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A simple python confusion about format string


A simple python confusion about format string

By : Liam_S
Date : November 22 2020, 10:56 AM
This might help you The quotes depends on the string: if there are no quotes, it will use simple quotes:
code :
>>> """no quotes"""
'no quotes'
>>> """single quote:'"""
"single quote:'"
>>> """mix quotes:'" """
'mix quotes:\'" '
>>> """mix quotes:"' """
'mix quotes:"\' '
>>> '''mix quotes:"' '''
'mix quotes:"\' '
>>> print '''mix quotes:"' '''
mix quotes:"'
>>> print str('''mix quotes:"' ''')
mix quotes:"'
>>> print repr('''mix quotes:"' ''')
'mix quotes:"\' '


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Simple python format string test

Simple python format string test


By : Ray M
Date : March 29 2020, 07:55 AM
Hope that helps I don't want to give you the full answer because this is a learning exercise. I'll only give you a hint.
Starting from here:
code :
data = ("John", "Doe", 53.44)
format_string = "Hello"
print format_string % data
simple swap in python, conceptual confusion

simple swap in python, conceptual confusion


By : Marlene Struss
Date : March 29 2020, 07:55 AM
Does that help Think about how you would call swap in Python, versus how you would call a swap function in C.
For example, in C,
code :
swap(&a, &b);
swap(a, b)
a,b = swap(a,b)
a,b = b,a
Assembly code for simple coding/decoding of string confusion?

Assembly code for simple coding/decoding of string confusion?


By : Demirhan Kobat
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You need to understand the structure of memory, how the string is stored.
The teacher's code is missing any comments, so it was either your task to figure it out (and you failed), or I will not comment any further about your teacher due to diplomacy reasons.
code :
MyString:
    db string_maximum_size     ; maximum characters to store into buffer
    db character_actually_read ; characters read by INT 21h: 0Ah function
    db string_maximum_size DUP (0)  ; the string characters
LEA bx,[MyString]   ; bx = address of first byte of buffer (contains maximum size)
INC bx              ; bx now points to actual size
; instead LEA bx,[MyString+1] could have been used, skipping one INC bx
MOV cl,[bx]         ; cl = actual string size
XOR ch,ch           ; ch = 0 (extending 8 bit value in cl to unsigned 16 bit in cx)
; other option on 386+ CPU is MOVZX cx,BYTE PTR [bx]
; or XOR cx,cx  MOV cl,[bx]
INC bx              ; bx now points to the first character
Format string confusion in fscanf function in C

Format string confusion in fscanf function in C


By : ninearif
Date : March 29 2020, 07:55 AM
hope this fix your issue From the docs one might see, that:
* - assignment-suppressing character which is used not to assign the value being read to any receiveing argument of fscanf.
Why can't I read values into simple variables with simple format string using sscanf() in C?

Why can't I read values into simple variables with simple format string using sscanf() in C?


By : henrymjohnson
Date : March 29 2020, 07:55 AM
To fix this issue There is a problem with the dynamic allocation here. The line char *idNumber = (char *)malloc(sizeof (char*)); allocates space for a pointer to char, not for a char, or an array of chars. This should be something like:
code :
char *idNumber = malloc(sizeof (char) * 256);
char *idNumber = malloc(sizeof *idNumber * 256);
char *idNumber = malloc(256);
#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    char *idNumber = malloc(256);
    if (idNumber == NULL) {
        perror("Allocation failure");
        exit(EXIT_FAILURE);
    }
    char *partNumber = malloc(256);
    if (idNumber == NULL) {
        perror("Allocation failure");
        exit(EXIT_FAILURE);
    }

    int amountItems = 0;
    double unitPrice = 0;

    char *line1 = "Govan, Guthrie (N210) AX299 x 6 $149.94";
    char *line2 = "Mustaine, Dave (N106) AX350N x 2 $63.98";
    char *line3 = "Van Halen, Edward (N1402) AV2814 x 10 $34.90";

    if (sscanf(line1, "%*[^(]( %255[^)]) %255s x %d $%lf",
               idNumber, partNumber, &amountItems, &unitPrice) < 4) {
        fprintf(stderr, "Input error in line1\n");
    } else {
        printf("%s, %s, %d, %f\n",
               idNumber, partNumber, amountItems, unitPrice);
    }

    if (sscanf(line2, "%*[^(]( %255[^)]) %s x %d $%lf",
               idNumber, partNumber, &amountItems, &unitPrice) < 4) {
        fprintf(stderr, "Input error in line2\n");
    } else {
        printf("%s, %s, %d, %f\n",
               idNumber, partNumber, amountItems, unitPrice);
    }

    if (sscanf(line3, "%*[^(]( %255[^)]) %s x %d $%lf",
               idNumber, partNumber, &amountItems, &unitPrice) < 4) {
        fprintf(stderr, "Input error in line3\n");
    } else {
        printf("%s, %s, %d, %f\n",
               idNumber, partNumber, amountItems, unitPrice);
    }

    free(idNumber);
    free(partNumber);

    return 0;
}
N210, AX299, 6, 149.940000
N106, AX350N, 2, 63.980000
N1402, AV2814, 10, 34.900000
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