CODEWITHSUNDEEP
c++stringvisual-studio-2010visual-c++
rain
rain

Reputation: 403

Find the index of a special character in string in C++

I wanna know if there is any standard function in visual stodio 2010, C++, which takes a character, and returns the index of it in special string, if it is exist in the string. Tnx

Upvotes: 5

Views: 31248

Answers (4)

Pablo Santa Cruz
Pablo Santa Cruz

Reputation: 181280

You can use std::strchr.

If you have a C like string:

const char *s = "hello, weird + char.";
strchr(s, '+'); // will return 13, which is '+' position within string

If you have a std::string instance:

std::string s = "hello, weird + char.";
strchr(s.c_str(), '+'); // 13!

With a std::string you can also a method on it to find the character you are looking for.

Upvotes: 4

João Víctor
João Víctor

Reputation: 1771

#include <iostream>
#include <string>
#include <algorithm>

using namespace std;

int main() {
    string text = "this is a sample string";
    string target = "sample";

    int idx = text.find(target);

    if (idx!=string::npos) {
        cout << "find at index: " << idx << endl;
    } else {
        cout << "not found" << endl;
    }

    return 0;
}

Upvotes: 2

DanS
DanS

Reputation: 1797

strchr() returns a pointer to the character in the string.

const char *s = "hello, weird + char."; 
char *pc = strchr(s, '+'); // returns a pointer to '+' in the string
int idx = pc - s; // idx 13, which is '+' position within string

Upvotes: 2

NPE
NPE

Reputation: 500317

strchr or std::string::find, depending on the type of string?

Upvotes: 3

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