/* Compute the size of some fundamental types. */

#include <stdio.h>

int main(void)
{
  printf("The size of some fundamental types is computed.\n\n");
  printf(" char:%3d byte \n", sizeof(char));
  printf(" short:%3d bytes\n", sizeof(short));
  printf(" int:%3d bytes\n", sizeof(int));
  printf(" long:%3d bytes\n", sizeof(long));
  printf(" unsigned:%3d bytes\n", sizeof(unsigned));
  printf(" float:%3d bytes\n", sizeof(float));
  printf(" double:%3d bytes\n", sizeof(double));
  printf("long double:%3d bytes\n", sizeof(long double));
  return 0;
}

#include <stdio.h>

int main(void)
{
  int c;

  while ((c = getchar()) != EOF) {
    putchar(c);
    putchar(c);
  }
  return 0;
}

#include <stdio.h>

int main(void)
{
  int c;

  while ((c = getchar()) != EOF)
    if (c >= 'a' && c <= 'z')
      putchar(c + 'A' - 'a');
    else
      putchar(c);
  return 0;
}

#include <math.h>
#include <stdio.h>

int main(void)
{
  double x;

  printf("\n%s\n%s\n%s\n\n",
    "The square root of x and x raised",
    "to the x power will be computed.",
    "---");
  while (1) { /* do it forever */
    printf("Input x: ");
    scanf("%lf", &x);
    if (x >= 0.0)
      printf("\n%15s%22.15e\n%15s%22.15e\n%15s%22.15e\n\n",
        "x = ", x, "sqrt(x) = ", sqrt(x),
        "pow(x, x) = ", pow(x, x));
    else
      printf("\nSorry, your number must be nonnegative.\n\n");
  }
  return 0;
}

/* Decimal, hexadecimal, octal conversions. */

#include <stdio.h>

int main(void)
{
  printf("%d %x %o\n", 19, 19, 19); /* 19 13 23 */
  printf("%d %x %o\n", 0x1c, 0x1c, 0x1c); /* 28 1c 34 */
  printf("%d %x %o\n", 017, 017, 017); /* 15 f 17 */
  printf("%d\n", 11 + 0x11 + 011); /* 37 */
  printf("%x\n", 2097151); /* 1fffff */
  printf("%d\n", 0x1FfFFf); /* 2097151 */
  return 0;
}

#include <stdio.h>

int main(void)
{
  printf("sizeof('A') = %d\n", sizeof('A'));
  return 0;
}

#include <limits.h> /* for UINT_MAX */
#include <stdio.h>

int main(void)
{
  int i;
  unsigned u = UINT_MAX; /* typically 4294967295 */

  for (i = 0; i < 10; ++i)
    printf("%u + %d = %u\n", u, i, u + i);
  for (i = 0; i < 10; ++i)
    printf("%u * %d = %u\n", u, i, u * i);
  return 0;
}