Write a function roots that solves a second degree equation
ax2+bx+c=0. Write then a program
that recieves a,b, and c from command line and prints the roots of the
equation. You can assume that a, b, and c are integers.
Hint: math.h has a function double sqrt(double x); that
returns the square root of its parameter. In unix environment you have
to add an option -lm to the compilation. For instance gcc -Wall -ansi
Write a function that calculates the sum of two 10*10 matrixes.
Return the result in a pointer argument. A 10*10 matrix is a 10*10
two-dimensional array. Write a main program to test your
Write a program using pointer arrays that translates numbers in
input to a text form: 0 = zero, 1 = one, ... ,9 = nine. Don't use
switch or else-if statements. Other characters of input are printed in
the regular way.
Write a program that removes words from its input. The removed words
are given as command line arguments. Write a function
char *remove(char *line, char *word);
that removes a word from a line. Be prepared to handle several
Design appropriate structures for complex numbers. Write
functions for add and multiply operators that use complex numbers,
and for displaying a complex number. You can expect the numbers to
be of form a+bi where a and b are integers.
Write a simple command line interpreter (a shell) using pointers
to functions. You don't have to implement the commands themselves,
but adding new commands must be straightforward. It is enough that
the right function is called once a command is invoked. The called
functions are of type
int command_name(char *parameters);
where command_name is the name of the called command and parameters is
a string of its parameters. The functions return a non-zero value
when they succeed. Write also a main program where you test the shell
program. Every command in the test case only prints its name and