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Post the full example code.
Make sure, that you use a C compiler not a C++ compiler.

You should include the declarations for both lib-functions in your code, put

#include <math.h>
at the begin of your sourcefile.

Can you read?

VLA are not supported by C++98,C++03,C++11, therefore VLA are not compatible with C++.

You should pass char-Array to your function, you should never return an lokal automatic variable to the calling context, try:


int main(void)
{
char integer[INT_SIZE+EXTRA_SPACES];
int...

You should never use VLA, VLA are bad, only C99, without error-handling and not C++ compatible.



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

#define MAXWORDNUM 90000...

The best way to read 'words' (separated by whitespaces) from a stream is fscanf, and to implement a dynamic array you can use realloc like:


int main(){
FILE *fp;
char buffer[50];
char...

#define MAXLINESIZE 50
#define MAXLINES 100
int main(){
FILE *fp;
char buffer[MAXLINESIZE];
char *words[MAXLINES]; /* define enough space for max. 100 StringPOINTERS */
int i=0;
...

You should use the %n format in sscanf like


while(i < NUM_SKATER && fgets(buffer, sizeof(buffer), fpIn))
{
sscanf(buffer,"%20[^\n]", skater[i].name);
for(k...

If you includes ctype.h you can use isdigit instead of your wrong line 32.

I know what i say.

You are wrong.
You can only specify the size of a classic array at compile time, you cannot it at runtime.
At runtime you can specify the size of an VLA (only C99).
Instead of an array you can use...

Recursion its another option:

void rev(char *o,char *s,int i)
{
char t[100];
int n;
if( i-- && 1==sscanf(s,"%s%n",t,&n) )
{
rev(o,s+n,i);
if(*o)

You should redefine the elements in your type user with as array of char array and not array of char pointers.

#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#define buffer_size 512

Its horrible code, which value has x in

int menu_function(int x)
{
while(x!=sentinel)
if you call menufunction() without(!) any argument?
Do you read your compiler warnings? I think not.

Where do you allocate memory for your structs?

for(i = month+1;i < month_1 - 1;++i); /* <<-- here is your newbie mistake */
days_total += daysinmonth(i);
days_total += days_1;
return days_total;
}

Oh my god, please read a good C book.
Try:

char line[100];
int i;
while (fgets(line, 100, in) != NULL)
{
for(i=0; line[i]!='\0'; ++i)
{
switch (line[i])

Where do you call evaluate?

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

#define STACK_SIZE 20

void push(int* stack, int* top, int element);
int pop(int* stack, int* top);

Your 'printArray' function open the file for reading ("r").

1.0 will ever interpreted as double (C standard), therefore there are specifiers l or L for long double and f or F for float.

It should be fgets(... LINES ...) or fgets(... sizeof(buffer) ...) and not fgets(... sizeof(LINES) ...).

First is right. You don't need a break here.

The compiler is right, there is a difference between posQuadracticEquation and posQuadraticEquation.

Thats wrong.
No tab is needed in formatstring, each %d in scanf will eat all heading whitespaces.

gets(s1) is unsafe when user input more than 79 chars