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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Find the maximum occurrence of a character in a string

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

int main() {
   char str[20], ch;
   int count = 0, i,j=0 , max;
   int arr[10];
   printf("\nEnter a string : ");
   scanf("%s", &str);

   printf("\nEnter the character to be searched : ");
   scanf("%c", &ch);
   for (i = 0; str[i] != '\0'; i++) {
      if (str[i] == ch)
         count++;
      else if(count != 0)
      {
          arr[j] = count;
          j++;
          count = 0;
      }
   }
   arr[j]=count;
   max = 0;
       for(i=0;i<=j;i++)
        if(max<arr[i])
         max=arr[i];
   if (max == 0)
      printf("\nCharacter '%c'is not present", ch);
   else
   {
       printf("\nMaximum occurrence of character '%c' : %d", ch, max);
   }
   return (0);
}

   

Output

Enter a string : aabbbaaab

Enter the character to be searched :
Maximum occurrence of character 'a' : 3

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Solve Quadratic Equation

#include <stdio.h>
#include <math.h>
void main() 
{
 float a,b,c,d,temp,r1,r2; 
 printf("\nEnter the value of a\t:");
 scanf("%f",&a); 
 printf("Enter the value of b\t:");
 scanf("%f",&b);
 printf("Enter the value of c\t:");
 scanf("%f",&c);

 d=((b*b)-(4*c*a));
 
 if(d==0)
 {
  printf("\nRoots are real and equal\n");
  r1=-b/(2*a);
  printf("\t X1=%f \n \t X2=%f ", r1, r1 );
 }

  else if(d>0)
 {
  printf("\nRoots are real and distinct\n");
  temp=sqrt(d);

  r1=(-b+temp)/(2*a);
  r2=(-b-temp)/(2*a);

  printf("\n\tX1=%f\n\tX2=%f",r1,r2);
 }

  else
 {
  printf("\nRoots are Imaginary\n");
  d*=-1;
  temp=sqrt(d);
  r1=-b/(2*a);
  r2=temp/(2*a);
  printf("\n\tX1=(%f + %fi)\n\tX2=(%f - %fi)",r1,r2,r1,r2);
 }
}

  

Output
Enter the value of a    :1
Enter the value of b    :-11
Enter the value of c    :30

Roots are real and distinct

        X1=6.000000
        X2=5.000000

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Check whether an alphabet is Vowel or not

#include <stdio.h>

void main()
 {
  char in;
  printf("Enter Character: ");
  scanf("%c", &in);
  if(in>=65&&in<=90 || in>=97&& in<=122)
  {
   if(in<97)
   in=in+32;
   if(in=='a'||in=='e'||in=='i'||in=='o'||in=='u')
   printf("vowel");
   else
         printf("consonent");
  }
  else
   printf("Not an valid Alphabet");
 }

  

Output
Enter Character: A 
vowel

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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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Find the Greatest of Three Numbers

#include<stdio.h>
void main()
{
 int x,y,z;
 printf("Enter values of x, y and z : ");
 scanf("%d,%d,%d",&x,&y,&z);
 if(x>=y && x>=z)
   printf("\n%d is greatest",x);
 else if(y>=z)
   printf("\n%d is greatest",y);
 else
   printf("\n%d is greatest",z);
}

  

Output
Enter values of x, y and z : 4, 9, 2
9 is greatest

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