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

Chapter 5 ■ Programs with Repetition Logic
Program P5.15
#include <stdio.h>
int main() {
int factor, start, finish;
printf("Type of table? ");
scanf("%d", &factor);
printf("From? ");
scanf("%d", &start);
printf("To? ");
scanf("%d", &finish);
printf("\n");
for (int m = start; m <= finish; m++)
printf("%2d x %d = %2d\n", m, factor, m * factor);
}
The following sample run shows how to produce a “6 times” table from 10 to 16.
Type of table? 6
From? 10
To? 16
10 x 6 = 60
11 x 6 = 66
12 x 6 = 72
13 x 6 = 78
14 x 6 = 84
15 x 6 = 90
16 x 6 = 96
To cater for bigger numbers, we would need to increase the field width of 2 in the printf
statement if we want the numbers to line up neatly.
Comment on Program P5.15
The program assumes that start is less than or equal to finish. What if this is not so? For
example, suppose the user enters 20 for start and 15 for finish. The for statement becomes
for (int m = 20; m <= 15; m++)
m is set to 20; since this value is immediately bigger than the final value 15, the body is not
executed at all, and the program ends with nothing printed.
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