Assigning strings to arrays of characters

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When initializing an array, C allows you to fill it with values. So

char s[100] = "abcd";

is basically the same as

int s[3] = { 1, 2, 3 };

but it doesn’t allow you to do the assignment since s is an array and not a free pointer. The meaning of 

s = "abcd"

is to assign the pointer value of abcd to s but you can’t change s since then nothing will be pointing to the array.
This can and does work if s is a char* – a pointer that can point to anything.

If you want to copy the string simple use strcpy.

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