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Hi Man

I try to figure out the difference between the "for" and "while", the following code works fine with for loop but it does not work with while loop, what is the problem?

#include <stdio.h>
#define MAXLINE 1000
int getlines(char linestr[], int limitation);
void copy(char to[], char from[]);
main()
{
int len; /* current line length /
int max; / maximum length seen so far /
char line[MAXLINE]; / current input line /
char longest[MAXLINE]; / longest line saved here */

max = 0;
while( (len = getlines(line, MAXLINE)) > 0)
{
if(len > max)
{
    max = len;
    copy(longest, line);
}
}
if (max> 0) /* there was a line */
{
printf("\n%s", longest);
}
return 0;

}
int getlines(char linestr[], int limitation)
{
int i, c;

i = 0;
while((c=getchar()) != EOF && i < limitation - 1)
{
if(c == '\n')
{
    linestr[i] = c;
    ++i;
    linestr[i] = '\0';
    return i;
}
else
{
    linestr[i] = c;
    i++;
}
}

}

/*
int getlines(char linestr[], int limitation)
{
int i;
int c;

for(i=0; i < limitation - 1 && (c=getchar()) != EOF && c !='\n'; ++i)
{
linestr[i] = c;
}
if (c == '\n')
{
linestr[i] = c;
++i;
}
linestr[i] = '\0';
return i;

}
*/

void copy(char to[], char from[])
{
int i;

for(i=0; (to[i] = from[i]) != '\0'; i++)
;

}

Best Regards,
Ming

Write a program to find the HCF and LCM of the given number without using the multiplication and division.

hello man can you help me in C ?
i now how to extract ANCII chars and concaternate them..
what i need to know its how can i execute that ancii string after concaternation ..

example:
1º i what to extract the string whoami from ancii chart
2º concaternate the chars to build whoami command
3º and execute the string concaternated ..

this code does allmost everything..
it extracts the chars, concaternate them ...
but it only prints the string ..
but i dont what to print ..i want to execute ..

#include <stdio.h>
#include <string.h>

  int main(void)
    {
      /* variable declarations */
      char a = 119;  /* ancii character w */
      char b = 104;  /* ancii character h */
      char c = 111;  /* ancii character o */
      char d = 97;   /* ancii character a */
      char e = 109;  /* ancii character m */
      char f = 105;  /* ancii character i */
 
      /* concaternate and transform decimal values to ancii chars using putchar */
      //char command = putchar('a');putchar('b');putchar('c');putchar('d');putchar('e');putchar('f');

      /* execute command using system() */
      int system(char command);
        system(command);
    }

in your queue.c

your pop function is not O(1) complexity of time.

your vpn code is too hard for me .lol

In C it is a bad idea to type cast the result of malloc explicitly.

Here is link to the the issue on stackoverflow :

http://stackoverflow.com/questions/605845/do-i-cast-the-result-of-malloc

​#​include​ ​<​stdio.h​>

​/*
​ * @author jelathro
​ * @Date 2/19/13
​ * 
​ * Provide various examples of pointers 
​ * and how pointers work.
​ ​*/
​int​ ​main​(​void​){
​    ​//​ Basic pointers and Basic addresses
​    ​int​ *basic_pointer;
​    ​int​ basic_value;

​    ​//​ Give value a literal value
​    basic_value = ​'​A​'​;
​    ​//​ Assign pointer to address
​    ​//​ of literal value in value
​    basic_pointer = &basic_value;

​    ​printf​(​"​pointer is at address ​%p​\n​"​, &basic_pointer);
​    ​printf​(​"​value at address of pointer is ​%c​\n\n​"​, *basic_pointer);

​    ​//​ More advanced use of pointers
​    ​//​ Array's are just fancy pointers
​    ​char​ array[​5​] = {​'​a​'​, ​'​A​'​, ​'​b​'​, ​'​z​'​, ​'​M​'​};
​    ​char​ *same_array = array;
​    ​char​ **fancy_same_array = &same_array;

​    ​printf​(​"​array[3] = ​%c​, addr = ​%p​\n​"​, array[​3​], &array[​3​]);
​    ​printf​(​"​same_array[3] = ​%c​, addr = ​%p​\n​"​, same_array[​3​], &same_array[​3​]);
​    ​printf​(​"​**fancy_same_array[3] = ​%c​, addr = ​%p​\n​"​, (*fancy_same_array)[​3​], &(*fancy_same_array)[​3​]);

​    ​//​ char arrays are also just a "string"
​    ​//​ of characters.
​    ​printf​(​"​array string ​%s​, addr = ​%p​\n​"​, array, &array);
​    ​printf​(​"​same array string ​%s​, addr = ​%p​\n​"​, same_array, &same_array);
​    ​printf​(​"​fancy array string ​%s​, addr = ​%p​\n\n​"​, (*fancy_same_array), &(*fancy_same_array));

​    ​//​ Arrays of pointers
​    ​char​ *ptr_array[​2​];
​    ​char​ *ptr1 = ​NULL​, *ptr2 = ​NULL​;
​    ​char​ char_elements[​2​] = {​'​H​'​, ​'​i​'​};

​    ptr1 = &char_elements[​1​];
​    ptr2 = char_elements;

​    ptr_array[​0​] = ptr2;
​    ptr_array[​1​] = ptr1;
​    
​    ​printf​(​"​**ptr_array = ​%c​\n​"​, **ptr_array);
​    ​printf​(​"​addr at **ptr_array = ​%p​\n​"​, &(**ptr_array));
​    ​printf​(​"​addr at **ptr_array[0] = ​%p​\n\n​"​, &(ptr_array[​0​]));
​    
​    ​printf​(​"​ptr_array[1] = ​%c​\n​"​, *ptr_array[​1​]);
​    ​printf​(​"​addr at *ptr_array[0] = ​%p​\n​"​, &(**ptr_array));
​    ​printf​(​"​addr at *ptr_array[0] = ​%p​\n​"​, &(**ptr_array));
​    ​printf​(​"​addr at *ptr_array[1] = ​%p​\n​"​, &(*ptr_array[​1​]));

​    ​return​ ​0​;
​}

• In the Hashtable module, most memory allocation doesn't check if the allocation was successful.
  it rather assumes a success, as such can lead to runtime errors, where a pointer to a structure will
  try to reference a structure member which doesn't exists. (this is same for all calls to 'malloc' and
  'calloc' in the the other modules like those of Queues...)

#include<stdio.h>
#include<conio.h>
int main()
{
printf(" enter your name");
return 0;
}

int address=0124;
printf("%d",address);
Output=124
Why it ain't output 0 with all of those number?

https://replit.com/@SanjanaYadav7/Sumc?s=app