שפת C/לולאות/תרגילים

#include <stdio.h>
 
int main()
{
  int i,num;
 
  printf("Please enter a number");
  scanf("%d",&num);
 
  for(i=1;i<=num;i+=2)
    printf("%d ",i);
 
  return 0;
}

#include <stdio.h>
 
int main()
{
  int i, num, kind;
 
  printf("Please enter a number");
  scanf("%d",&num);
 
  printf("what kind of numbers would you like?");
  scanf("%d",&kind);
 
  if (kind!=1 && kind!=2)
  {
    printf("You entered wrong input");
 
    return -1;
  }
 
  for(i=kind;i<=num;i+=2)
    printf("%d ",i);
 
  return 0;
}

#include <stdio.h>
 
 
int main()
{
  float angle;
  unsigned int i;  
  float sinus = 0;
 
  int sign = 1;
  unsigned long int factorial = 1;
  float power;
 
  printf("Please enter angle: ");
  scanf("%f", &angle);
 
  power = angle;
 
  for(i = 0; i < 10; ++i)
  {
    sinus += sign * power / factorial;
 
    sign = -sign;
    factorial *= (2 * i + 2) * (2 * i + 3);
    power *= angle * angle;
  }
 
  printf("sin(%f) ~= %f\n", angle, sinus);
}

#include <stdio.h>
int main()
{
  int guess = 500, diff = 250;
 
  printf ("Think of a number in the range 1-1000...\n");
  printf ("The program will attempt to guess the number.\n");
  printf ("Please click 1 if the number is smaller than the program's guess, ");
  printf ("2 if the guess was correct, ");
  printf("or 3 if the number is greater.\n\n");
 
  do
  {
    char response;
 
    printf ("Is the number %d? ", guess);
    scanf ("%d", &response);
 
    switch (response)
    {
    case 1:
      guess -= diff;
      break;
    case 3:
      guess += diff;
      break;
    case 2:
      printf ("The program guessed your number!\n");
      break;
    default:
      printf ("Error in input!\n");
      return -1;
    }
 
    diff /= 2;
    if(diff == 0)
      diff = 1;
  }
  while (response != 2)
 
  return 0;
}