Thread: compile issues

I am trying to write a averaging of 10 numbers program. When I compile it, it prints nothing to the screen. I checked everything and looks to be correct! Maybe there something i am not catching. I figured it might be my computer being wacky again!?? Sometimes when I use gets, fgets or getchar, my compiler saying... "Using _____ is dangerous" and wont compile but if i save the code and restart my compiler and open it under a new file it will run. idk heres the code so far

Code:

#include <stdio.h>
#include <string.h>

int avg(void);

int main(void)
{
    int avg(void);
}


int avg(void)
{
    char avg[10];
    printf("Please enter a number. ");
    fgets(avg, sizeof(avg), stdin);
    printf(avg);
    return 0;
}

That would be the second issue. Why is my compiler doing that??

Code:

int main(void)
{
    int avg(void);
}

You are not calling avg above. Try:

Code:

int main(void)
{
    avg();
    
    return 0;
}

I also added a return statement, which you should include, unless you are compiling as c99. It never hurts to have it there. In the case of your program, you could do something like:

Code:

int main(void)
{
    return avg();
}

Could be something glitchy with Code::Blocks saving the source file. I have seen that sort of thing happen where you hit save, but for some reason the IDE does not actually update the file.

Edit: GCC will definitely warn you* about using gets though, whether you have warnings turned on or not, so that is what that is all about.

* Technically, it is the linker that complains about using gets().

I use Gedit. To compile from command line using gcc you could do

Code:

gcc -Wall -o target_filename file.c

Or if you have multiple sources, use a Makefile

Code:

SOURCES = main.c foo.c
TARGET=main
CC = gcc
CLFAGS = -g -Wall
OBJECTS = $(SOURCES:.c=.o)

all: $(TARGET)
$(TARGET): $(OBJECTS)
     $(CC) $(CFLAGS) -o $(TARGET) $(OBJECTS)

clean:
     rm -rf $(OBJECTS) $(TARGET)

Something like that would work. I dont have a make utility in windows, not from this machine so...

And to compile, all you'd have to do at command line is: "make"

Originally Posted by codecaine_21

well it it just wont let me compile when using gets or something similar but if code blocks is restarted it will.

Then don't use them. gets is particularly dangerous and should never be used.

If I put it this way:

For every i:
print Enter a number
Store the number in the ith element.
Where i is [0, 10).

Does it help?

If not, try posting the code so we can see what the problem is exactly and guide you accordingly.