Count no. of students above,below and average students

  #include<stdio.h>
  #include<conio.h>
   void main()
    {
     int a[10];
     int aa=0,ba=0,ae=0,i;
     clrscr();
     printf("Enter the marks:\n");
     for(i=0;i<10;i++)
       {
scanf("%d",&a[i]);
if(a[i]>55)
aa++;
else if(a[i]<55)
ba++;
else
ae++;
       }
     printf("No. OF AVG STUDENTS ARE:%d\n",ae);
     printf("No. OF ABOVE AVERAGE STUDENTS:%d\n",aa);
     printf("No. OF BELOW AVERAGE STUDENTS ARE:%d",ba);
    getch();
   }

Print Armstrong numbers Less Than 1000

  #include<stdio.h>
  #include<conio.h>
  void main()
   {
    int q,a,b,c,z,x,n=1;
    clrscr();
    printf("  OUTPUT :");
    while(n<1000)
{
a=n%10;
q=n/10;
b=q%10;
c=q/10;
z=((c*100)+(b*10)+a);
x=(a*a*a)+(b*b*b)+(c*c*c);
if(x==z)
printf("\n\t%d",n);
n++;
}
    getch();
   }

Add Pointers

#include<stdio.h>
#include<conio.h>
 void main()
 {
 int a[10],sum=0;
 int *j;
 int i,n;
 clrscr();
 printf("Enter how many elements u want to add:");
 scanf("%d",&n);
 printf("Enter the elements:");
 for(i=0;i<n;i++)
 {
 scanf("%d",&a[i]);
 }
  j=&a[0];
 for(i=0;i<n;i++)
     {


       sum=sum+*j;
       j++;
     }
 printf("sum=%d",sum);
}

Add two matrices and store the result

#include<stdio.h>
#include<conio.h>
void main()
{
int a[3][3],b[3][3],c[3][3],i,j;
clrscr();
printf("Enter the elements into matrix A\n");
for(i=0;i<3;i++)
for(j=0;j<3;j++)
scanf("%d",&a[i][j]);
printf("\nEnter the elements into matrix B\n");
for(i=0;i<3;i++)
for(j=0;j<3;j++)
scanf("%d",&b[i][j]);
for(i=0;i<3;i++)
for(j=0;j<3;j++)
c[i][j]=a[i][j]+b[i][j];
for(i=0;i<3;i++)
{
printf("\t\t");
for(j=0;j<3;j++)
printf("%d\t",c[i][j]);
printf("\n\a");
}


getch();
}

Find address of char, string, integer

#include<stdio.h>
#include<conio.h>
 main()
  {
   char *chp,*sp;
   int i;
   char ch,s[10];
   int *ip;
   clrscr();
   printf("Enter a char:");
   scanf("%c",ch);
   printf("Enter a string:");
   scanf("%s",s);
   printf("Enter a integer:");
   scanf("%d",&i);
   chp=&ch;
   sp=s;
   ip=&i;
   printf("\nchar\tadd\tstring\t\tstringadd\tint\tint add\n");
   printf("%c\t%u\t%s\t\t%u\t\t%d\t%u",ch,&chp,s,&s,i,&i);
   printf("\nchar pointer value is:%u",chp);
   printf("\nstring pointer value is:%u",sp);
   printf("\nint pointer value is:%u",ip);
   getch();
  }

Print Second Largest Among Given Three No.S

#include<stdio.h>
  #include<conio.h>
  void main()
   {
    int a,b,c;
    clrscr();
    printf("   OUTPUT :\n");
    printf("Enter any three no.s:");
    scanf("%d%d%d",&a,&b,&c);
    if(a>b&&a>c)


if(b>c)
printf("%d is the second largest no.",b);
else
printf("%d is the second largest no.",c);


    if(b>a&&b>c)


if(a>c)
printf("the second largest no. is % d",a);
else
printf(" the second largest no. is %d",c);


    if(c>a&&c>b)


if(b>a)
printf("second largest no. is %d",b);
else
printf("second largest no. is %d",a);


    getch();
   }

Print all permutations of a given string

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

/* Function to swap values at two pointers */
void swap (char *x, char *y)
{
    char temp;
    temp = *x;
    *x = *y;
    *y = temp;
}

/* Function to print permutations of string
   This function takes three parameters:
   1. String
   2. Starting index of the string
   3. Ending index of the string. */
void permute(char *a, int i, int n)
{
   int j;
   if (i == n)
     printf("%s\n", a);
   else
   {
        for (j = i; j <= n; j++)
       {
          swap((a+i), (a+j));
          permute(a, i+1, n);
          swap((a+i), (a+j)); //backtrack
       }
   }
}

/* Driver program to test above functions */
int main()
{
   char a[] = "ABC";
   permute(a, 0, 2);
   getchar();
   return 0;
}