Segmentation Fault printf C

Question

The following code is giving me a Segmentation fault

void parseInput(char usrIn[])
{
char retCmd[MAX_INPUT];
retCmd[0] = usrIn[0];
printf('Debug: %c\n', retCmd[0]);
}

This is my first big project in C, but I think it's the printf giving me fault .. however I'm not sure...

What's the value of MAX_INPUT, what are you passing to the function when calling it? It's hard to help you if your question is so vague. — insumity
– insumity, Commented Oct 6, 2013 at 0:22
You need to use a string literal, not a character constant, not sure how it even compiles. — Shafik Yaghmour
– Shafik Yaghmour, Commented Oct 6, 2013 at 0:23

abelenky · Accepted Answer · 2013-10-06 00:23:47Z

5

Your original line:

printf('Debug: %c\n', retCmd[0]);

How it should be:

printf("Debug: %c\n", retCmd[0]);

Notice the change from single-quotes to double-quotes

answered Oct 6, 2013 at 0:23

abelenky

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1 Comment

Peter Chappy Over a year ago

Thanks I will make this correct answer when the time runs out ... I would have never noticed that ... even though I should of..

axon · Accepted Answer · 2013-10-06 00:28:52Z

-1

You need to make sure that the array is not zero-length. If it is, then the first element is empty and you will get a segfault when you try to access a non-existent element in the array. You can get the array length using sizeof(array) / sizeof(array[0]), or by using int main(int argc, char** argv), and checking argc for the number of elements in the argv array.

answered Oct 6, 2013 at 0:28

axon

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