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allochka39001 [22]
3 years ago
15

(5 pt.) The name of a variable in the C programming language is a string that can contain uppercase letters, lowercase letters,

digits, or underscores. Furthermore, the first character in the string must be a letter, either uppercase or lowercase, or an underscore. If the name of a variable is determined by its first 8 characters, how many different variables can be named in C
Computers and Technology
1 answer:
lilavasa [31]3 years ago
6 0

Answer:

The different variable in C is 21213316700.

Explanation:

Given value:

Total value  = letters + underscore value

Total value  = 52 + 1

Total value =53

choice for first character = 53 letters +10 digits

first character = 63

choice for remaining characters

So,

Variable number With one 1 character = 53

Variable number With 2 character  = 53 × 63

Variable number With 3 character = 53 × 63²

Variable number With 4 character  = 53 × 63³

.

.

.

Variable number With 7 character  = 53 \times  63^{7}

Total difference variable = 53 + 53 × 63+ 53 × 63²+ 53 × 63³+....+ 63^{7}

Total difference variable = 53(1 + 63 + 63²+ 63³+ .... + 63^{7})

Formula:

1+x+x^2+x^3+x^4+........x^n\\\\\Rightarrow  \frac{x^{(n+1)} -1}{x-1}

Total difference variable

53 \times \frac{63^{7+1} -1 }{63-1}\\\\53 \times \frac{63^{8} -1 }{63-1} \\\\ \therefore 63^8 = 2.48 \times 10^{14}\\\\53 \times \frac{2.48 \times 10^{14} -1  }{62}\\\\53 \times \frac{1.48 \times 10^{14}}{62}\\\\21213316700

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Explanation:

Some examples are:

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void swap(int, int);

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void swap(int c, int d)

{

 int t;

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OUTPUT

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The value of a and b remain unchanged as the values are local

//call by reference

#include <stdio.h>

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 int main()

{

 int a = 10, b = 20;

 swap(&a, &b);   //passing the address

 printf("a: %d, b: %d\n", a, b);

}

void swap(int *c, int *d)

{

 int t;

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}

OUTPUT

a: 20, b: 10

due to dereferencing by the pointer the value  can be changed which is call by reference

8 0
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3.18: Pizza Pi Joe’s Pizza Palace needs a program to calculate the number of slices a pizza of any size can be divided into. The
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Answer:

#program in python.

#variables

slice_area=14.125

pi=3.14159

#read diameter

d=int(input("Enter diameter of pizza:"))

#area of pizza

area=pi*(d/2)*(d/2)

#number of slice

no_slice=int(area/slice_area)

#print slice

print("total silce are:",no_slice)

Explanation:

Declare and initialize a variable "slice_area" with 14.125 which is the area of a pizza slice.Initialize a variable "pi" with 3.14159.Then read the diameter of pizza.Find the area of pizza as "area=pi *d/2*d/2".Divide the total area with area of pizza slice.This will be the number of slice.

Output:

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total silce are: 22

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