Is the hacking.cpp website good or bad for learning c ++?

Because I don't think I can pull off hard questions at first. So lemme get a good hang of it

int countSetBits(int n) { int res=0; while(n>0) { n=(n&(n-1)); res++; } return res; }//but i'm getting wrong output for 30

Exponential function or exp(x) = ex is a mathematical function learned in calculus. ex can be represented as a power series ex = 1 + x + x2 / 2! + x3 / 3! + … + xn / n! + … and n factorial n! = n*(n-1)*(n-2)* … *3*2*1. Write a computer program which compute and display e 10 using for loop. Please help 🙏🙏 I Need the code for this question.

int countSetBits(int n) { int res=0; while(n>0) { n=(n&(n-1)); res++; } return res; }//but i'm getting wrong output for 30

Read pinned rules

working fine in my pc.

Geeksforgeeks is showing error in it's compiler .....it is working fine on my vs code

Sharing media ia not allowed in this group

Paste the error

Wrong Answer. !!!Wrong Answer Possibly your code doesn't work correctly for multiple test-cases (TCs). The first test case where your code failed: Input: 30 Its Correct output is: 75 And Your Code's output is: 4

What is struct in C?

Please my code gives me errors after taking the input. Help me figure out what is the cause thanks https://pastebin.com/rPWWFWZy

S is an empty string and yet you try to access its character. Also, if you compare single characters it is way faster to compare them like this 'a' == S[i]. Otherwise you create a new string instance every time.

please i have a request create playlist or topic list like tutorials in c++ please so we can get at least something.

please i have a request create playlist or topic list like tutorials in c++ please so we can get at least something.

Define a function which takes ranges of numbers as defined by two parameters,start,end both inclusive. Find the count of numbers in the range that donot have 5 as one of its digits using C.. Eg: 1,8 =>7

https://docs.google.com/forms/d/e/1FAIpQLScWxoGUOG5wO0gLo_FOK6hWn-ByOXNdGMLfGTqrv4reKmOW4Q/viewform?usp=sf_link

#include <stdio.h> #include <stdlib.h> int a[3], b[3]; int i=0, j=0 ; int compareTriplets (int a[], int b[]); int compareTriplets (int a[], int b[] ) { int m, n; for(i=0;i<3; i++) { for(j=0; j<3; j++) { if (b[j] > a[i]) m++; else if(a[i] > b[j]) n++; } printf("%d %d", m, n); return 0; } } int main() { char temp1,temp2; do { scanf("%d%c", &a[i], &temp1); i++; } while(temp1 != '\n'); for(i=0; i<3; i++) { printf("%d ", a[i], temp1); } do { scanf("%d%c", &b[j], &temp2); j++; } while(temp2 != '\n'); for(j=0; j<3; j++) { printf("%d ", b[j], temp2); } return compareTriplets( a[i], b[j]); } CAN SOMEONE FIX THIS?

how to use atof function in c

#include <stdio.h> #include <stdlib.h> int compareTriplets(int a[], int b[]) { int m, n; int i = 0, j = 0; for (i = 0; i < 3; i++) { for (j = 0; j < 3; j++) { if (b[j] > a[i]) m++; else if (a[i] > b[j]) n++; } } printf("%d %d", m, n); return 0; } int main() { int a[3], b[3]; char temp1, temp2; int i = 0, j = 0; do { scanf("%d %c", &a[i], &temp1); i++; } while (i < 3); for (i = 0; i < 3; i++) { printf("%d %c \n", a[i], temp1); } do { scanf("%d %c", &b[j], &temp2); j++; } while (j < 3); for (j = 0; j < 3; j++) { printf("%d %c \n", b[j], temp2); } return compareTriplets(&a[i], &b[j]); }

Google it

it shows garbage value after printing the elements of array a and b.

could anyone explain the difference of the followin two declaration: int (* pz)[2]; int * pax[2]; I got them in C primer plus, which says the pz points to an array of 2 ints, and pax is an array of two pointers-to-int, but I can't understand why, I don't know how to google it, so I came here for help

https://stackoverflow.com/questions/13910749/difference-between-ptr10-and-ptr10

Code updated

How to learn lonked list well 🤯

Have you learned pointers? If no, start to learning about them first. If you feel comfortable with pointers I would advise to search for a video on YouTube with explanation about linked lists. There are many of them, watch a couple then try to implement it yourself.

If i want to create an array which contains different classes and i can use their methods without using stl what do i have to do?

I'm running a series of challenges of reversing, for which I'm new at. I'm using Ghidra to analyze an ELF-64 file. It gives me some wacky C as it could and I'm trying to get it as best as I can. I've been searching very hard in Google to get all solved, but there are some still unanswered questions. What do these mean? undefined8 local_48; [some code here] local_48 = 3706296898382101353; [more irrelevant code there] strncmp(argv[1], (char *)&local_48, 34); To me, being local_48 a length 8 type in that format (originally that value in HEX) maybe it's a long (I have my doubts). But I don't get what's actually going on at the second parameter of strncmp().

I guess local_48 = 3706296898382101353; is an assignment of 64-bit integer, and then the strncmp will compare the argv[1] with: - If the arch is little endian: hex2bin('336f69646c327b69') or 3oidl2{i. - If the arch is big endian: strrev(hex2bin('336f69646c327b69')) or i{2ldio3

Yep it's little endian. And isn't a 64 bit integer the same as long?

Where should be 3 different classes, but the array itself must be bigger (a class can repeat itself in the array)

Not always, I would say uint64_t / int64_t. Because long can be 32-bit, depends on environment.

I guess local_48 = 3706296898382101353; is an assignment of 64-bit integer, and then the strncmp will compare the argv[1] with: - If the arch is little endian: hex2bin('336f69646c327b69') or 3oidl2{i. - If the arch is big endian: strrev(hex2bin('336f69646c327b69')) or i{2ldio3

I'm running a series of challenges of reversing, for which I'm new at. I'm using Ghidra to analyze an ELF-64 file. It gives me some wacky C as it could and I'm trying to get it as best as I can. I've been searching very hard in Google to get all solved, but there are some still unanswered questions. What do these mean? undefined8 local_48; [some code here] local_48 = 3706296898382101353; [more irrelevant code there] strncmp(argv[1], (char *)&local_48, 34); To me, being local_48 a length 8 type in that format (originally that value in HEX) maybe it's a long (I have my doubts). But I don't get what's actually going on at the second parameter of strncmp().

So, what's actually happening at (char *)&local_48? Because simplifying it I intuit it's (char) local_48?

- &local_48 is the address of local_48. - local_48 is the value of the variable.

Yes. I know that one. Here I asserted that a pointer to the address is the value itself, in this case casting to char.

Anyway, the strncmp size bound does not seem to be safe to compare that value, it could read random data off the stack if argv[1] is longer than 8. But I am not sure, decompiler is often wrong. It is probably better to do Assembly inspection around the that strncmp call. Just to make sure.