The C Programming Language 2^nd Edition Solutions¶

This page contains my solutions and notes for exercises from The C Programming Language, 2^nd Edition by Brian W. Kernighan and Dennis M. Ritchie.

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Chapter 1 - A Tutorial Introduction¶

1.1 Getting Started¶

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.

SOLUTION
#include <stdio.h>

int main() {
    printf("hello world\n");
}

OUTPUT

hello world

Exercise 1-2¶

Experiment to find out what happens when printf's argument string contains \c, where c is some character not listed above.

NOTE: The following are example escape sequences that are not in the standard C, their behavior is undefined and may varry between compilers. In my case, it compiled with warnings and output the characters without the backslashes, while for another person it errored on their machine.

SOLUTION
#include <stdio.h>

int main() {
    printf("test : \c,\q,\y,\z,\w,\!,\@,\# : test");
}

OUTPUT

test : c,q,y,z,w,!,@,# : test

1.2 Variables and Arithmetic Expressions¶

Original temperature conversion program

#include <stdio.h>
/* print Fahrenheit-Celsius table
for fahr = 0, 20, ..., 300; floating-point version */
int main() {
    float fahr, celsius;
    float lower, upper, step;
    lower = 0;   /* lower limit of temperature scale */
    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;
    }
}

Exercise 1-3¶

Modify the temperature conversion program to print a heading above the table.

SOLUTION
#include <stdio.h>
/* print Fahrenheit-Celsius table for fahr = 0, 20, ..., 300; floating-point version */
int main() {
    float fahr, celsius;
    float lower, upper, step;
    lower = 0;   /* lower limit of temperature scale */
    upper = 300; /* upper limit */
    step = 20;   /* step size */
    fahr = lower;
    printf("%3s %6s\n", "F", "C");
    while(fahr <= upper) {
        celsius = (5.0 / 9.0) * (fahr - 32.0);
        printf("%3.0f %6.1f\n", fahr, celsius);
        fahr = fahr + step;
    }
}

OUTPUT

Exercise 1-4¶

Write a program to print the corresponding Celsius to Fahrenheit table.

NOTE: I used the formula F = (C * (9 / 5)) + 32 to convert from Fahrenheit to Celsius.

SOLUTION
#include <stdio.h>
/* Prints common temperatures from Celsius to Fahrenheit */
int main() {
    float fahr, celsius;
    float lower, upper, step;
    lower = 0;   /* lower limit of temperature scale */
    upper = 300; /* upper limit */
    step = 20;   /* step size */
    celsius = lower;
    printf("%3s %6s\n", "C", "F");
    while(celsius <= upper) {
        fahr = (celsius * (9.0 / 5.0)) + 32;
        printf("%3.0f %6.1f\n", celsius, fahr);
        celsius = celsius + step;
    }
}

OUTPUT

The C Programming Language 2nd Edition Solutions¶

Chapter 1 - A Tutorial Introduction¶

1.1 Getting Started¶

Exercise 1-1¶

Exercise 1-2¶

1.2 Variables and Arithmetic Expressions¶

Exercise 1-3¶

Exercise 1-4¶

The C Programming Language 2^nd Edition Solutions¶