The C Programming Language notes
The two hardest problems in programming are cache invalidation, naming things and off-by-one errors.[1]
This page contains Baltakateiʼs notes for completing the exercises in The C Programming Language, 2nd Edition by Brian Kernighan and Dennis Ritchie.
Stats
Notes
Chapter 1
Ch1 Section 1
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.
#include <stdio.h>
int main()
{
// printf("Hello, world.\n");
}
Exercise 1-2
Experiment to find out what happens when printf's string contains \c, where c is some character not listed above.
Code:
#include <stdio.h>
int main()
{
printf("hello\n");
printf("\v"); // Vertical tab
printf("world\?\n"); // Question mark
printf("foo\x0A"); // Newline (hexadecimal)
printf("ba\br\n"); // Backspace
printf("baz\b\n"); // Backspace moves cursor back but doesn't overwrite z
printf("baz\b \n"); // Backspace overwrites z with space
}
Result:
hello world? foo br baz ba
Exercise 1-3
Modify the temperature conversion program to print a heading above the table.
The temperature conversion program:
#include <stdio.h>
/* print Fahrenheit-Celsius table
for fahr = 0, 20, ..., 300; floatinq-point version */
main()
{
float fahr, celsius;
int lower, upper, step;
lower = 0; /* lower limit of temperature table */
upper = 300; /* upper limit */
step = 20; /* step size */
fahr = lower;
while (fahr <= upper) {
celsius = (5.0/9.0) * (fahr-32.0);
printf("%3.0f %6.1f\n", fahr, celsius);
fahr = fahr + step;
}
}
Code:
#include <stdio.h>
/* print Fahrenheit-Celsius table
for fahr = 0, 20, ..., 300; floatinq-point version */
int main()
{
float fahr, celsius;
int lower, upper, step;
lower = 0; /* lower limit of temperature table */
upper = 300; /* upper limit */
step = 20; /* step size */
fahr = lower;
printf("F\tC\n");
while (fahr <= upper) {
celsius = (5.0/9.0) * (fahr-32.0);
printf("%4.0f\t%4.1f\n", fahr, celsius);
fahr = fahr + step;
}
}
Output:
F C 0 -17.8 20 -6.7 40 4.4 60 15.6 80 26.7 100 37.8 120 48.9 140 60.0 160 71.1 180 82.2 200 93.3 220 104.4 240 115.6 260 126.7 280 137.8 300 148.9
Exercise 1-4
Exercise 1-5
Exercise 1-6
Verify that the expression c = getchar() != EOF (equivalent to c = ( getchar() != EOF )) sets the c variable to an integer with a value of either `0` or `1`.
Exercise 1-7
Print the EOF value specified by <stdio.h>.
Ch1 Section 2
Ch1 Section 3
Ch1 Section 4
Ch1 Section 5
Ch1 Section 6
Ch1 Section 7
Ch1 Section 8
Ch1 Section 9
Ch1 Section 10
Chapter 2
Ch2 Section 1
Ch2 Section 2
Ch2 Section 3
Ch2 Section 4
Ch2 Section 5
Ch2 Section 6
Ch2 Section 7
Ch2 Section 8
Ch2 Section 9
Ch2 Section 10
Ch2 Section 11
Ch2 Section 12
Chapter 3
Ch3 Section 1
Ch3 Section 2
Ch3 Section 3
Ch3 Section 4
Ch3 Section 5
Ch3 Section 6
Ch3 Section 7
Ch3 Section 8
Chapter 4
Ch4 Section 1
Ch4 Section 2
Ch4 Section 3
Ch4 Section 4
Ch4 Section 5
Ch4 Section 6
Ch4 Section 7
Ch4 Section 8
Ch4 Section 9
Ch4 Section 10
Ch4 Section 11
Chapter 5
Ch5 Section 1
Ch5 Section 2
Ch5 Section 3
Ch5 Section 4
Ch5 Section 5
Ch5 Section 6
Ch5 Section 7
Ch5 Section 8
Ch5 Section 9
Ch5 Section 10
Ch5 Section 11
Ch5 Section 12
Chapter 6
Ch6 Section 1
Ch6 Section 2
Ch6 Section 3
Ch6 Section 4
Ch6 Section 5
Ch6 Section 6
Ch6 Section 7
Ch6 Section 8
Ch6 Section 9
Chapter 7
Ch7 Section 1
Ch7 Section 2
Ch7 Section 3
Ch7 Section 4
Ch7 Section 5
Ch7 Section 6
Ch7 Section 7
Ch7 Section 8
Chapter 8
Ch8 Section 1
Ch8 Section 2
Ch8 Section 3
Ch8 Section 4
Ch8 Section 5
Ch8 Section 6
Ch8 Section 7
Appendix A
Appendix B
Appendix C
History
See also
External links
References
Footnotes
