'newW'. Primeri:
Input : str[] = 'xxforxx xx for xx' oldW[] = 'xx' newW[] = 'geeks' Output : geeksforgeeks geeks for geeksPriporočeno: prosimo, rešite ga na VADITE preden nadaljujete z rešitvijo.
Ideja je prečkati izvirni niz in prešteti, kolikokrat se stara beseda pojavi v nizu. Sedaj naredite nov niz zadostne velikosti, da bo mogoče zamenjati novo besedo. Zdaj kopirajte izvirni niz v nov niz z zamenjavo besede.
Izvedba:
C // C program to search and replace // all occurrences of a word with // other word. #include #include #include // Function to replace a string with another // string char * replaceWord ( const char * s const char * oldW const char * newW ) { char * result ; int i cnt = 0 ; int newWlen = strlen ( newW ); int oldWlen = strlen ( oldW ); // Counting the number of times old word // occur in the string for ( i = 0 ; s [ i ] != ' ' ; i ++ ) { if ( strstr ( & s [ i ] oldW ) == & s [ i ]) { cnt ++ ; // Jumping to index after the old word. i += oldWlen - 1 ; } } // Making new string of enough length result = ( char * ) malloc ( i + cnt * ( newWlen - oldWlen ) + 1 ); i = 0 ; while ( * s ) { // compare the substring with the result if ( strstr ( s oldW ) == s ) { strcpy ( & result [ i ] newW ); i += newWlen ; s += oldWlen ; } else result [ i ++ ] = * s ++ ; } result [ i ] = ' ' ; return result ; } // Driver Program int main () { char str [] = 'xxforxx xx for xx' ; char c [] = 'xx' ; char d [] = 'Geeks' ; char * result = NULL ; // oldW string printf ( 'Old string: %s n ' str ); result = replaceWord ( str c d ); printf ( 'New String: %s n ' result ); free ( result ); return 0 ; }
Izhod: Old string: xxforxx xx for xx New String: GeeksforGeeks Geeks for Geeks
Časovna zapletenost : O(n)
Pomožni prostor: O(n)
2. način: Ta metoda vključuje posodobitev niza na mestu. Učinkovitejši je, saj porabi samo dodaten prostor za vstavljanje novih znakov.
Izvedba:
C // C Program to replace a word in a text by another given // word by inplace updation #include #include #include void replaceWord ( char * str char * oldWord char * newWord ) { char * pos temp [ 1000 ]; int index = 0 ; int owlen ; owlen = strlen ( oldWord ); // Repeat This loop until all occurrences are replaced. while (( pos = strstr ( str oldWord )) != NULL ) { // Bakup current line strcpy ( temp str ); // Index of current found word index = pos - str ; // Terminate str after word found index str [ index ] = ' ' ; // Concatenate str with new word strcat ( str newWord ); // Concatenate str with remaining words after // oldword found index. strcat ( str temp + index + owlen ); } } int main () { char str [ 1000 ] oldWord [ 100 ] newWord [ 100 ]; printf ( 'Enter the string: ' ); gets ( str ); printf ( 'Enter the word to be replaced: ' ); gets ( oldWord ); printf ( 'Replace with: ' ); gets ( newWord ); replaceWord ( str oldWord newWord ); printf ( ' n Modified string: %s' str ); return 0 ; }
Vnos: 1 xxforxx xx for xx xx geeksIzhod:
geeksforgeeks geeks for geeks
Časovna zahtevnost: O(n)
Pomožni prostor: O(1)
