C Programming

This looks suspiciously like homework to me, so I'll give you a few pointers:

The formula for the circumference of a circle is 2{pi}r, and the area is {pi}r2.

As you'll be using floating point and mathematical functions, you'll need to link with the math library (eg cc -lm -o circles circles.c)

I don't think there's a built in pi (having done very little programming in c with trignometric functions I can't be sure), so I use:

double pi = acos(-1.0);

as cos({pi}) = -1.

Your main loop will entail printing a suitable message, getting the input, checking an exit condition, converting the input to a double and then passing that to a function to calculate and print the circumference and areas. The function itself could do extra checking, eg for zero or negative radius and return an error code.

Don't forget to include the necessary header files.

You can use the ternary operator, in an expression such as:

result = a > b ? a : b;

This is equivalent to:

if (a > b)

result = a;

else

result = b;

/* Obvious method: */

#include <stdio.h>

int main(int argc, char *argv[]){

int n, tally = 0;

for(n = 1; n <= 10; n++){

tally += n;

}

printf("the total is %i.\n", tally);

return 0;

}

/* Better method: */

#include <stdio.h>

int main(int argc, char *argv[]){

int numyears = 10;

printf("the total is %i.\n", numyears * (numyears + 1) >> 1);

return 0;

}

The cross product is used to find surface normals of triangles (the building blocks of objects in 3D games). Those surface normals can then be used in dot product tests with the camera to test if the normal is facing the camera or not. If the dot product angle is positive then the normal is facing the same direction as the camera, so the triangle does not need to be drawn (because it cannot be seen). If the angle is negative, then the two vectors are pointing at each other and the triangle may need to be rendered. These methods not only apply to camera viewing, but also to lighting and physics calculations as well.

#include

double complex complex_value;

if (cimag (complex_value)==0.0)) puts ("Real");

11000101 = 197

/*

I'm using four spaces instead of tab because I'm writing this on an iPhone.

*/

#include

#include

int main() {

int num1, num2, num3, num4, sum;

printf("Please enter first number: ");

scanf("%d", num1);

printf("Please enter second number: ");

scanf("%d", num2);

printf("Please enter third number: ");

scanf("%d", num3);

printf("Please enter fourth number: ");

scanf("%d", num4);

sum = pow(num1, 2) + pow(num2, 2) + pow(num3, 2) + pow(num4, 2);

printf("The answer is %d", sum);

return 0;

}

void PrintDist (double d)

{

printf ("the distance is %g", d);

}

10

0.599853515625

It is because array name implies its address and if you want to access first element of it pointer address logic is as below:

Arrays first element address = array base address + 0

Arrays second element address = array base address + 1

Hint, read your text book. It is not that hard to do.

k = f(n) = 7n

You don't have to reduce the steps.

I'll help you with some pseudo-code (NOT ACTUAL CODE, DO NOT TRY TO COMPILE):

int absvalue(int x)

if x is below 0

return x * -1

else

return x

Also, I suggest you do your homework yourself.

if(x 9)

{

}

You cannot create a variable named "while", since that is a reserved word.

2*M+3

hexadecimal can express 16 bit binary in 4 place form, not 16.

4c

You can number the lines in a file using a simple Python program. Here's an example:

with open('input.txt', 'r') as infile, open('output.txt', 'w') as outfile:
    for line_number, line in enumerate(infile, start=1):
        outfile.write(f"{line_number}: {line}")

This code reads from input.txt, numbers each line, and writes the numbered lines to output.txt. The enumerate function is used to keep track of the line numbers, starting from 1.

The simplest method is to reverse the digits of the original number and check to see if the reversed number is equal to the original. This is not an efficient way of doing it but, for ints or long ints, it works well enough.

void main()

{

// get the number to check

long int n;

printf("ENTER A NUMBER: ");

scanf("%ld",&n);

long int n1,mod;

// make a copy of the original number in n1

n1=n;

// store the reversal in rev

long int rev=0;

while(n>0)

{

// grab the rightmost digit of n

mod = n%10;

// shift all digits of rev left, then add in the new digit

rev = rev * 10 + mod;

// shift all digits of n to the right (removing the rightmost one)

n = n / 10;

}

// after the loop, rev will have the opposite digit ordering of n1;

// if these two values are equal, then we have a palindrome

if (n1 == rev)

printf("%ld is a palindrome\n",n1);

else

printf("%ld is not a palindrome\n",n1);

}

Alternate method:

Split the number into its digits, as on the example below: Number: 3592 1st digit: 3592%10 = 2 3592/10=359. ... 2nd digit: 359%10 = 9 etc. Store these into an integer array, then check if all digits correspond to digits at the reflected position.

In programming languages, identifiers are used to name variables, functions, etc. In most languages, identifiers must start with a letter (uppercase or lowercase) or an underscore, followed by letters, digits, or underscores. Therefore, not all printable ASCII characters can be used in an identifier. Symbols such as @, #, $, and % are typically not allowed in identifiers.