Do array subscripts always start with zero?

In C language array will always starts with index 0, while there are some other languages which offers 1 as the lower index and also some languages have user defined lower and upper bounds, refer to wiki for more details : https://en.wikipedia.org/wiki/Comparison_of_programming_languages_(array) The technical reason is that C is supposed to be an efficient language. Arrays are stored in contiguous memory locations. So let say, starts at address 1000, the first element of the array will be at 1000. So, if we have indices starting at 1, the compiler would have to subtract one before it can find the actual memory address of the element , Address of an element : baseaddress + ((index-1) * sizeof(element)). In the case of 0-based indices, there is no need to subtract anything, because baseaddress + (index * sizeof(element)) gives us the appropriate address. read less