How to convert string to float?
I expect the output should be 4.08000000 whereas I got only 4.00000000. Is there any way to get the numbers after the dot?
C
Allocating char array using malloc
Yes, it’s a matter of style, because you’d expect sizeof(char) to always be one. On the other hand, it’s very much an idiom to use sizeof(foo) when doing a malloc, and most importantly it makes the code self documenting. Also better for maintenance, perhaps. If you were switching from char to wchar, you’d switch to … Read more
Why do we use NULL in strtok()?
Why do we use NULL in strok() function? What does this program do when *h is pointing to a string?
How do I find the time complexity (Big O) of while loop?
The first code sample is pretty much a classis for loop. Its complexity is O(n^2). This is because the inner loop has a complexity O(n) and it is run n times. The second one is a bit more difficult, untill you see that is equivalent to a non nested loop (ignoring the complexity of the … Read more
printf format specifiers for uint32_t and size_t
Sounds like you’re expecting size_t to be the same as unsigned long (possibly 64 bits) when it’s actually an unsigned int (32 bits). Try using %zu in both cases. I’m not entirely certain though.
How to convert an integer to a character array using C
Make use of the log10 function to determine the number of digits and do like below: Or the other option is sprintf(yourCharArray,”%ld”, intNumber);
Error: “Access not within mapped region at address” (Valgrind)
i am having a probem with valgrind givin me an error saying “Access not within mapped region at address 0x8”. It then says “at 0x400606: append_linked_list (testing2.c:64) by 0x400563: main (testing2.c:32)”. Line 64 is list->tail->next = newNode;, and line 32 is just calling the function which line 64 is in append_linked_list(list, (void *) argv[i]);. When … Read more
How does the strtok function in C work? [duplicate]
I found this sample program which explains the strtok function: However, I don’t see how this is possible to work. How is it possible that pch = strtok (NULL, ” ,.-“); returns a new token. I mean, we are calling strtokwith NULL . This doesen’t make a lot sense to me.
C printing bits
You are calculating the result correctly, but you are not printing it right. Also you do not need a second loop: If you’d like to show off, you could replace the conditional with two exclamation points:
‘sprintf’: double precision in C
From your question it seems like you are using C99, as you have used %lf for double. To achieve the desired output replace: with The general syntax “%A.B” means to use B digits after decimal point. The meaning of the A is more complicated, but can be read about here.