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Annotation of 43BSD/usr.lib/learn/C/L3.1a, revision 1.1.1.1

1.1       root        1: #print
                      2: (Section 1.3)
                      3: The file Ref.c contains a copy of
                      4: a program to convert Fahrenheit to
                      5: Celsius that prints from 0 to 300
                      6: degrees in steps of 20.
                      7: Modify it to print from 300 down to 0
                      8: in steps of 50. Type ready when you're done.
                      9: #once #create Ref
                     10:  300  148.9
                     11:  250  121.1
                     12:  200   93.3
                     13:  150   65.6
                     14:  100   37.8
                     15:   50   10.0
                     16:    0  -17.8
                     17: #once #create Ref.c
                     18: /* print Fahrenheit-Celsius table 
                     19:        for f = 0, 20, ..., 300 */
                     20: main()
                     21: {
                     22:        int lower, upper, step;
                     23:        float fahr, celsius;
                     24: 
                     25:        lower = 0;      /* lower limit of temperature table */
                     26:        upper = 300;    /* upper limit */
                     27:        step = 20;      /* step size */
                     28: 
                     29:        fahr = lower;
                     30:        while (fahr <= upper) {
                     31:                celsius = (5.0/9.0) * (fahr-32.0);
                     32:                printf("%4.0f %6.1f\n", fahr, celsius);
                     33:                fahr = fahr + step;
                     34:        }
                     35: }
                     36: #user
                     37: a.out >x
                     38: #cmp Ref x
                     39: #succeed
                     40: Here's our solution:
                     41: 
                     42: main() /* Fahrenheit-Celsius 300 ... 0 by 50 */
                     43: {
                     44:        int lower, upper, step;
                     45:        float fahr;
                     46: 
                     47:        lower = 0;      /* lower limit of temperature table */
                     48:        upper = 300;    /* upper limit */
                     49:        step = 50;      /* step size */
                     50: 
                     51:        for (fahr = upper; fahr >= lower; fahr = fahr - step)
                     52:                printf("%4.0f %6.1f\n", fahr, (5.0/9.0) * (fahr-32.0));
                     53: }
                     54: #log
                     55: #next
                     56: 3.1b 10

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