1 Array Knowledge Understand the execute technique of array Skill Can write application program...

KnowledgeUnderstand the execute technique of array

Skill Can write application program using one and two dimensional array

Why Array? Assume that you were asked to write a

program that accept 10 student marks,

calculating average mark, and then print

a number of students that get more than

average mark.

How to store all these marks?

#include <stdio.h>

void main() {int mark1, mark2, mark3, mark4, mark5, mark6, mark7, mark8, mark9, mark10;int bil=0, total_mark = 0;float Average_mark;

printf(“\nRead 10 test marks : \n”);scanf(“%d%d%d%d%d%d%d%d%d%d”, &mark1, &mark2,

&mark3, &mark4, &mark5, &mark6, &mark7, &mark8, &mark9, &mark10);

total_mark = mark1 + mark2 + mark3 + mark4 +mark5 + mark6 + mark7 + mark8 + mark9 + mark10;

Average_mark = (float) total_mark/10;

Read student marks

Solving Without Using Array

Solving Without Using Array#include <stdio.h>

Calculate the total mark

Solving Without Using Array

Calculate the average mark

#include <stdio.h>

if (mark1 > Average_mark) bil++;

printf(“\nAverage mark = %.2f”, purata);printf(“\n Number of students that get more than Average mark %d”, bil);

What would happen if there were 100 students?

Solving Without Using ArrayCalculate number of students which get more than Average mark

Solving Without Using Arrayif (mark1 > Average_mark)

bil++;if (mark2 > Average_mark)

bil++;

printf(“\nAverage mark = %.2f”, Average_mark);printf(“\n Number of students that get more than average mark = %d”, bil);

What would happen if there were 100 students?

Print the result

One-dimensional Array Instead of using 10 variables to represent 10

student marks,another technique is using one-dimensional array for storing a list of marks.

Array is a collection of memory location that is used for storing data from same type. Each memory location in array is referred by array’s name and location memory index.

One Dimensional Array67

For printing each mark in array:

for (i=0; i < 10; i++)printf("%d ", mark[i])

Array name

One Dimensional Array67

For printing each mark in array:

for (i=0; i < 10; i++)printf("%d ", mark[i])

Array Index

One-Dimensional Array Array declaration syntax

data_type name_of_array[integer_expression];

Example:

int mark[10];

In C programming, each index in array is start from 0. Thus, the last index number in one array of sized n is n-1.

Array Controlling One way for giving initial value to array’s

element is giving a list of initial value in array declaration.

Array Controlling Example:

int month[12] = { 31, 28, 31, 30, 31,30, 31, 31, 30, 31, 30, 31 };

[1][2][3][4]

[5][6]

[7][8][9]

Array Controlling If the list of initial value is

less than array size, the rest element will be given 0 value

int month[12] = { 31, 28, 31, 30, 31 }

[1][2][3][4]

[5][6]

[7][8][9]

Array Controlling Array size can be ignore

in declaration if it is given by initial value list. Array size will be set based on a number of data in their list.

int month[ ] = { 31, 28, 31, 30, 31 }

[1][2][3][4]

Array Assignment Value assignment to array’s element is

same as value assign to variable.

Assignment to array can be done element by element.

Array Assignment Example:

tinggi

??????

[1][2]

[3][4]

float tinggi[5];tinggi[0] = 31.34;tinggi[1] = 28.11;tinggi[2] = 31.25;tinggi[3] = 30.94;tinggi[4] = 31.68;

Array Assignment

tinggi

??????

[1][2]

[3][4]

Example:

Array Assignment

tinggi

??????

[1][2]

[3][4]

Example:

Array Assignment

tinggi

??????

[1][2]

[3][4]

Example:

Array Assignment

tinggi

30.94???

[1][2]

[3][4]

Example:

Array Assignment

tinggi

30.9431.68

[1][2]

[3][4]

Example:

Array Assignment In certain situation, array assignment

can be write using looping.

number

??????

[0][1][2]

[3][4]

int number[5], i;for (i=0; i < 5; i++)

number[i] = 0;

can be write using looping

number

??????

[0][1][2]

[3][4]

number[i] = 0;

number

??????

[0][1][2]

[3][4]

number[i] = 0;

0<5TRUE

number

??????

[0][1][2]

[3][4]

number[i] = 0;

number

??????

[0][1][2]

[3][4]

number[i] = 0;

number

??????

[0][1][2]

[3][4]

number[i] = 0;

1<5TRUE

number

??????

