C programming Question and Answer Day-11

51. Triangle with only border

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

       *
     *  *
    *    *
   *      *
  *        *
 *          *
* * * * * * 

void drawTriangle(char border, char filler, int length)
{
    int start = 2;
    int base = 4;
    int i, sp, j, b;
    for (i = start; i <= length; i++)
    {
        for (sp = 0; sp <= length - i; sp++)
        {
            printf(" ");
        }
        if (i > start)
        {
            printf("%c ", border);
        }
        if (i > start)
        {
            for (b = base; b <= i; b++)
            {
                printf("%c ", filler);
            }
        }
        printf("%c \n", border);
    }

    for (j = base; j < length + base; j++)
    {
        printf("%c ", border);
    }
    printf("\n");
}

void main()
{
    int length = 6;
    clrscr();
    drawTriangle('*', ' ', length);
    getch();
}

52. Program to accept number and print it's factorial.

#include<stdio.h>
#include<conio.h>
void main()
{
int i, fact=1, n;
clrscr();
printf("Enter number : ");
scanf("%d", &n);

for(i=1; i<=n; i++)
{
    fact = fact*i;
}
printf("Factorial is: %d", fact);
getch();
}

53. Program to accept number and print if it is prime number or not.

#include<stdio.h>
#include<conio.h>
void main()
{
int i, n;
clrscr();
printf("Enter number : ");
scanf("%d", &n);

for(i=2; i<=n/2; i++)
    {
        if(n%i==0)
        {
            printf("Number is not Prime");
            getch();
            break;
        }
    }
    printf("Number is Prime");
    getch();
}

54. Program to print 'n' prime numbers.

#include<stdio.h>
#include<conio.h>
#include<process.h>
void main()
{
int i, j, flag=1, n;
clrscr();
printf("Enter number : ");
scanf("%d", &n);

for(i=2; i<=n; i++)
{
    flag=1;
    for(j=2; j<=i/2; j++)
    {
        if(i%j==0)
        {
            flag=0;
            break;
        }
    }
    if(flag==1)
    printf("%d\n", i);
}
getch();
}

55. Program to accept a number and print Fibonacci sequence.

#include<stdio.h>
#include<conio.h>
void main()
{
int pre=1, cur=1, temp, i, n;
//pre means previous number
//cur means current number
clrscr();
printf("Enter number : ");
scanf("%d", &n);
printf("%d\t%d", pre, cur);

for(i=3; i<=n; i++)
{
    temp = cur;
    cur = pre + cur;
    pre = temp;
    printf("\t%d", cur);
}
getch();
}