Learn to Program with C_ Learn to Program using the Popular C Programming Language ( PDFDrive )

Chapter 5 ■ Programs with Repetition Logic
Each time the loop is executed, c is incremented by 10. Using this, we write Program P5.16 to
produce the table.
Program P5.16
#include <stdio.h>
int main() {
double c, f;
printf("Celsius Fahrenheit\n\n");
for (c = 0; c <= 100; c += 10) {
f = 32 + 9 * c / 5;
printf("%5.0f %9.0f\n", c, f);
}
}
An interesting part of the program are the printf statements. In order to get the temperatures
centered under the heading, we need to do some counting. Consider the heading
Celsius Fahrenheit
with the C in column 1 and 2 spaces between s and F.
Assume we want the Celsius temperatures lined up under i and the Fahrenheit temperatures
lined up under n (see output above).
By counting, we find that i is in column 5 and n is in column 15.
From this, we can figure out that the value of c must be printed in a field width of 5 (the first
5 columns) and the value of f must be printed in the next 10 columns. We use a field width of 9 for
f since there is already one space between f and % in printf(...).
We print c and f without a decimal point using 0 as the number of decimal places in the
format specification. If any temperature is not a whole number, the 0 specification will print it
rounded to the nearest whole number, as in the table below.
Celsius Fahrenheit
20 68
22 72
24 75
26 79
28 82
30 86
32 90
34 93
36 97
38 100
40 104
130
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