I am writing a custom vector struct I do not understand why I m getting a Warning one may be used uninitialized here This is my vector h file ifndef VECTOR H define VECTOR H typedef struct Vector int a int b int c Vector endif VECTOR The warning happens here on line one- gt a 12 include lt stdio h gt include lt stdlib h gt include lt math h gt include vector h int main void Vector one one- gt a 12 one- gt b 13 one- gt c -11

Warning: X may be used uninitialized in this function

one has not been assigned so points to an unpredictable location. You should either place it on the stack:

Vector one;
one.a = 12;
one.b = 13;
one.c = -11

or dynamically allocate memory for it:

Vector* one = malloc(sizeof(*one))
one->a = 12;
one->b = 13;
one->c = -11
free(one);

Note the use of free in this case. In general, you'll need exactly one call to free for each call made to malloc.

~ Answered on 2012-10-18 16:07:51