Maybe try coding the polish notation first

string choice = "y"; while (choice.compare("y") == 0) { something something} cout << "\nPlay again (y/n): "; getline(cin, choice); can someone explain to me how exactly is string.compare is being used here? to break out of the loop, it has to be false which means not equal to 0, but how does cin y make the loop be 0 (and continues looping again) ?

How to make a calculator which can perform operations more than 2 numbers? Eg: 2+7*7-8 If anybody have example project Please share

choice length is one char, why not choice[0] == 'y' tho

"Input 5 digit number and print the number in the following format eg: 23289 output : 2EVEN 3ODD 2EVEN 8EVEN 9ODD" Guys any one can help me I'm beginner

string choice = "y"; while (choice.compare("y") == 0) { something something} cout << "\nPlay again (y/n): "; getline(cin, choice); can someone explain to me how exactly is string.compare is being used here? to break out of the loop, it has to be false which means not equal to 0, but how does cin y make the loop be 0 (and continues looping again) ?

string.compare() returns the boolean value. And 0 is representation of boolean value which means false, and 1 or other number (except 0) for true.

string.compare() returns the boolean value. And 0 is representation of boolean value which means false, and 1 or other number (except 0) for true.

can i know why "y" will return value of 0 at first and how does it not be 0 (to break the loop)

Based Unix return code

Only for unix based?

choice.compare("y") is true. 0 is false. Then is true equal to false? No. The result will be false. So it's stop the looping.

No, Unix error code return 0 if succees

I don't think calling pthread_join() right after pthread_create() is right. He still needs two loops, but not nested. The thread created by pthread_create() in this case is useless, he is only running a single thread at a time. The main thread will be blocking at pthread_join() right after the thread creation, waiting for the sub-thread get terminated. There is no parallelism gain. He totally misses the point of using pthread. You may want something like this: for (i = 0; i < n; i++) pthread_create(&p[i], ...); for (i = 0; i < n; i++) pthread_join(p[i], ...);

I tried, I couldn’t. Could you please explain in more detail ?

Write a value-returning function that accepts a phrase in Morse code and returns the English-language equivalent. However, if the parameter is invalid, the function should return a message telling that the parameter/input is invalid. Use one blank between each Morse-coded letter and three blanks between each Morse-coded word. Embed it in a program

Write a value-returning function that accepts a phrase in Morse code and returns the English-language equivalent. However, if the parameter is invalid, the function should return a message telling that the parameter/input is invalid. Use one blank between each Morse-coded letter and three blanks between each Morse-coded word. Embed it in a program

hey guys, I need help with understanding the game's instruction The game should be played as follows: 1. Player one and two enter their name 2. System shuffle and randomly assigned numbers 1-10 to the cards 3. Player one pick a card 4. System shuffle remaining cards and randomly assigned numbers 1-9 to the cards 5. Player two pick a card 6. Both Player show cards – players with higher type and system precedence wins the round a mark of 10 is given to the winner Player 1 and Player 2 are given free will and are able to pick their own cards right??? Not the program automatically pick a card for them

What?

When there are some test tasks sometimes they are accompanied with examples of input and output

#include <stdio.h> #include <stdlib.h> void getArray(int n); void displayArray(int n); int main(void) { int n; printf("enter the limit:"); scanf("%d",&n); getArray(n); displayArray(n); return EXIT_SUCCESS; } void getArray(int n) { int i,j,a[20][20]; printf("enter the array elements:\n"); for(i=0;i<n;i++) { for(j=0;j<n;j++) { scanf("%d",&a[i][j]); } } } void displayArray(int n) { int i,j,a[20][20]; printf("Array values are:\n"); for(i=0;i<n;i++) { for(j=0;j<n;j++) { printf("%d \t",a[i][j]); } printf("\n"); } }

The scanf() in getArray() fills the local variable array a[20][20], then it returns. It doesn't do anything else. In displayArray() function, you are basically printing uninitialized variable. The array in this function hasn't been initialized. You need to know that each function has its own local variable, the local variable in displayArray() is a different thing with the local variable in the getArray(). What you should do is put the local variable in the caller, then pass it to getArray() and displayArray() as an argument. Or, you can use a global variable, but it's not necessary for your case, prefer to use local variable.

