Replacing a character in a string

[Guest_imported]

I need to write a function that will search for a character in a string and replace all occurances of it with another character

Thanks in advance

 

[2ffat]

Hwo are you creating your string, thought char or string? For a character array and most strings, the easiest way is to access an individual character is using the brackets, i.e. [ ]. For example,

char A[10];
.
.
.
for(int x = 0; x<10; ++x)
{
    char Z = A[x];
.
.
.
}

It would be best if x was set to 1 less than the length of the character array. Most string functions can be don the same way. I've also seen string libraries that will search the string for a character and replace it with something else but I suppose that is what you eare trying to do on you own.



James P. Cottingham

http://www.ivcusa.com

All opinions are mine alone and do not necessarily reflect those of my employer.

 

[Guest_imported]

that helps but not for what I need. I have to be able to search for a spacific char lik say all occourances of the char '9' and replace them with a '4'..

 

[2ffat]

What you want to is take the char Z and look at what it is. If Z = '9', then A[x] = '4', or something like that.


James P. Cottingham

http://www.ivcusa.com

All opinions are mine alone and do not necessarily reflect those of my employer.

 

[msteggo]

// before--> character to replace
// after --> character replacing
// pstring --> string sampled
char* replace(char before, char after, char *pstring) {
   for(i=0;i<strlen(pstring);i++) {
      if(pstring[i] == before)
         pstring[i] = after;
   }
   return pstring;
}

 

[DoNotEven]

// Cvert1.cpp Converts text files

#include <iostream.h>
#include <fstream.h>

main(int argc, char *argv[])
{
if(argc!=3) {
cout << &quot;USAGE: CVERT1 <input-filename> <output-filename>\n&quot;;
return 1;
}

ifstream fin(argv[1]);
ofstream fout(argv[2]);
if(!fout) {
cout << &quot;Cannot open output file!\n&quot;;
return 1;
}
if(!fin) {
cout << &quot;Cannot open input file!\n&quot;;
return 1;
}

char ch;

fin.unsetf(ios::skipws);
while(!fin.eof()) {
fin >> ch;
if(ch==' ') ch = '@';
if(ch=='A') ch = '~';
if(ch=='B') ch = '|';
if(ch=='C') ch = '*';
if(ch=='D') ch = '`';
if(ch=='E') ch = 'X';
if(ch=='F') ch = '&amp;';
if(ch=='G') ch = '2';
if(ch=='H') ch = '_';
if(ch=='I') ch = '^';
if(ch=='J') ch = '-';
if(ch=='K') ch = '>';
if(ch=='L') ch = ']';
if(ch=='M') ch = '&quot;';
if(ch=='N') ch = ':';
if(ch=='O') ch = '1';
if(ch=='P') ch = ';';
if(ch=='Q') ch = '<';
if(ch=='R') ch = '?';
if(ch=='S') ch = '=';
if(ch=='T') ch = '%';
if(ch=='U') ch = '#';
if(ch=='V') ch = '}';
if(ch=='W') ch = '+';
if(ch=='X') ch = '{';
if(ch=='Y') ch = '/';
if(ch=='Z') ch = '[';

if(ch=='a') ch = 'F';
if(ch=='b') ch = '0';
if(ch=='c') ch = '6';
if(ch=='d') ch = '3';
if(ch=='e') ch = '9';
if(ch=='f') ch = '5';
if(ch=='g') ch = '4';
if(ch=='h') ch = '7';
if(ch=='i') ch = '8';
if(ch=='j') ch = 'A';
if(ch=='k') ch = 'D';
if(ch=='l') ch = 'J';
if(ch=='m') ch = 'Q';
if(ch=='n') ch = 'E';
if(ch=='o') ch = 'R';
if(ch=='p') ch = 'Y';
if(ch=='q') ch = 'Z';
if(ch=='r') ch = 'K';
if(ch=='s') ch = 'L';
if(ch=='t') ch = 'V';
if(ch=='u') ch = 'M';
if(ch=='v') ch = 'U';
if(ch=='w') ch = 'S';
if(ch=='x') ch = 'B';
if(ch=='y') ch = 'W';
if(ch=='z') ch = 'C';
fout << ch;
}
return 0;
}

Here is a little file I wrote just playing around, and it works.

 

[DoNotEven]

Go to

http://www.kissysoftware.com/download/cvert1.zip

and download this sorce file I wrote that does what you want to do.