Replace a word in C - c

Question

can you advice me? I have a string from a file. When i see the string on my console, i need to write the word on which i want to change, and output the result in another file. For example: "Hello my girl" the word i want change "girl" on another word "boy". I can use the library
Can you advice me the algorithm which helps me to change the word?
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
char my_string[256];
char* ptr;
FILE *f;
if ((f = fopen("test.txt", "r"))==NULL) {
printf("Cannot open test file.\n");
exit(1);}
FILE *out;
if((out=fopen("result.txt","w"))==NULL){
printf("ERROR\n");
exit(1);
}
fgets (my_string,256,f);
printf ("result: %s\n",my_string);
ptr = strtok (my_string," ");
while (ptr != NULL)
{
printf ("%s \n",ptr);
ptr = strtok (NULL," ");
}
char old_word [10];
char new_word [10];
char* ptr_old;
char* ptr_new;
printf ("Enter your old word:\n");
ptr_old= gets (old_word);
printf ("Your old word:%s\n",old_word);
printf ("Enter new old word:\n");
ptr_new = gets (new_word);
printf ("Your new word:%s\n",new_word);
fclose(f);
fclose(out);
return 0;
}
i tried to split inputting string into words. Now its dead end.

Answer 1

This code will help you. you have to pass 4 args at runtime.
./a.out "oldword" "newword" "file name from take the old word" "file name where to copy"
$ ./a.out girl boy test.txt result.txt
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int args, char *argv[4])
{
FILE *f1;
FILE *f2;
char *strings=0;
char *newstrings=0;
char *token=NULL;
strings=(char *)malloc(1000);
newstrings=(char *)malloc(1000);
if((strings==NULL)||(newstrings==NULL))
{
printf("Memory allocation was not successfull.");
return 0;
}
if(args<4)
{
puts("Error: Not enough input parameters");
puts("Usage: ./change <oldword> <newword> <infile> <newfile>");
return 0;
}
f1=fopen(argv[3],"r");
f2=fopen(argv[4],"w");
if(f1==NULL)
{
puts("No such file exists");
return 0;
}
while(fgets(strings,1000,f1)!=NULL)
{
if(strstr(strings,argv[1])!=NULL)
{
token=strtok(strings,"\n\t ");
while(token!=NULL)
{
if(strcmp(token,argv[1])==0)
{
strcat(newstrings,argv[2]);
strcat(newstrings," ");
}
else
{
strcat(newstrings,token);
strcat(newstrings," ");
}
token=strtok(NULL,"\n\t ");
}
}
else
{
strcpy(newstrings,strings);
}
fputs(newstrings,f2);
}
free(strings);
free(newstrings);
printf("New file <%s> generated!\n",argv[4]);
fclose(f1);
fclose(f2);
return 0;
}

Answer 2

You can use a function like the shown function in the demonstrative program below
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
char * replace(const char *s, const char *src, const char *dsn)
{
size_t n = 0;
size_t src_len = strlen(src);
size_t dsn_len = strlen(dsn);
for (const char *p = s; (p = strstr(p, src)) != NULL; p += src_len)
{
n++;
}
char *result = malloc(strlen(s) + n * (src_len - dsn_len) + 1);
const char *p = s;
char *t = result;
if (n != 0)
{
for (const char *q; (q = strstr(p, src)) != NULL; p = q + src_len)
{
memcpy(t, p, q - p);
t += q - p;
memcpy(t, dsn, dsn_len);
t += dsn_len;
}
}
strcpy(t, p);
return result;
}
int main( void )
{
char s[] = " the girl and boy are relatives";
char *p = replace(s, "girl", "boy");
puts(s);
puts(p);
free(p);
}
The program output is
the girl and boy are relatives
the boy and boy are relatives

Answer 3

#include <stdio.h>
#include <string.h>
int main ()
{
char file_path[40] = { 0 }, stf[255] = { 0 }, rtf[255] = { 0 }, str[255] = { 0 };
FILE* file = NULL;
FILE *e_f;
if((e_f=fopen("result.txt","w"))==NULL){
printf("ERROR\n");
exit(1);
}
do
{
printf("Enter file path: ");
fgets(file_path, 40, stdin);
file_path[strlen(file_path) - 1] = '\0';
file = fopen(file_path, "r+");
}
while(file == NULL);
printf("Enter text to find: ");
fgets(stf, 255, stdin);
stf[strlen(stf) - 1] = '\0';
printf("Enter text to replace: ");
fgets(rtf, 255, stdin);
rtf[strlen(rtf) - 1] = '\0';
while(fgets(str, 255, file) != NULL)
{
char* tmp_ptr = strstr(str, stf);
while(tmp_ptr != NULL)
{
char tmp_str[255];
strcpy(tmp_str, tmp_ptr + strlen(stf));
strcpy(str + strlen(str) - strlen(tmp_ptr), rtf);
strcat(str, tmp_str);
tmp_ptr = strstr(str, stf);
}
printf("%s", str);
}
fclose(file);
fclose(e_f);
return 0;
}
That was i need. Thanks everybody for helping!

Answer 4

I did a function:
#include <stdio.h>
#include <string.h>
#define MAX 50
void Change (char x[], char cx, char nu){
int i;
for(i=0;i<strlen(x);i++) {
if (x[i]==cx){
x[i] = nu;
}
}
}
int main () {
char str[MAX];
char ch;
char new;
printf("Insert the string\n");
scanf("%s",str);
printf("Insert the word that you want to change\n");
scanf(" %c",&ch);
printf("the new word\n");
scanf(" %c",&new);
Change(str, ch, new);
printf("The new word is %s\n",str );
return 0;
}