Practicle test help

1)Create function to take two integer arguments and compare them and if no1 > no2 then swam them.

                 void swapGreater(int number1, int number2);

2)Create function to take an array as a input argument and shift larger walue in to the last array element.

                 void arraySort(int *array);

                 first array look - 12, 300 ,4 ,56 , 67, 3
                 after swap  - 12 , 4,56,67,3,300

3) Create function to read values to array from key board.

                void takeInputs(int *array);

4) Create function to dsplay values from array .

                void displayValues(int *array);

5) Create the main mehod and do the following.

                      create array with 6 elements;
                      take values from keybord using takeInputs function.

                     do 5 times arraySort function call to the array.

                     display the array using displayValues function

** this question is 100% not the same , but the program u have to write for this problem is same as the practical test.

ANSWER..............

#include<stdio.h>

void swapGreater(int *no1, int *no2);

void arraySort(int array[]);

void takeInput(int *array);

void display(int *array);

main(){

int array[6],i;

takeInput(array);

printf("before sort !! \n");

display(array);

for(i=0;i<5;i++){

arraySort(array);

}

printf("after sort !! \n");

display(array);

}

void swapGreater(int *no1, int *no2){

int temp;

if(*no1 > *no2){

temp = *no1;

*no1 = *no2;

*no2 = temp;

}

}

void arraySort(int array[]){

int i;

for(i=0;i<5;i++){

swapGreater(&array[i],&array[i+1]);

}

}

void takeInput(int *array){

int i;

printf("enter 6 values \n");

for(i=0;i<6;i++){

scanf("%d",&array[i]);

}

}

void display(int *array){

int i;

for(i=0;i<6;i++){

                printf("%d \n",array[i]);

        }

}

Exercises (arrays, pointers, functions).

Exercises (arrays, pointers, functions).

1. Write a program to update the value of the double variable flt_num from 123.45 to 543.21 by

using a double pointer.

2. Given a character variable ch and ch = ‘A’, write a program to update the value of ch to

character 'a' by using a pointer.

3. Given an integer array initialized as (int niceArray[]={23,4,4,56,45,5,6,1,34,787};), write a

program to increase each array element by 1000 using a nother pointer.

4. Write a function to calculate a factorial value. Then use that function to calculate 6C2 (possible

combinations in selecting 2 out of 6) and display the value.

(Hint: int factorial(int f1); combinations=factorial(6)/(factorial(2)*factorial(4)); )

5. Write seperate functions,

1. to read an integer value from the keyboard, (int readNumber(); )

2. to display two integer values, (void display(int a,int b); )

3. to swap two integer values, (void swap(int *c,int *d); )

Write a program to read two integer values to two variables, display them

before their values are swaped between them then swap those values and

finally display the two variables. (Hint: Use above functions)

Loop Assignment Answers

Loop Assignment Answers

1) Write a program to display numbers from 1 to 250.

2) Write a program to calculate the sum of all the numbers less than a given number n.

ex: output

Enter number : 3

6

Enter number : 5

15

3) Write a program to display “hello world” for every time we enter the character 'y' and stop the

program when we enter the character 'n'. For any other character program should not stop or

display anything.

4) Write a program to calculate the factorial value for a given number N.

5) Write a program to calculate number of possible combinations that we can have when we

selecting r number of elements from n number of different elements. This can be calculated by

calculating the value n!/(r!*(n-r)!).

Assignment Answers

Assignment Answers

1) Write a program to check the given number is positive or negative.

2) Write a program to Add two numbers if the first one is greater than the second number if not

display an error message.

3) Write a program to display the grade (A, B, C or D) according to the given mark.

hint: A(between 100 and 75)/ B(between 74 and 65)/ C(between 64 and 55)/ D(between 54 and

0)

4) Write a program to read a two characters and display them if both are not equal.

5) Write a program to input a temperature reading in either Celsius (c) or Fahrenheit (f)scale and

convert it to the other scale. The temperature reading consists of a decimal integer followed by

letter “F” or “f” if the temperature is in Fahrenheit scale or letter “C” or “c” if it is in Celsius

scale. You may use a similar format for the output of the program.

Pointers

Pointers. 

