Question

All Code should be written in C:

1. Write a C program which prompts the user to enter two integer values. Your program should then print out all numbers between 1 and 1000 that are divisible by both of those numbers.

2. Modify your program from question 1 such that the first 1000 numbers that are divisible by both numbers are printed out, instead of numbers up to 1000.

3. Using dynamic memory, allocate memory for an array of 100 floating point numbers. Fill this array with random numbers between 0 and 1, and print them to the screen. HINT: Use RAND_MAX, which represents the largest possible value returned by the rand() function.

4. Modify question 3 such that the program writes the values to a file called "floats.txt" in text format, one per line, instead of to the screen

Answer 1

Here is the completed code for each part. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

//CODE FOR PART 1

#include<stdio.h>

int main(){

                //declaring two integers

                int a, b;

                //asking for two integers

                printf("Enter two integer values: ");

                //reading two integers

                scanf("%d %d",&a,&b);

                //looping from i=1 to i=1000

                for(int i=1;i<=1000;i++){

                                //if i is divisible by a and b, printing it

                                if(i%a==0 && i%b==0){

                                               printf("%d\t",i);

                                }

                }

                printf("\n");

                return 0;

}

//CODE FOR PART 2

#include<stdio.h>

int main(){

                //declaring two integers

                int a, b;

                //asking for two integers

                printf("Enter two integer values: ");

                //reading two integers

                scanf("%d %d",&a,&b);

                int i=1; //starting value

                int counter=0; //count of numbers divisible by a and b

                //loops until counter hits 1000

                while(counter<1000){

                                //if i is divisible by a and b, printing it

                                if(i%a==0 && i%b==0){

                                               printf("%d\t",i);

                                               //incrementing counter

                                               counter++;

                                }

                                //next value

                                i++;

                }

                printf("\n");

                return 0;

}

//CODE FOR PART 3

#include<stdio.h>

#include<stdlib.h>

int main(){

                //creating a dynamic float array of 100 elements

                float *arr = (float*) malloc(100 * sizeof(float));

                //looping from i=0 to i=99

                for(int i=0;i<100;i++){

                                //generating a random number between 0 and 1, assigning to arr[i]

                                arr[i]=(rand()/(float)RAND_MAX);

                                //printing the number

                                printf("%f\n",arr[i]);

                }

                //de allocating memory

                free(arr);

                return 0;

}

//CODE FOR PART 4

#include<stdio.h>

#include<stdlib.h>

int main(){

                //creating a dynamic float array of 100 elements

                float *arr = (float*) malloc(100 * sizeof(float));

                //opening a file 'floats.txt' in write mode

                FILE* op=fopen("floats.txt","w");

                //looping from i=0 to i=99

                for(int i=0;i<100;i++){

                                //generating a random number between 0 and 1, assigning to arr[i]

                                arr[i]=(rand()/(float)RAND_MAX);

                                //printing the number to the file

                                fprintf(op,"%f\n",arr[i]);

                }

                //de allocating memory

                free(arr);

                //closing file, saving changes

                fclose(op);

                return 0;

}