C LANGUAGE PROGRAM TO DECIDE EITHER NUMBER IS LESSER OR GREATER

WRITE A PROGRAM THAT TAKES TWO DIFFERENT NUMBERS AS INPUT FROM USER, AND DECIDE WHICH NUMBER IS LESSER, GREATER OR EQUAL TO OTHER

#include<stdio.h>       // Header file  “Standard Input and Output”

#include<conio.h>      //Header file “Console input and output”

void main ()

{

            clrscr();                                                            // Clear the output screen

            int number1, number2;                                    // Variable declaration

            printf("Enter first number = ");                       // Display prompt for first number

            scanf("%d",&number1);                                  // Take first input from user

            printf("Enter second number = ");                  // Display prompt for first number

            scanf("%d",&number2);                                  // Take second input from user

            if (number1 > number2)                                  // Check number 1 is greater than number 2

                        printf("%d is greater than %d",number1,number2);

            else if (number1 < number2)                           // Check number 1 is less than number 2

                        printf("%d is less than %d",number1,number2);

            else                                                                  // Otherwise the numbers will be equal

                        printf("%d is equal to %d",number1, number2);

getch();

}

OUTPUT

Enter first number = 4

Enter second number = 10

4 is less than 10

Enter first number = 35

Enter second number = 23

35 is greater than 23

Enter first number = 20

Enter second number = 20

20 is equal to 20

EXPLANATION

Multiple If-Else is used and three different conditions are applied in this program. First condition is checking for the greater number, second condition is checking for the lesser number and third condition is used to check the equality of numbers.

Program will test the condition one by one and when the condition is tested successfully the corresponding output will be displayed and program jumps out of the if-else structure, and the program will be end.

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C LANGUAGE PROGRAM TO DECIDE EITHER NUMBER IS ODD OR EVEN

WRITE A PROGRAM THAT TAKES INPUT FROM USER, AND DECIDE EITHER THIS NUMBER IS EVEN OR ODD

#include<stdio.h>       // Header file  “Standard Input and Output”

#include<conio.h>      //Header file “Console input and output”

void main ()

{

            clrscr();                                                // Clear the output screen

            int number, remainder;                        // Variable declaration

            printf(“Enter any number = “);           // Display prompt for number

            scanf(“%d”,&number);                       // Take input from user

           

            remainder = number % 2;                    // Divide the number with 2, and calculate the remainder

            if (remainder == 0)                              // Decide if remainder is zero its mean it is an even number

                        printf(“This number is even”);           

            else                                                      // otherwise if the remainder is 1, it is an odd number

                        printf(“This number is odd”);

getch();

}

OUTPUT

Enter any number = 24

The number is even

Enter any number = 57

The number is odd

EXPLANATION

The logic I have used in this program is that I did not divide the number by 2, but I have taken the remainder of the input number. You know that even numbers are fully divided by 2 and the remainder becomes zero (0), and if the number is odd the remainder becomes always 1.

This remainder is then used to take decision that when the remainder will be zero, it is even number and if the remainder is 1 the number will be odd. 

C LANGUAGE PROGRAM TO MULTIPLY TWO NUMBERS

WRITE A PROGRAM THAT TAKES TWO DIFFERENT INPUTS FROM USER, MULTIPLY THEM AND FINALLY DISPLAY THE RESULT IN OUTPUT SCREEN

#include<stdio.h>       // Header file “Standard Input and Output”

#include<conio.h>      //Header file “Console input and output”

void main ()

{

            clrscr();                                                // Clear the output screen

            int a, b, product;                                  // Variable declaration

            printf(“Enter first number = “);           // Display prompt for first number

            scanf(“%d”,&a);                                 // Take first input from user

            printf(“Enter second number = “);      // Display prompt for first number

            scanf(“%d”,&b);                                 // Take second input from user

           

            product = a * b;                                               // Formula for multiplying two numbers

            printf(“The product = %d“, product);                        // Display output on screen

           

getch();                                                //Get character

}

OUTPUT

Enter first number = 15

Enter second number = 6

The product = 90

EXPLANATION

1. I have used clrscr() function to clear the output screen, then I have declared three variables “a” and “b” to take input and “product” to store the multiplication result.

