CODEWITHSUNDEEP
c++
rajat
rajat

Reputation: 3553

Replace a few characters in a string literal using C++

i have 

cost char* a="test_r.txt"

i want to strip the _r and add _n instead of it so that it becomes "test_n.txt" and save it in const char* b;

what is the easiest way to do it ?

Upvotes: 0

Views: 636

Answers (2)

Uli Klank
Uli Klank

Reputation: 199

Like mentioned before, if you put your const char * into a std::string, you can change your characters. Regarding the replacing of a constant that is longer than one character you can use the find method of std::string:

const char *a =  "test_r_or_anything_without_r.txt";

std::string a_copy(a); 
std::string searching("_r");
std::string replacing("_n");
size_t pos_r = 0;

while (std::string::npos != (pos_r = a_copy.find(searching, pos_r)))
{
    a_copy.replace(a_copy.begin() + pos_r,
                   a_copy.begin() + pos_r + searching.length(),
                   replacing.begin(), replacing.end());
}

const char *b = a_copy.c_str();

Upvotes: 1

Luchian Grigore
Luchian Grigore

Reputation: 258568

You can't directly modify the contents of a, so you'll need some copying:

std::string aux = a;
aux[5] = 'n';
const char* b = aux.c_str();

Upvotes: 5

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