C Language Programming Introduction Lecture

COMPUTER PROGRAM
• A computer program is a sequence or set of instructions in a programming language for a computer
to execute. It is one component of software, which also includes documentation and other intangible
components.

WRITE THE BASIC STRUCTURE OF C PROGRAMMING
LANGUAGE.
#include <stdio.h>
int main()
{
// Print Name
printf("Name : Alexandra Abramovn");
// Print Date of Birth
printf("DOB : July 14, 1975n");
// Print Mobile Number
printf("Mobile : 99-9999999999n");
// Indicate successful execution
return(0);
}

EXPLANATION
• #include <stdio.h>: This line includes the standard input-output library, which contains functions
for reading and writing data to and from the console.
• int main(): This is the main function of the program, where execution begins. It returns an integer
value, typically 0, to indicate successful execution.
• Inside the "main()" function, there are three printf statements. The "printf()" function is used to print
formatted text to the console. Each printf statement prints a line of text with specific information:
• printf ("Name : Alexandra Abramovn"); prints "Name : Alexandra Abramov" followed by a newline
character, which moves the cursor to the next line.
• printf ("DOB : July 14, 1975n"); prints "DOB : July 14, 1975" followed by a newline character.
• printf ("Mobile : 99-9999999999n"); prints "Mobile : 99-9999999999" followed by a newline character.
• return(0);: This line indicates the end of the main function and returns 0.

THINGS TO KNOW
• printf is used for displaying output with formatted strings.
• scanf is used for reading input with formatted strings.
• %d in scanf tells the program to expect an integer input
• i.e. %d is a way of telling the program to handle integer data when displaying output (with printf) or
when reading input (with scanf).
C is case sensitive. All commands in C must be lowercase.

WRITE A C PROGRAM TO INPUT TWO NUMBERS AND SHOW
ADDITION & SUBTRACTION.
#include <stdio.h>
int main()
{
int n1, n2;
printf("Enter First number: ");
scanf("%d", &n1);
printf("Enter Second number: ");
scanf("%d", &n2);
printf("Sum of Given Two Numbers =: %d n", n1+n2);
printf("Subtraction of Given Two Numbers =: %d n", n1-
n2);
printf("Product of Given Two Numbers =: %d n", n1*n2);
return 0;
}

WRITE A C PROGRAM TO INPUT TWO NUMBERS AND DIVIDE.
#include<stdio.h>
int main(){
int num1, num2, quotient;
//Asking for input
printf("Enter first number: ");
scanf("%d", &num1);
printf("Enter second number: ");
scanf("%d", &num2);
//Computing quotient
quotient = num1 / num2;
printf("Quotient: %d", quotient);
return 0;
}

WRITE A C PROGRAM TO SHOW THE SQUARE OF AN
INPUTTED NUMBER.
#include <stdio.h>
int main()
{
int number;
printf("Enter a number: ");
scanf("%d", &number);
printf("Square of Number is: %dn",
number*number);
return 0;
}

WRITE A C PROGRAM TO ASK A NUMBER INPUT FROM A USER
AND DETERMINE WHETHER THE NUM IS EVEN OR ODD.
#include <stdio.h>
int main()
{
int n;
printf("Enter A number: ");
scanf("%d", &n);
if (n % 2 == 0)
{
printf("%d is an even number.n", n);
}
else
{
printf("%d is an odd number.n", n);
}
return 0;
}

WRITE A C PROGRAM TO SHOW THE TABLE OF AN INPUTTED
NUMBER.
• #include <stdio.h>
• int main() {
• int number;
• // Input number from user
• printf("Enter a number: ");
• scanf("%d", &number);
• // Display multiplication table
• printf("Multiplication table for %d:n", number);
• for (int i = 1; i <= 10; ++i) {
• printf("%d x %d = %dn", number, i, number * i);
• }
• return 0;
• }

H.W
• Write a C program to compute the perimeter and area of a rectangle with a length of 7 inches and
width of 5 inches.
Expected Output:
Perimeter of the rectangle = 24 inches
Area of the rectangle = 35 square inches
• Write a C program to compute the perimeter and area of a circle with user input radius.
Expected Output Example:
Perimeter of the Circle = 37.680000 inches
Area of the Circle = 113.040001 square inches
• Write a C program to convert specified days into years, weeks and days.
Note: Ignore leap year.

C Language Programming Introduction Lecture

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