Spiral Matrix

#include <stdio.h>
#define R 3
#define C 3

void spiralPrint(int m, int n, int a[R][C])
{
    int i, k = 0, l = 0;

    /*  k - starting row index
        m - ending row index
        l - starting column index
        n - ending column index
        i - iterator
    */

    while (k < m && l < n)
    {
        /* Print the first row from the remaining rows */
        for (i = l; i < n; ++i)
        {
            printf("%d ", a[k][i]);
        }
        k++;

        /* Print the last column from the remaining columns */
        for (i = k; i < m; ++i)
        {
            printf("%d ", a[i][n-1]);
        }
        n--;

        /* Print the last row from the remaining rows */
        if ( k < m)
        {
            for (i = n-1; i >= l; --i)
            {
                printf("%d ", a[m-1][i]);
            }
            m--;
        }

        /* Print the first column from the remaining columns */
        if (l < n)
        {
            for (i = m-1; i >= k; --i)
            {
                printf("%d ", a[i][l]);
            }
            l++;
        }
    }
}

/* Program to test above functions */
int main()
{
    int a[R][C] = { {1,  2,  3},
                    {8,  9,  4},
                    {7,  6,  5}
    };

    spiralPrint(R, C, a);
    return 0;
}

   

Output
1 2 3 4 5 6 7 8 9

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Clear Screen without clrscr() function call

#include<stdio.h>
void clearmyscreen();
void main()
 {
  printf("Hello");
  getch();
  clearmyscreen();
  printf("World");
  getch();
 }

void clearmyscreen()
 {
  system("cls");
 }

   

Output
World

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Print the Truth Table

#include<stdio.h>

int OR(int,int);
int AND(int,int);
int XOR(int,int);
int NOT(int);

void main()
{
 int a,b,ch,o;

 printf("\n-:MENU:-\n1.AND\n2.OR\n3.NOT\n4.XOR\n0.Exit\n");
 do{
    printf("\nEnter Choice:");
    scanf("%d",&ch);

    switch(ch)
     {
      case 1:
             printf ("\nTruth Table for AND\nA B  \tO");
             for(a=0;a<=1;a++)
             {
              for(b=0;b<=1;b++)
                { 
                  o=AND(a,b);
                  printf("\n%d %d \t%d",a,b,o);
                }
             }
              break;
      case 2:
             printf ("\nTruth Table for OR\nA B  \tO");
             for(a=0;a<=1;a++)
             {
              for(b=0;b<=1;b++)
                {
                o=OR(a,b);
                printf("\n%d %d \t%d",a,b,o);
                }
             }
              break;
      case 3: 
             printf ("\nTruth Table for NOT\nA  \tO");
             for(a=0;a<=1;a++)
             {
             o=NOT(a);
             printf("\n%d  \t%d",a,o);
             }
              break;
      case 4:
             printf ("\nTruth Table for XOR\nA B  \tO");
             for(a=0;a<=1;a++)
             {
              for(b=0;b<=1;b++)
                {
                o=XOR(a,b);
                printf("\n%d %d \t%d",a,b,o);
                }
             }
              break;

      case 0: exit();
              break;
             default: printf("\nError");
             }
      }while(ch!=0);

}


int OR(int a, int b)
{
if(a==0&&b==0)
   return 0;
else
   return 1;
}

int AND(int a, int b)
{
if (a==1&&b==1)
   return 1;
else
   return 0;
}

int NOT(int a)
{
if (a==0)
   return 1;
else
   return 0;
}

int XOR(int a,int b)
{
if (a==0&&b==1||a==1&&b==0)
   return 1;
else
   return 0;
}

  

Output
-:MENU:-
1.AND
2.OR
3.NOT
4.XOR
0.Exit
Enter Choice: 3 
Truth Table for NOT
A   O
1   0
0   1

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