"Answer_to_Chapter_1"版本比较

   1 /*
   2 Author: czk
   3 Email: [email protected]
   4 Date: 20-12-05 21:30
   5 Exercise 1-1. Run the "hello, world" program on your system. Experiment with leaving out parts of the program, to see what error messages you get.*/
   6 #include <stdio.h>
   7 
   8 main()
   9 {
  10     printf("hello, world\n");
  11 }

   1 /*
   2 Author: czk
   3 Email: [email protected]
   4 Date: 20-12-05 21:30
   5 Exercise 1-2. Experiment to find out what happens when prints's argument string contains \c, where c is some character not listed above.*/
   6 #include <stdio.h>
   7 
   8 main()
   9 {
  10     printf("\a");
  11 }

   1 /*
   2 Author: czk
   3 Email: [email protected]
   4 Date: 20-12-05 21:30
   5 Exercise 1-3. Modify the temperature conversion program to print a heading above the table.*/
   6 #include <stdio.h>
   7 
   8 /* print Fahrenheit-Celsius table
   9 for fahr = 0, 20, ..., 300; floating-point version */
  10 main()
  11 {
  12     float fahr, celsius;
  13     int lower, upper, step;
  14     
  15     lower = 0; /* lower limit of temperatuire scale */
  16     upper = 300; /* upper limit */
  17     step = 20; /* step size */
  18     
  19     printf("fahr celsius\n");
  20     
  21     fahr = lower;
  22     while (fahr <= upper) {
  23         celsius = (5.0/9.0) * (fahr-32.0);
  24         printf("%4.0f %7.1f\n", fahr, celsius);
  25         fahr = fahr + step;
  26     }
  27 }

   1 /*
   2 Author: czk
   3 Email: [email protected]
   4 Date: 20-12-05 21:30
   5 Exercise 1-4. Write a program to print the corresponding Celsius to Fahrenheit table.*/
   6 #include <stdio.h>
   7 
   8 /* print Celsius-Fahrenheit table
   9 for celsius = 0, 20, ..., 300; floating-point version */
  10 main()
  11 {
  12     float fahr, celsius;
  13     int lower, upper, step;
  14     
  15     lower = 0; /* lower limit of temperatuire scale */
  16     upper = 300; /* upper limit */
  17     step = 20; /* step size */
  18     
  19     celsius = lower;
  20     while (celsius <= upper) {
  21         fahr =  celsius * (9.0/5.0) + 32.0;
  22         printf("%3.0f %6.1f\n", celsius, fahr);
  23         celsius = celsius + step;
  24     }
  25 }