#include <stdio.h>
int main(void)
{
 printf("Hello World!\n");
}

#include <stdio.h>
int main(void)
{
printf("Some say the world will end in fire,\n");
printf("Some say in ice.\n");
printf("From what I’ve tasted of desire\n");
printf("I hold with those who favor fire.\n");
printf("But if it had to perish twice,\n");
printf("I think I know enough of hate\n");
printf("To say that for destruction ice is also great\n");
printf("And would suffice.\n");
}

#include <stdio.h>
int main(void)
{
 int number;
 printf("Enter a number:");
 scanf("%d",&number);
 printf("\n");
 printf("Number you entered : %d\n",number);
 return 0;
}

#include <stdio.h>
#define PI 3.14159
int main(void)
{
 double radius;
 printf("Enter radius:");
 scanf("%lf",&radius);
 printf("\n");
 printf("Circumference of the circle whose radius is %lf is %lf & its area is %lf\n",radius,2*PI*radius,PI*radius*radius);
 return 0;
}

#include <stdio.h>

int main()
{
    int miles,yards;
    double kilometers;
    printf("Enter miles,yards:");
    scanf("%d%d",&miles,&yards);
    kilometers = 1.609*(miles+yards/1760.0);
    printf("\n%d miles & %d yards equals %lf kilometers.\n",miles>
    return 0;
}

#include <stdio.h>
#include <math.h>
int main(void)
{ 
double a;
printf("Enter any number between 0 and 1:\n");
scanf("%d",&a);
sin_a = sin(a);
printf("Sin of %lf is %lf",a,sin_a)

#include <stdio.h>
int main(void)
{
 int outside,weather;
 printf("\nEnter if outside 1(for yes) or 0(for no):");
 scanf("%d",&outside);
 printf("Enter if its raining(1) or not(0):");
 scanf("%d",&weather);
 if(outside && weather)
   printf("\nPlease use an umbrella.\n");
 else
   printf("\nDress normally.\n");
  return 0;
}

#include <stdio.h>

int main(void)
{
    int blanks = 0, digits = 0, letters = 0, others = 0;
    int c;
    
    while ((c = getchar()) != EOF)
    {
        if (c == ' ') 
            ++blanks;
        else if (c >= '0' && c <= '9')
            ++digits;
        else if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
            ++letters;
        else
            ++others;
    }
    
    printf("blanks = %d,\n digits = %d,\n letters = %d,\n others = %d.\n\n", blanks, digits, letters, others);
    
    return 0;
}