[C] chapter 02 : Self Review Exercise

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2.1 Fill the blanks in each of the following

 

a) every C program begins execution at the function -----.

main

b) Every functions's body begins with ----- and ends with -----.

{ , }

c) Every statement ends with an -----

semicolon (;)

d) The ----- standard library functions displays information on the screen.

printf

e) The escape sequence \n represents the ----- character, which causes the cursor to position to the beginning of the next line on the screen.

newline

f) The ----- Standard Library function is used to obtain data from the keyboard.

scanf

g) The conversion specifier ----- is used in a scanf format control string to indicate that an integer will be input and in a printf format control string to indicate that an integer will be output.

%d

h) Whenever a new value is placed in a memory location, that value overrides the previous value in that locatoin. this process is said to be -----.

overriding destructive

i) When a value is read from a memory location, the value in that location is preserved; this process is said to be -----

? nondescturctive

j) The ----- statement is used to make decisions. 

if

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2.2 State whether each of the following is true or false. If false, explains why.

 

a) F (not beginning with the new line)

b) F (not display on the screen)

c) T

d) T

e) T

f) F (not identical. C is case sensitive language)

g) T

h) F (not printf. but scanf.)

i) F (not only integer but also anything (e.g float, char etc.)) 

   T ->'remainder operator(%)' can be use only with integer operands.

틀린이유 ) 형식지정자 %로 봄. 나머지 연산자는 오직 정수 연산항들에만 사용할 수 있음.

j) F (not have same level of precedence, first is *, / , % and the next is + and -)

k) F (not must contain three printf. It can be seperate by using a newline(\n))

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2.3 Write a single C statement to accomplish each of the following.

 

a)

int c, thisVariable, q76354, number;

b)

printf("Enter a integer : \n");

c)

int a;
scanf("%d", &a);

d)

if(num != 7)
	printf("The variable number is not equal to 7\n");

e)

printf("this is a C program");

f) so that the first line ends with c.

printf("This is a C\n");
printf("program.");

g)

printf("This\nis\na\nC\nprogram.");

h)

printf("This\tis\ta\tC\tprogram.");

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2.4 Write a statement (or comment) to accomplish each of the following : 

 

// a : program will calculate the product of three inteers.
printf("Enter three integers : "); // b
int x,y,z; // c
scanf("%d %d %d", &x, &y, &z); // d
int result = x*y*z; // e
printf("The product is : %d", result); // f

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2.5 Using the statements you wrote in Ex 2.4, write a complete program that calculates the product of three integers.

#include <stdio.h>

int main(void){
	// a : program will calculate the product of three inteers.
	printf("Enter three integers : "); // b

	int x,y,z; // c	
	scanf("%d %d %d", &x, &y, &z); // d

	int result = x*y*z; // e
	printf("The product is : %d", result); // f
}

 

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2.6 Identify and correct the errors in each of the following statements:

 

a)

printf("The value is %d\n", number);

b)

scanf("%d %d", &number1, &number2);

c)

if(c < 7){
	printf("C is less than 7\n");
}

d)

if(c >= 7){
	printf("C is greater than or equal to 7\n");
}