Thanks for the detailed reply. The program is working as i intended, i.e. with getarray() i'm able to input an nxn array and with displayarray() i am able to print nxn array which i inputted through getarray(), but i don't understand how it works

so i understand array[20][20] is static

https://dpaste.org/P1JMp#L10,12,1 Hey I was wondering if anyone knew a way where i can assign num1,num2,num3,num4,num5 and so on to the same random number generator, so i dont have to type the same code so many times

Maybe array?

Can't use array ... Teacher said only use what was taught 😔

It's not, you're basically just invoking undefined behavior. Your displayArray() function reads uninitialized local variable. This variable lives on the stack. The storage of this array may get reused, when it hasn't been clobbered, you may see the same value. But it's not always the case.

I think I have explained it detail enough. Can you be more specific in which part you want more detail?

why setprecision is not giving the expected result? int main() { int i; long l; char c; float f; double d; scanf("%d %ld %c %f %lf", &i, &l, &c, &f, &d); cout << i << endl; cout << l << endl; cout << c << endl; cout << setprecision(3) << f << endl; cout << setprecision(9) << d << endl; } input: 3 12345678912345 a 334.23 14049.30493 output: 3 12345678912345 a 334 14049.3049

code wher

why setprecision is not giving the expected result? int main() { int i; long l; char c; float f; double d; scanf("%d %ld %c %f %lf", &i, &l, &c, &f, &d); cout << i << endl; cout << l << endl; cout << c << endl; cout << setprecision(3) << f << endl; cout << setprecision(9) << d << endl; } input: 3 12345678912345 a 334.23 14049.30493 output: 3 12345678912345 a 334 14049.3049

i was expecting this output for the last two numbers: 334.230 14049.304930000

I did it this way: #include <stdio.h> #include<stdlib.h> #include <pthread.h> #include<unistd.h> void *task2 (void *var); int main() { int count; printf("Enter number:"); scanf("%d",&count); pthread_t threadIDs[count]; for(int i=1;i<=count;i++){ pthread_create(&threadIDs[i],NULL,task2,NULL); for(int j=1;j<=i;j++){ pthread_join(threadIDs[i],NULL); printf("*"); } printf("\n"); } return 0; } void *task2 (void *var) { sleep(1); pthread_exit(0); }

This doesn't make sense. The threads you create don't do anything other than sleep(1). I don't understand the need of using pthread here.

so how else can i do it?

What is exactly your goal?

Hi guys, I have this data struct: typedef struct _data{ int id; char *string; } data at a certain point, my code features the following lines: data *my_data= malloc(sizeof(data) + strlen(argv[1] ) + 1); strcpy(my_data->string, argv[1]); Where argv[1] it's a string given from the user when starting the code The code will always give me a "core dumped" on this point, the strcpy function, and I really don't get why. I tried by creating a char *random_string; and putting random_string in strcpy instead of my__data->string and it works. Can you please help me? This is driving me insane!

yep, I did that malloc on line 7 of my previous message

int main(int argc, char **argv){ if(argc <= 1){ printf("Non ci sono abbastanza argomenti.\n"); return -1; } int n_threads= argc-1; pthread_t tid; for(int i= 1; i < n_threads; i++){ thread_data *my_data; if((my_data= malloc(sizeof(thread_data) + strlen(argv[i]) + 1)) == NULL){ printf("C'è stata una failure da parte di malloc.\n"); return -1; } printf("total lenght of data struct: %lu & only string lenght: %lu", sizeof(my_data), sizeof(my_data->string)); fflush(stdout); my_data->id= i; strcpy(my_data->string, argv[i]); puts("I did the strcpy"); // NOTE: this is NEVER printed because of sef fault on previous line! if(pthread_create(&tid, NULL, thread_function, (void *) my_data) == -1){ printf("C'è stato un problema nella creazione del thread %d-esimo.\n", i); fflush(stdout); return -1; } } printf("Fatto tutto!\n");

You only allocate the struct memory, but not the struct member string memory

char name[9][28]={0};

what is wrong with it? i want to assign all values inside this array as 0