A pointer is a variable whose value is an address.

                  int thing;            /* define a thing */
int *thing_ptr;   /* define a pointer to a thing */ 


There are things and pointers to things. Knowing the difference between the two is very important.
The address of thing is 0x1000. Addresses are automatically assigned by the C compiler to every variable. Normally, you don't have to worry about the addresses of variables, but you should understand that they're there.
Our pointer (thing_ptr) points to the variable thing. Pointers are also called address variables because they contain the addresses of other variables. In this case, our pointer contains the address 0x1000.

Pointer Operator Syntax. 

The operator ampersand (&) returns the address of a thing which is a pointer. The operator asterisk (*) returns the object to which a pointer points. These operators can easily cause confusion. 

Assignment 01-cmis1223

Assignment 01-cmis1223

1). School Teacher of a Primary School want a software program to calculate the average marks for
Maths, English, Science and Art for a Student.
1. Use the first three steps of the Development Cycle(Define the
problem:input/output/processing, Outline the solution:main Computation/input
variables/intermediate results, Develop an algorithm) to come up with an algorithm.


Inputs : Maths mark , Englsh mark , Science mark
Process :  Calculate average marks
Output  :   Average mark

  calAverage
1.sum <-  (math_mark + English_mark+Science_marrk)
2.average <- sum / 3


2. Write a C program for the Problem.

#include<stdio.h>

main(){

float M_marks , E_marks , Sc_marks;
float Average;

printf("Please enter Maths marks \n");
scanf("%f \n"&M_marks);
printf("Please enter English marks \n");
scanf("%f \n"&E_marks);
printf("Please enter English marks \n");
scanf("%f \n"&Sc_marks);

Average = (M_marks+E_marks+Sc_marks)/3;

printf("Average marks for three subject is %f \n", Average);
}



2). This program is developed to calculate the Age of a living person.

#include <stdio.h>
main() {
int day,month,year;
int bday,bmonth,byear;
printf("\n********Quiz01!********\n");
printf("\nEnter the Todays Date:\f");
scanf("%d/%d/%d",&day,&month,&year);
printf("\nEnter your Birth Day:\f");
scanf("%d/%d/%d",&bday,&bmonth,&byear);
printf("Your Age for Today: %d\n",year-byear);
}


1. Explain the Execution of this program.

#include <stdio.h>

main() {

int day,month,year;     // create memory locations in the main memory

int bday,bmonth,byear; // create memory locations in the main memory

printf("\n********Quiz01!********\n"); // print the text on screen  ********Quiz01!********

printf("\nEnter the Todays Date:\f"); // prin the text Enter the Todays Date

scanf("%d/%d/%d",&day,&month,&year); // blinking curser , values are assign to the relavant memory locations

printf("\nEnter your Birth Day:\f"); // print the text Enter your Birth Day

scanf("%d/%d/%d",&bday,&bmonth,&byear);  //blinking curser , values are assign to the relavant memory locations


printf("Your Age for Today: %d\n",year-byear); // your age for tody year-byear

}




2. Does this program correctly calculates the age of a person? If not explain why?

NO , there is unused variables in this program , day , bday , month , bmonth . Tocalulate the age precisely  have to use this variables as well .

right code to calulate the age precisely -
printf("Your Age for Today: %d  yaers %d  months %d days \n",year-byear , month - bmonth , day-bday);

Arrays

Hi friends..... ,

We have already talk about simple data types, simple variable can hold only one value at any time during program execution ,although that value is change. We use data structures to save multiple values at the same time.The array is a one kind of data structure.

Lets see about Arrays.........


Arrays of any type can be formed in C. The syntax is simple:
type name[dim];
An array is a group of related data items that all have the same name and the same data type.
Arrays can be of any data type we choose.
An array’s data items are stored contiguously in memory.
Each of the data items is known as an element of the array.  Each element can be accessed individually.


In C, arrays starts at position 0. The elements of the array occupy adjacent locations in memory. C treats the name of the array as if it were a pointer to the first element--this is important in understanding how to do arithmetic with arrays. Thus, if v is an array, *v is the same thing as v[0], *(v+1) is the same thing as v[1], and so on:

int a[5];
An array as a whole has the following properties:
Its elements are contiguous in memory.