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Answer: It is a statment which tells the compiler to insert the contents of stdio(standard input out put) at the particular place. This is a pre-processor directive. It is not part of our program, it is an instruction to the compiler to make it do something.
It is the pre-processor that is part of the compiler which actually gets your program from the file.
It tells the compiler to inlcude the contents of a file, in this case the system file stdio.h.
Answer: The compiler knows it's a system file and therefor must be looked for in a special place, by the fact that the name is enclosed in < >.
Answer: It stands for standard input output because
✅printf() is a Standard Output function.
✅scanf() is a Standard Input function.
In short, if we want to use printf() in a programme then , we need to include stdio header file.
Answer: We need to include conio in a header file and similarly if we are using square root function sqrt() we need to include math in a header file.
Answer:
#include <stdio.h>
#include <stdlib.h>
main(){
int this_number, divisor, not_prime;
this_number = 3;
while(this_number < 100){
divisor = this_number / 2;
not_prime = 0;
while(divisor > 1) {
if(this_number % divisor == 0) {
not_prime = 1;
divisor = 0;
}
else
divisor = divisor-1;
}
if(not_prime == 0)
printf("%d is a prime number\n", this_number);
this_number = this_number + 1;
}
exit(EXIT_SUCCESS);
}
Answer:
3 is a prime number
5 is a prime number
7 is a prime number
11 is a prime number
13 is a prime number
17 is a prime number
19 is a prime number
23 is a prime number
29 is a prime number
31 is a prime number
37 is a prime number
41 is a prime number
43 is a prime number
47 is a prime number
53 is a prime number
59 is a prime number
61 is a prime number
67 is a prime number
71 is a prime number
73 is a prime number
79 is a prime number
83 is a prime number
89 is a prime number
97 is a prime number
6. write a program that prints prime pairs — a pair of prime numbers that differ by 2, for example 11 and 13, 29 and 31?
Answer:
#include <stdio.h>
#include <stdlib.h>
main(){
int this_number, divisor, not_prime;
int last_prime;
this_number = 3;
last_prime = 3;
printf("1, 3 is a prime pair\n");
while(this_number < 100){
divisor = this_number / 2;
not_prime = 0;
while(divisor > 1){
if(this_number % divisor == 0){
not_prime = 1;
divisor = 0;
}
else
divisor = divisor-1;
}
if(not_prime == 0){
if(this_number == last_prime+2)
printf("%d, %d is a prime pair\n",
last_prime, this_number);
last_prime = this_number;
}
this_number = this_number + 1;
}
exit(EXIT_SUCCESS);
}
1, 3 is a prime pair
3, 5 is a prime pair
5, 7 is a prime pair
11, 13 is a prime pair
17, 19 is a prime pair
29, 31 is a prime pair
41, 43 is a prime pair
59, 61 is a prime pair
71, 73 is a prime pair
Answer: We can add comment by using /........../ in C language.
Answer:
-
name can be any combination of upper and lower case letters(a-z, A-Z), digits(0-9), and the character _ No other characters can be used in a variable name.
-
name must start with a letter
-
blanks are not allowed
-
Upper and lower case are allowed e.g. NUMBER , Number, number, nuMBER are all different.
-
should be descriptive (name need to describe the the information that the variable holds)
-
no restriction on the length of variables but make it short and precise
-
names cannot be reserved words e.g float, this,...
acceptable e.g. a, b, c, C, SUM, sum, Count, value, Number, x_dot, Salary, Value1, dhgfhL not acceptable e.g. 1ab inte rest Ca$h Amount-of-loan (- not allowed) int (reserved word)
9. OR is a binary operator and is denoted bu the symbol ||, which is two adjacent pipe symbols. What does (x || y) mean?
Answer: The possible output for (x || Y) is gonna be true or y is true or both are true.
Answer:
If we started following an algorithm that did not terminate, we would never finish executing it!
Answer:
While executing a step, we should know exactly what must be done. If we did not, then there would be no single specific outcome for a particular step. Another good reason is that algorithms are usually translated into computer programs, and computer programs do not leave room for ambiguity.
integers floating numbers characters Booleans Answer: These answers are representative of each of the data types.
integers: number of windows in a room, number of words in a memory, or the rounded-off value of the temperature (negative numbers are integers too), and so on floating numbers: the cost of an item in a store, the precise temperature, and so on characters: the four directions specified by 'N', 'S', 'E', or 'W', one's letter grade in a class, or gender ('F' or 'M') Booleans: the answer to the questions, "Are you female?" or "Do you wish to contribute to the XYZ fund?"
13. Evaluate the results of the following expressions, given the following values for these variables:
x = true, y = true, z = false
x && y || z
!x && y || z
Answer:
a. true. This expression is interpreted as
(x && y) || z
(true && true) || false
(true) || false
true
b. false. This expression is interpreted as
((!x) && y) || z
((!true) && true) || false
(false && true) || false
false || false
false
x = 23, y = –10, z = 12
A. x % z
B. x + y*z
C. x/y*z
D. z % z
Answer:
A. 11
x % z
23 % 12
23/12 = 1 with a remainder of 11
B. –97
The expression is interpreted as
x + (y * z)
23 + (–10 x 12)
23 + (–120)
–97
C. –27.6
x / y * z 23/–10 x 12 (remember that / and * are left associative) –2.3 x 12 –27.6
D. 0
z % z
12 % 12
12/12 = 1 with a remainder of 0
15. Starting with the following initial values, specify the value of each variable at the end of each step, in the following pseudocode.
x = 10, y = 20, z = 30
Set x = x + 20
Set y = y * x
Set y = y % z + x
Set z = z – 20
Set z = z ^ 3 ^ 2
Answer:
Answer
Remember that "B" stands for "byte" (8 bits). So,
100 MB = 100 * 220 * 8 bits = 100 * 1,048,576 * 8 bits
Thus the 100 MB X 32 memory will contain 100 * 1,048,576 * 8 * 32 or 26,843,545,600 bits.
Answer:
No proper initial value exists. Using an uninitialized variable will invariably lead to run-time errors.
Answer:
The first, x == y, is a Boolean expression whose answer is always either true or false, whereas the second, x = y, is an assignment statement.
Answer:
A statement is the basic unit of execution in a program.
Expressions are usually parts of statements. An expression is something that evaluates to a single valu
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