Visual Studio '13 (Access Violation) -

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when compile , run program via gcc(g++)/cygwin compiles , acts expected.

#include <iostream> using namespace std;  int main(int argc, char* argv[]) { (int arg = 1; arg <= argc; arg++)     {         cout << argv[arg] << endl;     } return 0; }

however, when compiling visual studio 13, program compiles given access violation upon execution. gives?

unhandled exception @ 0x000b5781 in demo.exe: 0xc0000005: access violation reading location 0x00000000.

argv pointer first element of array containing argc+1 elements. first argc elements of array contain pointers first elements of null terminated strings representing arguments given program environment (commonly first of these strings name of program, followed command line arguments).

the last element of array (the argc+1th element, argv[argc] refers to) null pointer. code dereferences null pointer, leading undefined behaviour.

the important thing note here array indexing in c++ zero based, rather one based. means first element of array arr of length n arr[0], , last element arr[n-1]. code appears assume first element of such array arr[1] , last element arr[n].


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