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

int main() {
  printHeadline();
  function1();
  int i;

  for (i = 0; i < 1000; i++) {
    menu();
    if (menu() == 1) {
      return 0;
    } else if (menu() == 2) {
      int p1 = 1, p2 = 2;
      ReadNumbers(&p1, &p2);
    } else if (menu() == 3) {
      int p1 = 1, p2 = 2;
      add(&p1, &p2);
    } else if (menu() == 4) {
      int p1 = 1, p2 = 2;
      subtract(&p1, &p2);
    } else if (menu() == 5) {
      int p1 = 1, p2 = 2;
      divide(&p1, &p2);
    } else if (menu() == 6) {
      int p1 = 1, p2 = 2;
      multiply(&p1, &p2);
    }
  }
}

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

int add(int x1, int x2) {
  return x1 + x2;
}

int subtract(int x1, int x2) {
  return x1 - x2;
}

float divide(int x1, int x2) {
  return x1 / x2;
}

int multiply(int x1, int x2) {
  return x1 * x2;
}

void ReadNumbers(int *p1, int *p2) {
  int x1;
  int x2;
  printf("Integer 1:");
  scanf("%d", &x1);

  printf("Integer 2:");
  scanf("%d", &x2);

  *p1 = x1;
  *p2 = x2;
}

int menu() {
  int i;

  for (i = 0; i < 10; ++i) {
    printf("nnChoose from menu:n1. Exitn2. Read two numbersn3. Addn4. Subtractn5.     Dividen6. MultiplynnYour choice: ");
    scanf("%d", &menu);

    if (menu == 1 || menu == 2 || menu == 3 || menu == 4 || menu == 5 || menu == 6)
      return menu;
    else
      ++i;
    fflush(stdin);
  }
}

scanf("%d", &menu);

int p1 = 1, p2 = 2;
        float q = divide(p1, p2);

gcc -Wall -Wextra -g yoursource.c -o yourprog