CODEWITHSUNDEEP
c++arrayspointerscharint
kabuzashi
kabuzashi

Reputation: 21

C++ - Inserting and Extracting Characters from an Integer Array

For example:

char mem[100000];

int reg[8];

mem[36] = 'p';         // add char p to our 36th index of our char array

reg[3] = (int)mem[36]; // store value of mem[36] into reg[3]

But I am still getting weird values and characters when trying to print it out.

From my understanding, an integer is equal to 4 characters. Since a character is technically a byte and an integer is 4 bytes.

So I am storing a character into my integer array as 4 bytes, but when I pull it out, there is garbage data since the character I inserted is only one byte compared to the index being 4 bytes in size.

Upvotes: 2

Views: 2021

Answers (3)

Artemy Vysotsky
Artemy Vysotsky

Reputation: 2734

I do not see what is your problem. You store the char into int var. You want to print it back - just cast the value to char and print it

#include <iostream>

int main()
{
    char mem[100];

    int reg[8];

    mem[36] = 'p';         // add char p to our 36th index of our char array

    // store value of mem[36] into reg[3]
    reg[3] = mem[36]; 

    // store value of mem[36] into reg[4] with cast
    reg[4] = static_cast<int>(mem[36]); 

    std::cout << static_cast<char>(reg[3]) << '\n';
    std::cout << static_cast<char>(reg[4]) << '\n';

}

/****************
 * Output
$ ./test
p
p
*/

Upvotes: 0

CAMD_3441
CAMD_3441

Reputation: 3154

Have you tried this:

char mem[100000];
int reg[8];
mem[36] = 'p';         // add char p to our 36th index of our char array
reg[3] = (int)mem[36]; // store value of mem[36] into reg[3]
char txt[16];
sprintf(txt, "%c", reg[3]);  // assigns the value as a char to txt array
cout<<txt<<endl;

This prints out the value 'p'

Upvotes: 1

frslm
frslm

Reputation: 2978

You shouldn't be using pointers here; it's sufficient to work with chars:

char c = reg[3];
cout << c << endl;

Note, however, that you could lose information when trying to stuff an int into a char variable.

Upvotes: 0

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