Week 1 Lecture Code

// Pantea Aria

// Variables

// if we want to store a value in memory 
// we need a box in memory with a label

// we must know the type of the value in that box

// declaration

// Write a program that stores your age in a variable and prints it.

#include <stdio.h>

int main(void)  {

    // declare a variable and initialised it 
    double age;
    
    // read it from user
    
    
    // print it out
    printf("%.2lf\n", age);

    return 0;
}

// Pantea Aria

// scanf

// scanf is used to get input from the user during program execution.

// Write a program that:
// Asks the user to enter a number in integer
// Reads it using scanf
// Prints it back using printf


#include <stdio.h>

int main(void)  {

    printf ("enter a number in integer:");
    int input;
    scanf("%d", &input);
    
    printf ("My number was %d\n", input);
    return 0;
}    
    

// Pantea Aria

// constants

// A constant is a value that does not change while the program runs

// Write a program that uses a constant double to 
// store the value of π (3.14), and then prints:The value of PI is: 3.14


#include <stdio.h>

#define PI 3.14   

int main(void) {

    printf("The value of PI is: %.2f\n", PI);

    return 0;
}

// Pantea Aria

// arithmetic operators

// Write a program that declares two integers num1 and num2, 
// assigns them values, and then prints the result of:
// add, subtract, product, divide, remainder


#include <stdio.h>

int main(void)  {

    printf ("Enter two numbers in integer:");
    int num1, num2;
    scanf ("%d %d", &num1, &num2);
    
    printf ("add result is %d\n", num1 + num2);
    printf ("subtract result is %d\n", num1 - num2);
    printf ("product result is %d\n", num1 * num2);
    printf ("divide result is %d\n", num1 / num2);
    printf ("remainder result is %d\n", num1 % num2);
    
    return 0;
}    
    
    
    
    
    
    
    

// 3/9/2025
// Pantea Aria

// What does printf do?

#include <stdio.h>

int main() {
    printf("Hello, World!\n");
    return 0;
}

// Pantea Aria

// Variables

// if we want to store a value in memory 
// we need a box in memory with a label

// we must know the type of the value in that box

// declaration

// Write a program that stores your age in a variable and prints it.

// Pantea Aria

// scanf

// scanf is used to get input from the user during program execution.

// Write a program that:
// Asks the user to enter a number in integer
// Reads it using scanf
// Prints it back using printf

// Pantea Aria

// constants

// A constant is a value that does not change while the program runs

// Write a program that uses a constant double to 
// store the value of π (3.14), and then prints:The value of PI is: 3.14

// Pantea Aria

// arithmetic operators

// Write a program that declares two integers num1 and num2, 
// assigns them values, and then prints the result of:
// add, subtract, product, divide, remainder