Thread: Calling a variable from an other function and using it in an other fuction

Hello,
I am a bit confused over the variables and the fuction declarations in C. I am coming from a 3 year python trip and it feels a bit odd but i really like it. This is my code

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
void starting_screen(void);
void selection_loader(int option);

int main()
{
  starting_screen();
  printf("~~~~~~~~~~~~~~~~~~Choose option~~~~~~~~~~~~~~~~~~~~~~");
  int option;
  scanf("%d", &option);
  starting_screen();
  selection_loader(option);
  return 0;
}

void starting_screen(void)
{
                             //starting screen
      printf("\n");
  printf("\n");
  printf("\n");
  printf("1.Mini text editor");
  printf("\n");
  printf("2.Insert text");
  printf("\n");
  printf("3.Import dictionary");
  printf("\n");
  printf("4.Edit text");
  printf("\n");
  printf("5.write and save text");
  printf("\n");
  printf("6.Calculate statistic data");
  printf("\n");
  printf("7.Escape this hell");
  printf("\n");
}

int selection_loader(option)
{
  if (option == 7) {
    exit(0);
  }

}

I want the selection_loader function to see the option variable and act accordingly the if statement. I am 100% sure that my function declaration is wrong. Thanks!

Your function declaration is fine. It is your function definition that is wrong: you left out the parameter type and changed the return type to int when you originally declared it to be void.

Code:

void selection_loader(int option)
{
  if (option == 2) {
    exit(0);
  }

  if (option == 7) {
    printf("Quit successfull");
    exit(0);
  }

}

MOD: Please stop posting code with weird fonts and colours

Originally Posted by frequencynip

May i ask,the fuction definition is above the code ,where you say that for eg is a void and the declaration is in the main program correct?

This is a function declaration, more precisely a forward declaration serving as a function prototype:

Code:

void selection_loader(int option);

This is the corresponding function definition from your original code:

Code:

int selection_loader(option)
{
  if (option == 7) {
    exit(0);
  }

}

This is a function call in the main function:

Code:

selection_loader(option);