Question

3. I. Calculate 10 factorial with for-loop. Compare the result you obtained with factorial(10). II. Calculate the greatest common divisor of the numbers 258, 387, 516 with the help of control structures (for, while, if, etc.)

Answer 1

C Code : For factorial

#include<stdio.h>

#include<conio.h>

// declare a factorial function

int factorial(int num){

    // initializing a variable

    int i,fact=1;

    // use for loop find fact

    for(i=1;i<=num;i++){

         fact=fact*i;    

     }

    // return the value of fact

    return fact;

}

//main

int main(){

  // initializing a variable

  int number;    

  // ask for the input

  printf("Enter a number: ");    

  scanf("%d",&number);    

  // call the function and print the result

  printf("Factorial of %d is: %d",number,factorial(number));

  return 0;

}

OUTPUT:

C Code : For greatest common divisor

#include<stdio.h>

#include<conio.h>

// declare a factorial function

int greatestNumber(int x, int y, int z){

    // if x is greater than y and z then return x

    if(x>=y && x>=z){

        return x;

    }

    // if y is greater than x and z then return y

    else if(y>=x && y>=z){

        return y;

    }

    // if z is greater than x and z then return z

    else if(z>=x && z>=y){

        return z;

    }

}

//main

int main(){

    // initializing a variable

    int a,b,c;

    // ask for the input variable

    printf("Enter first numbers: ");

    scanf("%d",&a);

    printf("Enter second numbers: ");

    scanf("%d",&b);

    printf("Enter third numbers: ");

    scanf("%d",&c);

    int i;

    // call the function

    for(i=greatestNumber(a,b,c); i>=1; i--){

        // check the conditions

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

            break;// break the loop

        }

    }

   // print the result

    printf("GCD is : %d\n",i);

  return 0;

}

OUTPUT: