Pls find below where I have explained with data in the array after case 1 & case 2. All arrays consist of contiguous memory locations. Technically '\0' is equal to 0 (in ascii) but you should use '\0' because it makes your intention clear. but you have to do std::fill(arr, arr + sizeof arr, 0); or if you have the length somewhere std::fill(arr, arr + arr_len, 0); assuming an array of char, It is valid only in C . @Zan the OP doesn't want to use memset (perhaps he's embedded and doesn't have it available). Though setting first argument to NULL will do the trick, using memset is advisable. That is what memset is for: This is generally the fastest way to take care of this. Writing code in comment?

Can employer legally stop paying time & 1/2 to exempt employee after stating in the offer that they would do so? If you are working with null terminated strings, then in the first example, you'll get behavior that mimics what you expect, however the memory is still set. A specific element in an array is accessed by an index. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type. Here balance is a variable array which is sufficient to hold up to 10 double numbers. Any compiler that behaves differently is not following the C language. declaration, assignment, and accessing arrays −, When the above code is compiled and executed, it produces the following result −, Arrays are important to C and should need a lot more attention. Why does my array still contain garbage values even after “clearing” them in C. How to connect Arduino to C++ using sockets? I thought by setting the first element to a null would clear the entire contents of a char array. index: It is the starting index of the range of elements to clear. If you want to clear the memory without using memset, use a for loop. If you treat it as a string, code obeying the null termination character will treat it as a null string, but that is not the same as clearing the data. How to add space between variables and fraction lines, Sustainability of ZBmath unrestricted access. Why not use memset()? How can I remove a specific item from an array? We use cookies to ensure you have the best browsing experience on our website. memset is probably the most effective way to achieve this. How do I check if an array includes a value in JavaScript? However, this only sets the first "What does it sound like" vs "How does it sound like", Help identify this audio electrical connector, Query to select attributes except specific fields. If you can use C++, consider std::fill instead: Why would you think setting a single element would clear the entire array? Setting the first element leaves the rest of the memory untouched, but str functions will treat the data as empty. How do you set, clear, and toggle a single bit? This applies equally well to character arrays in C++, even though he didn't specify. To declare an array in C, a programmer specifies the type of the elements and the number of elements required by an array as follows − This is called a single-dimensional array. How much should retail investors spend on financial data subscriptions?

If you are viewing the array as a series of chars, then the only way to clear out the data is to touch every entry. Difference in initializing and zeroing an array in c/c++? @robUK, yes you are correct.

To learn more, see our tips on writing great answers. For example, to declare a 10-element array called balanceof type double, use this statement − Here balanceis a variable array which is sufficient to hold up to 10 double numbers. On the other hand, if you are choosing to view this as a C/C++ null terminated string, setting the first byte to 0 will effectively clear the string. contents of a char array. But yes, memset is usually highly optimal, and likely faster than a for loop.

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