9,649 questions
1
vote
1
answer
145
views
Format() Entire Strings (Rather Than Characters)
Background
VBA has a Format() function which converts any value to its textual representation. This is useful for numbers and Dates and times, but it can also be used on Strings.
Debug.Print Format(&...
- 3,368
0
votes
1
answer
68
views
Printf command stops working when DEBUG trap is active?
When I set a DEBUG trap in Bash like this:
set -o functrace
trap 'echo "# $BASH_COMMAND" >&2' DEBUG
Suddenly, this function stopped working:
getBase() {
local base="$1"
...
- 9,594
13
votes
3
answers
2k
views
Why does a mismatching printf specifier also affect subsequent arguments?
I have a very simple C program where I am printing variables of different sizes.
#include <stdio.h>
unsigned int long long a;
unsigned int c;
int main() {
a = 0x1111111122222222;
c = ...
- 1,602
4
votes
1
answer
127
views
how to implement syscalls with newlib nano
im trying to implement syscalls for printf so i defined the functions :
#include <stdint.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
void usart_init(...
- 81
12
votes
4
answers
2k
views
How does printing a union itself and not its member work in C?
I'm making a hashtable in C that I want to contain elements of different types, so I made it return a union that can hold int, float or char *. But when trying to print the union itself out, float ...
- 123
1
vote
1
answer
99
views
printf (inside C code) called from python in google colab. (no output)
printf doesn't output anything
google colab cell:
%%writefile my_functions.c
#include <stdio.h>
#include <stdlib.h>
void my_void_func() {
printf("my_void_func called from C!\n");
...
- 185
3
votes
0
answers
261
views
Is it possible to disable some print format specifiers? the embedded system i'm working with does not support string output
logging interface is in the header
https://gitee.com/openharmony/hiviewdfx_hilog_lite/blob/master/interfaces/native/kits/hilog_lite/hiview_log.h
the comment in the header says that
* @param fmt ...
- 331
0
votes
0
answers
45
views
Why is my Clang not checking the format string?
#include <stdio.h>
//extern int printf(const char* __restrict, ...) __attribute__ ((format (printf, 1, 2)));
void test_func(void);
void test_func(void) {
int test_object = 0;
printf(&...
- 5,563
4
votes
3
answers
184
views
Trying to exploit the stack content with a format string, but I can't understand where it takes the output from
I am studying for my Computer Security exam and I am on the Format String Bugs section. In the notes there is this code, and I was testing it on my VM:
#include <stdio.h>
void test(char *arg) {
...
- 51
0
votes
0
answers
66
views
issues with "atof" function in MPLAB X IDE v6.25 with XC8 v03.00
I'm working on some code for a PIC microcontroller PIC18F47J53. I'm using MPLAB X IDE v6.25 and the package PIC18F-J_DFP 1.9.170. Both are latest versions.
A year ago, I used exactly the same code, ...
- 235
4
votes
2
answers
126
views
awk printf long number padding output incorrect
Arch linux 6.15.7-zen1-1-zen,
$ awk -V
GNU Awk 5.3.2, API 4.0, PMA Avon 8-g1, (GNU MPFR 4.2.2, GNU MP 6.3.0)
Start with y.csv:
4 2016201820192020
5 20162018201920202023
5 20162018201920202024
5 ...
- 587
3
votes
2
answers
81
views
What's the OCaml equivalent of C's printf("%.3s"), i.e, specifying a maximum width for a string argument?
In C, one can write:
printf("%.3s", "foobar");
To get foo printed as a result (that is, print the initial part of a string).
In OCaml, Printf.printf "%.3s" "foobar&...
- 9,364
1
vote
1
answer
121
views
Problems with printing double constants in c
I have codes that look like this
#include <float.h>
#include <stdio.h>
int main(void)
{
long double x = LDBL_MAX;
printf("%Lf ", x);
printf("%Lf\n", 1....
- 23
0
votes
2
answers
131
views
printf special character in interactive shell, but not from shell script
I'm trying to print a special character from a Shell script. printf '\U002F' works in interactive shell, but not from Bash shell script. Shell script keeps printing \u002F. I tried to escape \, but it ...
- 105
4
votes
2
answers
203
views
Can I printf a half-precision floating-point value?
I have a _Float16 half-precision variable named x in my C program, and would like to printf() it. Now, I can write: printf("%f", (double) x);, and this will work; but - can I printf x ...
- 137k