batch_increment.cpp

#include<stdio.h>

// WWrite a C program to display the following output: 20 40 60 80 100 120

int main ()
{
    int integer = 20;
    
    while(integer <= 120){
        printf("\t%d", integer);
        integer+=20;
    }
    return 0;
}

even_odd_number.cpp

#include<stdio.h>

// Write a C program to display all even numbers between 39 and 65
int main ()
{
    int even_odd_number = 39;
    
    for (int index = 39; index <= 65; index++)
    {
        if(even_odd_number % 2 == 0)
        {
            printf("\n%d", even_odd_number);
        }
        even_odd_number++;
    }
    return 0;
}

factorial.cpp

#include<stdio.h>

// Write a program to calculate the factorial of any given positive integer

int calculate_factorial(int number);

int main ()
{
    calculate_factorial(-1);
    return 0;
}

int calculate_factorial(int number){
    int fact_number = 1;
    if(number < 0) return printf("An invalid number supplied");
    if(number == 0) return printf("%d", 1);
    if(number == 1) return printf("%d", 1);
    
    int iterator = number;
    
    for(int index = 1; index < number; index++){
        fact_number *= iterator;
        iterator--;
    }
    
    printf("%d", fact_number);
}

number_print.cpp

#include<stdio.h>

// Write a C program to display all the integers from 140 to 161
int main ()
{
    int number = 140;
    
    for (int index = 140; index <= 161; index++)
    {
        printf("\n%d", number);
        number++;
    }
    return 0;
}

odd_even_number.cpp

#include<stdio.h>

// Write a C program that displays all odd numbers between 14 and 45
int main ()
{
    int even_odd_number = 14;
    
    for (int index = 14; index < 45; index++)
    {
        if(even_odd_number % 2 != 0)
        {
            printf("\n%d", even_odd_number);
        }
        even_odd_number++;
    }
    return 0;
}

print_integer_while.cpp

#include<stdio.h>

// Write a C program to display all the integers from 59 to 99

int main ()
{
    int integer = 59;
    
    while(integer <= 99){
        printf("\n%d", integer);
        integer++;
    }
    return 0;
}

sum_odds.cpp

#include<stdio.h>

// Write a C program that computes the sum of all odd numbers between 98 and 120

int main ()
{
    int current = 98;
    int sum = 0;
    
    while(current < 120){
        if(current % 2 != 0)
        {
           sum += current; 
        }
        
        current++;
    }
    
    printf("%d", sum);
    return 0;
}

sum_of_integers.cpp

// Write a program to compute the sum of all integers from 52 to 69
int main ()
{
    int sum_of_integers = 0;
    
    for (int current = 52; current <= 69; current++)
    {
        sum_of_integers += current;
    }
    
    printf("%d", sum_of_integers);
    return 0;
}

sum_of_odd_numbers.cpp

#include<stdio.h>

// Modify Program above such that it computes the sum of all the odd numbers from 45 to 80
int main ()
{
    int sum_of_odd_number = 0;
    
    for (int index = 45; index < 80; index++)
    {
        if(index % 2 != 0)
        {
            sum_of_odd_number += index;
        }
    }
    
    printf("\n%d", sum_of_odd_number);
    return 0;
}