if (array[0]=1) should be if (array[0]==1). The same with else if (array[0]=2). Note that the expression of the assignment returns the assigned value, in this case if (array[0]=1) will be always true, that’s why the code below the if-statement will be always executed if you don’t change the = to ==. = is the assignment … Read more
Yes char arrays are not assignable just as all arrays aren’t. You should use strcpy for example and so on. Also, you don’t need to declare char class[30]; the longest string I see in your code is “undefined” so should be ok, 9 characters of “undefined” + 1 null terminating byte ‘\0’. And you should … Read more
I’m writing a function that perform some authentications actions. I have a file with all the user_id:password:flag couples structured like this: Users.txt user_123:a1b2:0 user_124:a2b1:1 user_125:a2b2:2 This is the code: How can I manage the EOF reaching? I saw that when EOF is reached fgets doesn’t edits anymore the usr_psw_line but neither returns a NULL pointer. … Read more
CODE 1 CODE 2 CODE 1 and CODE 2 both give same output. but argument 2 of main function in CODE 1 and CODE 2 are different. Array of pointers are created above data section at compile time. argv is array of pointers. Then we should declare argument in main function as pointer to pointer … Read more
Just set the last char to be ‘\0’: In C, \0 indicates a string ending.
It’s not obvious what you’re trying to accomplish here, but I’ll assume you’re trying to do some pointer arithmetic with x, and would like x to be an integer for this arithmetic but a void pointer on return. Without getting into why this does or doesn’t make sense, you can eliminate the warning by explicitly … Read more
When reading input using scanf, the input is read after the return key is pressed but the newline generated by the return key is not consumed by scanf, which means the next time you read a char from standard input there will be a newline ready to be read. One way to avoid is to … Read more
You can return a structure from a function (or use the = operator) without any problems. It’s a well-defined part of the language. The only problem with struct b = a is that you didn’t provide a complete type. struct MyObj b = a will work just fine. You can pass structures to functions as … Read more
What about SDL? Perhaps it’s a bit too complex for your needs, but it’s certainly cross-platform.
Calculating PI value is one of the complex problem and wikipedia talks about the approximations done for it and says it’s difficult to calculate PI accurately. How does C calculate PI? Does it calculate it every time or is it using a less accurate fixed value?