[0][1][2]

[3][4]

number[i] = 0;

number

??????

[0][1][2]

[3][4]

number[i] = 0;

number

??????

[0][1][2]

[3][4]

number[i] = 0;

2<5TRUE

number

??????

[0][1][2]

[3][4]

number[i] = 0;

number

??????

[0][1][2]

[3][4]

number[i] = 0;

number

??????

[0][1][2]

[3][4]

number[i] = 0;

3<5TRUE

number

[0][1][2]

[3][4]

number[i] = 0;

number

[0][1][2]

[3][4]

number[i] = 0;

number

[0][1][2]

[3][4]

number[i] = 0;

4<5TRUE

number

[0][1][2]

[3][4]

number[i] = 0;

number

[0][1][2]

[3][4]

number[i] = 0;

number

[0][1][2]

[3][4]

number[i] = 0;

5<5FALSE

number

[0][1][2]

[3][4]

number[i] = 0;

Example of Using Array

Program to process 3 student mark

Read studentsmark

Calculate number of

mark greater than Average

Calculate Total mark

All Studentsmark

CalculateAverage mark

All Studentsmark

Totalmark

Total mark

Averagemark

All studentsMark,Average mark

number

Print the result

Average mark, number

Example of Using Array#include <stdio.h>void main() {

int mark[3], i, bil, total_mark;float Average_mark;

for (i = 0; i < 3, i++) {printf(“Enter mark %d : “, i);scanf(“%d”, &mark[i]);

}total_mark= 0;for (i = 0; i < 3; i++)

total_mark += mark[i];Average_mark = (float) total_mark / 3;bil = 0;for (i = 0; i < 3; i++ )

if (mark[i] > Average_mark)bil++;

printf(“\nAverage mark= %.2f”, Average_mark);printf(“\nNumber of students that get more than average mark = %d\n”, bil);

Read student marks

Calculate total mark

Calculate the average mark

#include <stdio.h>void main() {

Example of Using Array

Calculate the number of student that get more than average mark

Print the result

printf(“\nAverage mark= %.2f”, Average_mark);printf(“\nNumber of mark that are greater than average = %d\n”, bil);

total_mark

Average_mark

Example of Using Array0

total_mark

Average_mark

total_mark

Average_mark

0<3TRUE

Enter mark 0: 70_

total_mark

Average_mark

Enter mark 0: 70_

total_mark

Average_mark

Enter mark 0: 70

total_mark

Average_mark

1<3TRUE

Enter mark 0: 70Enter mark 1: 30

total_mark

Average_mark

Enter mark 0: 70Enter mark 1: 30 _

total_mark

Average_mark

Enter mark 0: 70Enter mark 1: 30__

total_mark

Average_mark

2<3TRUE

Enter mark 0: 70Enter mark 1: 30Enter mark 2: 80_

total_mark

Average_mark

Enter mark 0: 70Enter mark 1: 30Enter mark 2: 80__

total_mark

Average_mark

total_mark

Average_mark

3<3FALSE

total_mark

Average_mark

total_mark

Average_mark

total_mark

Average_mark

0<3TRUE

total_mark

Average_mark

total_mark

Average_mark

total_mark

Average_mark

1<3TRUE

total_mark

Average_mark

total_mark

Average_mark

total_mark

Average_mark

2<3TRUE

total_mark

Average_mark

total_mark

Average_mark

total_mark

Average_mark

3<3FALSE

total_mark

Average_mark

printf(“\nAverage mark= %.2f”, Average_mark); printf(“\nNumber of students that get more than average mark = %d\n”,

bil);}

total_mark

Average_mark

total_mark

Average_mark

total_mark

Average_mark

mark0<3TRUE

total_mark

Average_mark

Enter mark 0: 70Enter mark 1: 30Enter mark 2: 80_ i

total_mark

Average_mark

total_mark

Average_mark

total_mark

Average_mark

mark1<3TRUE

total_mark

Average_mark

total_mark

Average_mark

total_mark

Average_mark

mark2<3TRUE

total_mark

Average_mark

total_mark

Average_mark

total_mark

Average_mark

total_mark

Average_mark

mark3<3FALSE

Enter mark 0: 70Enter mark 1: 30Enter mark 2: 80

Average mark= 60.00Number of students that get more than average mark = 2 _

total_mark

Average_mark

1 Array Knowledge Understand the execute technique of array Skill Can write application program...

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