====== C Examples ======
Mithat Konar \\ 
Derived from //**Differences Between C and C++**// by Robert Niemann \\
2020-05-03

===== Input/output =====

  * [[http://www.cplusplus.com/reference/cstdio/printf/ | printf() reference]]
  * [[http://www.cplusplus.com/reference/cstdio/scanf/ | scanf() reference]]


<file c example00.c>
/* Basic printf use. */
#include <stdio.h>

int main()
{
  int numSpoons = 5;

  printf( "I have %d spoons.\n", numSpoons );
  
  return 0;
}
</file>

<file c example01.c>
/* Basic scanf use. */
#include <stdio.h>

int main()
{
    int num;

    printf( "Please enter a number: " );
    scanf( "%d", &num );
    printf( "You entered %d\n", num );

    return 0;
}
</file>

<file c example02.c>
/* Common I/O format specifiers. */
#include <stdio.h>

int main()
{
  int dec = 5;
  char str[] = "abc";
  char ch = 's';
  float pi = 3.14;

  printf("%d %s %f %c\n", dec, str, pi,  ch);
  
  return 0;
}
</file>

<file c example03.c>
/* More I/O format specifiers. */
#include <stdio.h>

int main()
{
    char ch;
    int x;
    double y;

    printf("Enter a character, an integer, and a double:\n");
    scanf("%c %d %lf", &ch, &x, &y);
    printf("%c %d %lf\n", ch, x, y);
    
    return 0;
}
</file>

===== File access =====

  * [[http://www.cplusplus.com/reference/cstdio/fopen/ | fopen() reference]]

<file c example04.c>
/* Writing a text file. */
#include <stdio.h>

int main()
{
    FILE *ptr_file;
    int x;

    ptr_file = fopen("output.txt", "w");

    if (!ptr_file)
        return 1;

    for (x = 1; x <= 10; x++)
    {
        fprintf(ptr_file,"%d\n", x);
    }

    fclose(ptr_file);

    return  0;
}
</file>

<file c example05.c>
/* Reading a text file. */
#include <stdio.h>

int main()
{
    FILE *ptr_file;
    char buf[1000];    /* can store strings up to 999 chars long */

    ptr_file = fopen("input.txt","r");
    if (!ptr_file)
    {
        return 1;
    }

    while (fgets(buf,1000, ptr_file) != NULL)
    {
        printf("%s",buf);
    }

    fclose(ptr_file);
    
    return 0;
}
</file>