In your code, characters is of type char which is not fit to store a string. You need to make characters as an array. Essentially, what happens behind the hood is, because of %s, the input value (even if a single char) gets stored in the memory pointed by the address supplied, but after that, … Read more
These are the very basics of C Programming, and I strongly advise you to get a decent book – The C Programming Language by Dennis Ritchie would be a good start. There are numerous errors in your code. A char can contain only one character, like ‘A’, or ‘a’ or something like that. When you’re … Read more
First of all, they all have undefined behavior for the same reason: They will read a number of characters you can’t know in advance, but through your pointer, you provide storage where to store this data, and this storage has some fixed size. Therefore, there are always inputs possible that will overflow your buffer. You … Read more
You need to set isPrime to 0 each time the user enters a number. Otherwise, it still holds the value from the previous number. Move the variable declaration int isPrime = 0; inside the while loop. BTW, isn’t that variable name backwards? You set it to 1 (i.e. true) when you discover that there’s a … Read more
In This case space after %d is format specifier so it’s take 2 argument with space as separator. scanf(“%d %d”, &marks[i], &marks[i+1]); => 1 2 scanf(“%d “, &marks[i]); => 1 2 scanf(“%d”, &marks[i]); => 1 solved Why is scanf being performed 11 times?
Three problems here. First scanf(ifp,”%lf %lf\n”,&theta,&Cla); You’re calling scanf when you look like you want to use fscanf: fscanf(ifp,”%lf %lf\n”,&theta,&Cla); Second is the file you’re opening: ifp=fopen(argv[0],”r”); argv[0] is the name of the running executable, which is probably not what you want. If you want the first argument passed in, use argv[1] ifp=fopen(argv[1],”r”); Last is … Read more
This scanf(“%s”,kar[1000]); should trigger a compiler warning, as you pass a char where a char* is expected. You pass the 1001st element of kar (which is out of kar‘s bounds, BTW). In C array indices start with 0 for the 1st element. To scan into kar, just pass the address of kar‘s 1st element. scanf(“%s”, … Read more
The answer variable is defined as character so you should change the format string of the scanf function: scanf(“%c”,&answer); 9 solved C – for loop only execute ones after scanf [closed]
You need to allocate an array of vectors, using malloc. typedef struct { float x; float y; }vectors; vectors initializeVector(vectors userVect[], int length); int main() { /* This block determines the amount of vectors that will be added. It will then create an array of vector structs the size of the amount being added. Afterwards … Read more
Using feof() is a bad idea as it can return zero, and then the next line of input can encounter end of the file – which can give unexpected errors Also fgets() returns NULL if an error occurs, including encountering end of file. Imagine your loop has been going along happily, and has just read … Read more
There are multiple issues in the code fragment: The ch = scanf(“%c”, &ch); serves no purpose and does not even properly read a byte from the file into ch. Note that scanf does store the byte into ch, but it is immediately overwritten as you store the return value into ch as well. Just remove … Read more
Whats wrong with this program in C? It terminates. I am having difficulty in understanding read input string in pointer of pointers [closed] solved Whats wrong with this program in C? It terminates. I am having difficulty in understanding read input string in pointer of pointers [closed]
No that’s not really a good way. If you just want the numbers a numbers, i.e. as normal int values, then use the “%d” conversion operator instead, and have your variables be normal int variables, which you then pass to sscanf using the address-of operator &. As in int num1; int num2; int num3; int … Read more
I think what you are missing is, your one line with nested function calls is basically same as this code: int scanf_result = scanf(“%d%d,”,&i,&a); int printf_result = printf(“PRINT %d\t”, scanf_result)); printf(“%d”, printf_result); scanf call should return 2 if you entered valid input, but can also return -1 for actual error, or 0 or 1 if … Read more
Why sscanf is not handling or ignoring spaces in c++? How else should sscanf seperate words/tokens? From its documentation: [“%s”] matches a sequence of non-whitespace characters (a string) I don’t think you can handle this with sscanf or in a one-liner at all. You could do this with std::string::find_first_of and std::string::substr Edit: std::regex_match might be … Read more