Question

Objectives

1. Ability to receive input from keyboard
2. Use the printf statement as an alternative to cout.
3. Ability to use For loop
4. Ability to use Do-while loop

Program 1:                                                                                                                         

• Create a program called CountUpBy5.
• Input: The program should accept a positive integer n from the user as input. If the given input is not a positive input it should prompt the user to retry
• Hint: use a While-loop for this

• Output: The program should then count all numbers from 0 up to n that are multiples of 5 and print them out on a single line on the screen.
• Hint: use a For-loop or a While-loop for this

Program 2:

• Modify the CountUpBy5 program in Part 1 and call it CountByC to accept another number C, by which it will count up to n, the second user provided number.
• Obviously, you have to ensure that C is greater than 0.
• C may also be a fraction, and does not need to be am integer.

## in C Language only ##

Answer 1

PROGRAM 1:

CODE:

#include <stdio.h>
int main() {
    int n=-1;
    printf("Enter a number: ");
    while(n<0)
    {   scanf("%d",&n);
        if(n<0)
        {
            printf("Retry: ");
        }
        else
        {
            break;
        }
    }
    for(int i=0;i<=n;i++)
    {
        if(i%5==0)
        {
    printf("%d ",i);
        }
    }
    return 0;
}

SCREENSHOT OF CODE and OUTPUT:

PROGRAM 2:

CODE:

#include <stdio.h>
#include<math.h>
int main() {
    int n=-1;
    printf("Enter a number N: ");
    while(n<0)
    {   scanf("%d",&n);
        if(n<0)
        {
            printf("Retry: ");
        }
        else
        {
            break;
        }
    }
    float c=-1;
    printf("Enter a number C: ");
    while(c<0)
    {   scanf("%f",&c);
        if(c<0)
        {
            printf("Retry: ");
        }
        else
        {
            break;
        }
    }
    for(int i=0;i<=n;i++)
    {
        if(fmod(i,c)==0)// fmod is a predefined function to find mod with float        {
    printf("%d ",i);
        }
    }
    return 0;
}

SCREENSHOT OF CODE:

OUTPUT:

I hope I solved your query. In case of doubt feel free to ask in comment section.