C programming Question and Answer Day-13

61. Program to calculate Square of 'n' numbers.

#include<stdio.h>
#include<conio.h>
void main()
{
    int n, r, i, sqr=0;
    clrscr();
    printf("\nEnter the range : ");
    scanf("%d", &r);

    for (i = 1; i <= r; i++)
    {
        n = i;
        sqr = n * n;
        printf("\nSquare of %d is :  %d .", n, sqr);
    }
    getch();
}

62. Program to take an alphabet from user and check whether it is a vowel or not.

#include<stdio.h>
#include<conio.h>
void main()
{
    char ch;
    clrscr();
    printf("Enter an alphabet : ");
    scanf("%c", &ch);

    if (ch=='a' || ch=='A' || ch=='e' || ch=='E' || ch=='i' || ch=='I' || ch=='o' || ch=='O' || ch=='u' || ch=='U')
        printf("%c is a vowel.", ch);
    else
        printf("%c is not a vowel.", ch);
    getch();
}

63. Program to take two numbers and check whether they are amicable numbers or not.

#include<stdio.h>
#include<conio.h>

//check function
int check(int a, int b)
{
    int s = 0, i;
    for (i = 1; i < a; i++)
    {
        if (a % i == 0)
        {
            s = s + i;
        }
    }

    if (s == b)
    {
        s = 0;
        for (i = 1; i < b; i++)
        {
            if (b % i == 0)
            {
                s = s + i;
            }
        }

        if (s == a)
            return 1;
        else
            return 0;
    }
    return 0;
}

void main()
{
    int a, b;
    clrscr();
    printf("Enter 1st number : ");
    scanf("%d", &a);
    printf("Enter 2nd number : ");
    scanf("%d", &b);

    if (check(a, b))
    {
        printf("\n%d and %d are Amicable Numbers.", a, b);
    }
    else
    {
        printf("\n%d and %d are not Amicable Numbers.", a, b);
    }
}

64. Program to accept a number and print the factors of that number.

#include<stdio.h>
#include<conio.h>
void main()
{
    int n, i;
    clrscr();
    printf("Enter a number : ");
    scanf("%d", &n);
    printf("Factors of %d are : ", n);
    for (i = 1; i <= n; ++i)
    {
        if (n % i == 0)
            printf("\n%d ", i);
    }
    getch();
}

65. Program to accept two integer numbers and print the GCD(Greatest Common Divisor).

#include<stdio.h>
#include<conio.h>
void main()
{
    int x, y, m, i;
    clrscr();
    printf("Enter 1st number : ");
    scanf("%d", &x);
    printf("Enter 2nd number : ");
    scanf("%d", &y);

    if (x > y)
        m = y;
    else
        m = x;

    for (i = m; i >= 1; i--)
    {
        if (x % i == 0 && y % i == 0)
        {
            printf("GCD of two number is : %d", i);
            break;
        }
    }
    getch();
}