CODEWITHSUNDEEP
c++
AlexD4K
AlexD4K

Reputation: 21

How do I turn an integer into a string?

I want to write like this:

int x;
cin >> x;
if (x == 10) {
x = "A";
}

But I get this error message "error: invalid conversion from 'const char*' to 'int'"

Upvotes: 0

Views: 82

Answers (2)

David C. Rankin
David C. Rankin

Reputation: 84642

From your comment below the first answer, if you are converting to a hexadecimal string, you can do it directly with std::sprintf() and a plain old C-string. See std::printf, std::fprintf, std::sprintf, std::snprintf. You can do:

#include <iostream>

#define MAXHEXSTR 36

int main (void) {
    
    uint16_t u = 65535;
    char hexstr[MAXHEXSTR] = "";
    
    std::sprintf (hexstr, "0x%04x", u);
    std::cout << hexstr << '\n';
}

You can adjust the format string to meet your needs. Above it just formats the 16-bit value with a "0x" prefix and the conversion yields a 4-byte hex representation of the value zero padded as needed.

Example Use/Output

$ ./bin/hexstrprintf
0xffff

or

A value of ten would yield:

$ ./bin/hexstrprintf
0x000a

Let me know if you have further questions.

Upvotes: 0

Alexander Maahs
Alexander Maahs

Reputation: 56

C++ has something called type checking, which basically means that you can't change the type of a variable (so if you define x as an int, you can't redefine it to a string). If you want to save the value of x as a string, you could do the following:

int x = 5;
std::string xAsString = std::to_string(x);

As a side note, you should use == in your if-statement to check whether two things are equal.

Upvotes: 3

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