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Why does the storage size of a char seem to change?


Why does the storage size of a char seem to change?

By : none none
Date : November 17 2020, 04:28 AM
I hope this helps . Because you are are marshaling, and by default, a char will get marshalled to an ANSI char instead of a Unicode char. So "balloon" is 8 characters, which is 8 bytes when ANSI encoded, plus 4 bytes for your int, which is 12.
If you want the size to be 20 for marshalling, change your StructLayout and set the ChatSet to Unicode:
code :
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode, Pack = 1)]


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Do I need to change the size of my char pointer every time I change its content?

Do I need to change the size of my char pointer every time I change its content?


By : ashish shirke
Date : March 29 2020, 07:55 AM
wish helps you It works because you're lucky. Writing past the end of a buffer is a good way to damage the data following that buffer and cause your program to blow up in nasty ways.
Actually you were lucky even the first time. Sizeof returns the size of the variable's type, which is a pointer, NOT the length of the string. And even if you'd used strlen(string1) you'd have to also add 1 to allow space for the null character which terminates the string.
Reallocating a 2d array if initialized like so: char (*A)[size] = malloc(sizeof(char[size][size]))

Reallocating a 2d array if initialized like so: char (*A)[size] = malloc(sizeof(char[size][size]))


By : Chloe Paul
Date : March 29 2020, 07:55 AM
seems to work fine My suggestion to separate the histogram display parts so as to use a dynamic array input data array.
code :
#include <stdio.h>
#include <stdlib.h>

#define MAX_DATA_SIZE 80 //console width is 80 :)

void histogram(int n, int data[n], int max){
    char (*disp)[n+1] = malloc(sizeof(char [max+1][n+1]));//Area for display is actually not required.
    int r,c;
    for(r = 0;r <= max; ++r){
        for(c = 0; c <= n; ++c){
            if(c == 0){
                if(r == 0)
                    disp[r][c] = '+';
                else
                    disp[r][c] = '|';
            } else if(r == 0){
                disp[r][c] = '-';
            } else {
                disp[r][c] = r <= data[c-1] ? '*' : ' ';
            }
        }
    }
    for(r = max; r>=0;--r){
        for(c =0;c<=n;++c)
            printf("%c", disp[r][c]);
        printf("\n");
    }
}

int main(void){
    int data[MAX_DATA_SIZE], max_data = 0;
    char input_line[128];
    int data_size = 0;
    while(fgets(input_line, sizeof(input_line), stdin)){
        if(sscanf(input_line, "%d", &data[data_size])==1){
            if(data[data_size] > max_data)
                max_data = data[data_size];
            if(++data_size == MAX_DATA_SIZE)
                break;//or malloc & realloc ?
        }
    }
    histogram(data_size, data, max_data);
    return 0;
}
Aerospike - change storage type and size

Aerospike - change storage type and size


By : Paresh Pandit
Date : March 29 2020, 07:55 AM
I wish this help you For data-in-memory true, you can simply change to false and restart the asd daemon. Rolling restart will work (one node at a time), so no down time.
memory-size is actually dynamically configurable: see doc
char ** should I malloc size of (char*) or size of char * string length?

char ** should I malloc size of (char*) or size of char * string length?


By : Martin Wu
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further ips points to an array of char *, so its buffer must be a multiple of sizeof(char *), not a multiple of sizeof(char).
fgets where the number of char read is bigger than the size of the storage

fgets where the number of char read is bigger than the size of the storage


By : boney M
Date : March 29 2020, 07:55 AM
I wish this helpful for you fgets(str, 200, fi); is indeed wrong, because it is telling fgets to read up to 199 characters when in reality str can store up to 79 characters (not including the '\0'-terminating byte), that's why it "works"1 with fgets(str, 80, fi);.
In general it's a good idea to use sizeof like this2:
code :
char str[80];
fgets(str, sizeof str, fi);
while(!feof(fi))
{
    ...
}
while(fgets(str, sizeof str, fi))
{
    // do things
}
size_t len = 80;
char *str = malloc(len);
if(str == NULL)
{
    // error handling
}

fgets(str, len, fi); // <-- do not use sizeof here, but the variable
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