Learn C - C Floating-Point Type

/* your weight in platinum */
#include <stdio.h>
int main(void)
{// ww w. ja v  a 2 s . c  o  m
    float weight;    /* user weight             */
    float value;     /* platinum equivalent     */
    
    printf("Please enter your weight in pounds: ");
    
    /* get input from the user                     */
    scanf("%f", &weight);
    value = 3.0 * weight;
    printf("Your weight is worth $%.2f.\n", value);
    return 0;
}

#include <stdio.h> 
main() // w w w . j  a v a  2 s.c  o m
{ 
   //variable declarations 
   float y; 

   //variable initializations 
   y = 554.21; 
   //printing variable contents to standard output 
   printf("\nThe value of float variable y is %f", y); 
} 

    #include <stdio.h> 
      //www. j  a va2 s  .c  o m
    int main(void) 
    { 
      float length = 10.0f;               
      float part_count = 4.0f;                 // Number of equal pieces 
      float part_length = 0.0f;                
      part_length = length/part_count; 
      printf("%f can be divided into %f pieces and each part is f .\n", length, part_count, part_length); 
      return 0; 
    } 

    #include <stdio.h> 
      /*from w w  w .  j  av  a2  s.  c o m*/
    int main(void) 
    { 
      float length = 10.0f;               
      float part_count = 4.0f;                 // Number of equal pieces 
      float part_length = 0.0f;                
      part_length = length/part_count; 
  
      printf("A plank %.2f feet long can be cut into %.0f pieces %.2f feet long.\n", 
                                       length, part_count, part_length); 
      return 0; 
    } 

    #include <stdio.h> 
      //ww w . j  a va 2s.  co  m
    int main(void) 
    { 
      float length = 10.0f;               
      float part_count = 4.0f;                 // Number of equal pieces 
      float part_length = 0.0f;                
      part_length = length/part_count; 
  
      printf("A %8.2f plank foot can be cut into %5.0f pieces %6.2f feet long.\n", 
                                               length, part_count, part_length); 

      const double RENT = 3852.99;  // const-style constant 
   
      printf("*%f*\n", RENT); 
      printf("*%e*\n", RENT); 
      printf("*%4.2f*\n", RENT); 
      printf("*%3.1f*\n", RENT); 
      printf("*%10.3f*\n", RENT); 
      printf("*%10.3E*\n", RENT); 
      printf("*%+4.2f*\n", RENT); 
      printf("*%010.2f*\n", RENT); 
      return 0; 
    } 

    #include <stdio.h> 
      /* w w w  .ja  v  a  2 s. c  om*/
    int main(void) 
    { 

        printf("%.1f", 3.123456); 
        printf("\n%.2f", 3.123456); 
        printf("\n%.3f", 3.123456); 
        printf("\n%.4f", 3.123456); 
        printf("\n%.5f", 3.123456); 
        printf("\n%.6f", 3.123456); 
      return 0; 
    } 

    #include <stdio.h> 
      /*from  www.ja v a2s.  c om*/
    int main(void) 
    { 
      float length = 10.0f;               
      float part_count = 4.0f;                 // Number of equal pieces 
      float part_length = 0.0f;                
      part_length = length/part_count; 
  
      printf("A %-18.2f plank foot can be cut into %5.0f pieces %6.2f feet long.\n", 
                                               length, part_count, part_length); 
      return 0; 
    } 

#include <stdio.h> 
  // ww  w. j  a  v a2 s.c om
int main(void) 
{ 
  float radius = 0.0f;                  // The radius of the table 
  float diameter = 12.12f;              // The diameter of the table 
  float circumference = 0.0f;           // The circumference of the table 
  float area = 0.0f;                    // The area of the table 
  float Pi = 3.14159265f; 
  
  radius = diameter/2.0f;               // Calculate the radius 
  circumference = 2.0f*Pi*radius;       // Calculate the circumference 
  area = Pi*radius*radius;              // Calculate the area 
  
  printf("\nThe circumference is %.2f", circumference); 
  printf("\nThe area is %.2f\n", area); 
  return 0; 
} 

/*from w  ww  .  ja v a 2 s  .co m*/
#include <stdio.h>
#include <limits.h>    // integer limits
#include <float.h>     // floating-point limits
int main(void)
{
    printf("Some number limits for this system:\n");
    printf("Biggest int: %d\n", INT_MAX);
    printf("Smallest long long: %lld\n", LLONG_MIN);
    printf("One byte = %d bits on this system.\n", CHAR_BIT);
    printf("Largest double: %e\n", DBL_MAX);
    printf("Smallest normal float: %e\n", FLT_MIN);
    printf("float precision = %d digits\n", FLT_DIG);
    printf("float epsilon = %e\n", FLT_EPSILON);
    
    return 0;
}

#include <stdio.h> 
int main(void) { 
      float aboat = 32000.0; 
      double abet = 2.14e9; 
      long double dip = 5.32e-5; 
             // w ww.  ja v a 2s.c om
      printf("%f can be written %e\n", aboat, aboat); 
      // next line requires C99 or later compliance 
      printf("And it's %a in hexadecimal, powers of 2 notation\n", aboat); 
      printf("%f can be written %e\n", abet, abet); 
      printf("%Lf can be written %Le\n", dip, dip); 
   
      return 0; 
}    

             #include <stdio.h> 
             #include <string.h>      // for strlen() prototype 
             #define DENSITY 62.4     // human density in lbs per cu ft 
             int main() 
             { /*from  w  ww .  ja v a 2 s  . c  o m*/
                 float weight, volume; 
                 int size, letters; 
                 char name[40];        // name is an array of 40 chars 
              
                 printf("Hi! What's your first name?\n"); 
                 scanf("%s", name); 
                 printf("%s, what's your weight in pounds?\n", name); 
                 scanf("%f", &weight); 
                 size = sizeof name; 
                 letters = strlen(name); 
                 volume = weight / DENSITY; 
                 printf("%s, your volume is %2.2f cubic feet.\n", name, volume); 
                 printf("first name has %d letters,\n", letters); 
                 printf("we have %d bytes to store it.\n", size); 
              
                 return 0; 
             }