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Quest: page 13

Modify the temperature conversion program to print a heading above the table.
Write a program to print the correspongind celsius to farh table (i did kelvin instead)

To accomplish this we need to understand the printf formatting:

%c character
%d decimal (integer) number (base 10)
%e exponential floating-point number
%f floating-point number
%i integer (base 10)
%o octal number (base 8)
%s a string of characters
%u unsigned decimal (integer) number
%x number in hexadecimal (base 16)

examples:

#include <stdio.h>
#include <stdlib.h>

int main() {
  // print min width of 3 right justified
  printf("%3d\n", 0);
  printf("%3d\n", 10);
  printf("%3d\n", 100);
  printf("\n");

  // left justified
  printf("%-3d\n", 0);
  printf("%-3d\n", 10);
  printf("%-3d\n", 100);
  printf("\n");

  // printf zero fill options
  printf("%03d\n", 0);
  printf("%03d\n", 10);
  printf("%03d\n", 100);
  printf("\n");

  // At least five-wide, with a plus sign
  printf("%+5d\n", 10);
  // Five-wide, plus sign, left-justified
  printf("'%-+5d'", 10);
  printf("\n");

  // quick float example
  // Eight-wide, two after the decimal
  printf("'%8.2f'", 10.3456);
  printf("\n");
  // string
  printf("%s\n", "Hello");
  // 10 char string
  printf("%10s\n", "Hello");
  // 10 char left justified
  printf("%-10s\n", "Hello");
  printf("\n");
}

solution

To print the table. I will reserve the needed space to make the table left aligned.

note

stdlib is included by default. I included to have a ref for my code editor. EXIT_SUCCESS is defined in stdlib.h

definition example
/* We define these the same for all machines.
   Changes from this to the outside world should be done in `_exit'.  */
#define EXIT_FAILURE    1   /* Failing exit status.  */
#define EXIT_SUCCESS    0   /* Successful exit status.  */

print aligned table
#include <stdio.h>
#include <stdlib.h>

#define LOWER 0
#define UPPER 300
#define STEP 20

// fahr to celsius
double ftoc(int f) { return (5.0 / 9.0) * (f - 32); }

// kelvin to celsius
double ktoc(int k) { return k - 273.15; }

int main() {
  int fahr;
  printf("%-10s %-10s\n", "fahrenheit", "celsius");

  for (fahr = UPPER; LOWER <= fahr; fahr -= STEP) {
    printf("%-10d %-10.2f\n", fahr, ftoc(fahr));
  }

  for (int i = 0; i < 50; i++) {
    printf("=");
  }

  printf("\n");
  // kelvin heading
  printf("%-10s %-10s\n", "kelvin", "celsius");
  int kelvin;
  for (kelvin = LOWER; kelvin <= UPPER; kelvin += STEP) {
    printf("%-10d %-10.2f\n", kelvin, ktoc(kelvin));
  }

  return EXIT_SUCCESS;
}

printed table
fahrenheit celsius   
      148.89    
      137.78    
      126.67    
      115.56    
      104.44    
      93.33     
      82.22     
      71.11     
      60.00     
      48.89     
      37.78     
       26.67     
       15.56     
       4.44      
       -6.67     
        -17.78    
==================================================
kelvin     celsius   
        -273.15   
       -253.15   
       -233.15   
       -213.15   
       -193.15   
      -173.15   
      -153.15   
      -133.15   
      -113.15   
      -93.15    
      -73.15    
      -53.15    
      -33.15    
      -13.15    
      6.85      
      26.85     

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Quest: page 13​

solution​

Quest: page 13

solution