2. printf() function is used to display text on output screen, and scanf() function is used to take input into the variables.

3. Then I have used formula product = a * b; to multiply both numbers. After multiplying both numbers I have displayed the result using printf() function.

4. In the end of the program I have used getch() function, this function have no use in the program, I just use it to stop the output screen for a while so that user can see the output.

C LANGUAGE PROGRAM TO ADD TWO NUMBERS

WRITE A PROGRAM THAT TAKES TWO DIFFERENT INPUTS FROM USER, ADD THEM AND FINALLY DISPLAY THE RESULT ON OUTPUT SCREEN

#include<stdio.h>       // Header file “Standard Input and Output”

#include<conio.h>      //Header file “Console input and output”

void main ()

{

            clrscr();                                                // Clear the output screen

            int a, b, sum;                                        // Variable declaration

            printf(“Enter first number = “);           // Display prompt for first number

            scanf(“%d”,&a);                                 // Take first input from user

            printf(“Enter second number = “);      // Display prompt for first number

            scanf(“%d”,&b);                                 // Take second input from user

           

            sum = a + b;                                        // Formula for adding two numbers

            printf(“The sum = %d“, sum);            // Display output on screen

           

getch();                                                //Get character

}

OUTPUT

Enter first number = 10

Enter second number = 20

The sum = 30

EXPLANATION

1. I have used clrscr() function to clear the output screen, then I have declared two variables “a” and “b” to take input and another variable “sum” to store the result.

2. printf() function is used to display text on output screen, and scanf() function is used to take input into the variables.

3. Then I have used formula sum = a + b; to add both numbers. After adding both numbers I have displayed the result using printf() function.

4. In the end of the program I have used getch() function, this function have no use in the program, I just use it to stop the output screen for a while so that user can see the output.

WRITING PROGRAMS IN GW BASIC

Open GW BASIC editor by double clicking on the file.

By default GW basic is in direct mode. Direct mode mean when you write the command it will be executed at once.

Program 1: Write a command for adding two numbers 10 and 20.

Answer: PRINT 10 + 20

Explanation: PRINT command is used to print the result of any action. And to add the numbers we use addition operator ( + ).

Program 2: Write a command for multiplying two numbers 40 and 5.

Answer: PRINT 40 * 5

Explanation: PRINT command is used to print the result of any action. And to multiply the numbers we use multiplication operator ( * ) which is known as asterisk.

NOTE: Similarly for subtraction we will use the negative operator ( - ) and for division we will use division operator ( / ) which is known as forward slash.

Program # 3: Write a command to evaluate the following expression.

40 + 12 * 3 – 2

Answer: PRINT 40 + 2 * 3 -2

Program # 4: Subtract the numbers 100 and 45 by using variables.

Answer:

x = 100

y = 45

PRINT x – y

Explanation: In this program we used two variables x and y and initialize them with values 100 and 45 simultaneously. And then we use the PRINT command to display our result.

What is variable?

A variable is a named memory location which is used to store program’s input and its computational results during program execution.

Program # 5: Write a command that display “HELLO PAKISTAN” on output screen.

Answer: PRINT “HELLO PAKISTAN”

Explanation: In this program we are trying to display a text string “HELLO PAKISTAN”. And whenever we work with strings we use double quotation marks.

What is concatenation?

Answer: Concatenation is the process of combining or joining two or more text strings. And in GW Basic we use plus sign ( + ) to combine.

Program 6: Write a command which concatenate two strings, “PAKISTAN” and “ZINDABAD”.

Answer: PRINT “PAKISTAN” + “ZINDABAD”

Program 7: Write commands to solve the following expressions. (i) 2³ (ii) 3⁷ (iii) square of 10

Answer:

                        PRINT 2^3

                        PRINT 3^7

PRINT 10^2

Explanation: Carrot sign ( ^ ) is used for taking power or exponent.

Program 7: Write a command to calculate the modulus or remainder by dividing 13 with 2.

Answer: PRINT 13 MOD 2

Explanation: MOD command is used to take modulus or remainder of a division.