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

Chapter 5 ■ Programs with Repetition Logic
Program P5.14
#include <stdio.h>
int main() {
int factor;
printf("Type of table? ");
scanf("%d", &factor);
for (int m = 1; m <= 12; m++)
printf("%2d x %d = %2d\n", m, factor, m * factor);
}
Since we do not know beforehand what type of table would be requested, we cannot use 7,
say, in the format string, since the user may want a “9 times” table. We must print the variable
factor which holds the type of table.
The following is a sample run:
Type of table? 7
1 x 7 = 7
2 x 7 = 14
3 x 7 = 21
4 x 7 = 28
5 x 7 = 35
6 x 7 = 42
7 x 7 = 49
8 x 7 = 56
9 x 7 = 63
10 x 7 = 70
11 x 7 = 77
12 x 7 = 84
We now have a program that can produce any multiplication table from 1 to 12. But there is
nothing sacred about the range 1 to 12 (special, maybe, since that’s what we all learned in school).
How can we generalize the program to produce any table in any range? We must let the user tell
the program what type of table and what range he wants. And in the program, we will need to
replace the numbers 1 and 12 by variables, (start and finish, say).
All these changes are reflected in Program P5.15.
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