Program to print the first 10 lines of Pascal's Triangle

#include<iostream.h>
#include<conio.h>
#include<iomanip.h>
long triangle(int x,int y);
int main()
{
clrscr();
const lines=10;
for (int i=0;i<lines;i++)
for (int j=1;j<lines-i;j++)
cout << setw(2) << " ";
for (int j=0;j<=i;j++)
cout << setw(4) << triangle(i,j);
cout << endl;
getch();
}
long triangle(int x,int y)
{
if(x<0||y<0||y>x)
return 0;
long c=1;
for (int i=1;i<=y;i++,x--)
c=c*x/i;
return c;
}

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Program to illustrate the working of new and delete operators

#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int n,i;
cout<<"Enter the number of students in the class : ";
cin>>n;
int *p=new int[n];
int *q=new int[n];
cout<<"Input the class numbers : ";
for(i=0;i<n;i++)
cin>>*(p+i);
cout<<"Input the marks : ";
for(i=0;i<n;i++)
cin>>*(q+1);
cout<<"The list of students with marks : ";
for(i=0;i<n;i++)
cout<<"\n"<<*(p+i)<<"\t"<<*(q+i);
delete [] p;
delete [] q;
getch();
}

For more details about pointers click here

Program to delete an element from an array

#include<iostream.h>
#include<conio.h>
#include<stdlib.h>
void main()
{
int s,n,i,p,a[50];
clrscr();
cout<<"Enter number of students : ";
cin>>n;
cout<<"Enter the marks : ";
for(i=0;i<n;i++)
cin>>a[i];
cout<<"Enter the marks to be deleted : ";
cin>>s;
for(i=0;i<n;i++)
if(a[i]==s)
    {
     p=i;
     break;
    }
for(i=p;i<n-1;i++)
a[i]=a[i+1];
cout<<"The new mark list is : ";
for(i=0;i<n-1;i++)
cout<<a[i];
getch();
}

Program to create a square matrix and find the sum of diagonal elements

#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int a[20][20],sum=0,m,n,i,j;
cout<<"Enter the size : ";
cin>>m>>n;
if(m==n)
{
cout<<"Enter the elements : ";
for(i=0;i<m;i++)
for(j=0;j<n;j++)
cin>>a[i][j];
for(i=0;i<m;i++)
{
for(j=0;j<m;j++)
{
if(i==j)
sum+=a[i][j];
}
}
cout<<sum;
}
else
cout<<"Not a square matrix";
getch();
}

Program to search element in an array - Linear search

#include<iostream.h>
#include<conio.h>
#include<stdio.h>
void main()
{
clrscr();
int n,p=-1;
char a[100],s;
cout<<"Enter the line of text : ";
gets(a);
cout<<"Enter the character to be searched : ";
cin>>s;
for(int i=0;a[i]!='\0';++i)
if(a[i]==s)
p=i;
if(p>=0)
cout<<"Character found in "<<p<<"th position";
else
cout<<"Character not found ";
getch();
}

Program to display all prime numbers less than 100

#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int i,j,f;
for(i=2;i<100;i++)
{
for(j=2;j<i;j++)
{
if(i%j==0)
    {
    f=1;
    break;
    }
else
    f=0;
}
if(!flag)
cout<<i;
}
getch();
}

Program to insert new element in an array

#include<iostream.h>
#include<conio.h>
void main()
{
int s,n,i,a[50],p;
clrscr();
cout<<"Enter the number of elements of array : ";
cin>>n;
cout<<"Enter the elements : ";
for(i=0;i<n;i++)
cin>>a[i];
cout<<"Enter the new element and its position : ";
cin>>s>>p;
for(i=n;i>=p;i--)
a[i]=a[i-1];
a[p]=s;
cout<<"The array after inserting new element is : ";
for(i=0;i<n+1;i++)
cout<<a[i]<<"  ";
getch();
}

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Program to reversing a string

#include<iostream.h>
#include<conio.h>
#include<string.h>
void main()
{
char name[20],rev[20];
int len,k=0;
cout<<"Enter the string  ";
cin.getline(name,20);
for(len=0;name[len]!='\0';len++)
for(i=len;i>=0;i--)
{
rev[k]=name[i];
k++;
}
rev[k]='\0';
cout<<"Reversed string  ";
cout.write(rev,20);
getch();
}

Program for multiplication of matrix using " class "

To know about 'class' click here


#include<iostream.h>
#include<conio.h>
class matrix
 {
 int a[10][10];
 int m,n;
 public:
 void input();
 void output();
 void multiply(matrix,matrix);
 };
 void matrix::input()
 {
 cout<<"Enter the number of row : ";
 cin>>m;
 cout<<"Enter the number of column : ";
 cin>>n;
 cout<<"Matrix"<<"\n";
 for(int i=0;i<m;i++)
 {
 for(int j=0;j<n;j++)
 {
 cin>>a[i][j];
 }
 }
 }
 void matrix :: output()
 {
 for(int i=0;i<m;i++)
 {
 cout<<"\n";
 for(int j=0;j<n;j++)
 {
 cout<<a[i][j]<<"\t";
 }
 }
 }
 void matrix :: multiply(matrix m1, matrix m2)
 {
 if(m1.n!=m2.m)
    {
     cout<<"matrix multiplication is not possible";
    }
 else
    {
     for(int i=0;i<m1.m;i++)
    {
     for(int j=0;j<m2.n;j++)
    {
     a[i][j]=0;
     for(int k=0;k<m1.n;k++)
     {
     a[i][j]=a[i][j] +( m1.a[i][k]*m2.a[k][j]);
     m=m1.m;
     n=m2.n;
    }
 }
 }
 }
 }
 void main()
 {
 clrscr();
 matrix m1,m2,m3;
 m1.input();
 m2.input();
 m3.multiply(m1,m2);
 m3.output();
 getch();
 }

Program to find out the sum of two matrices

#include<iostream.h>
#include<conio.h>
void main()
{
int a[10][10],b[10][10],c[10][10],i,j,m,n;
clrscr();
cout<<"Enter the number of raws and columns of two matrices : ";
cin>>m>>n;
cout<<"Enter the elements into matrix A\n";
for(i=0;i<m;i++)
for(j=0;j<n;j++)
cin>>a[i][j];
cout<<"\nEnter the elements into matrix B\n";
for(i=0;i<m;i++)
for(j=0;j<n;j++)
cin>>b[i][j];
for(i=0;i<m;i++)
for(j=0;j<n;j++)
c[i][j]=a[i][j]+b[i][j];
for(i=0;i<m;i++)
    {
    cout<<"\n";
    for(j=0;j<n;j++)
    cout<<c[i][j];
    cout<<"\t";
    }
getch();
}

Program to accept 20 numbers and display it in ascending order and descending order - Bubble sort

#include<iostream.h>
#include<conio.h>
void main()
{
int a[20],i,j,t;
clrscr();
cout<<"Enter 20 numbers : ";
for(i=0;i<20;i++)
cin>>a[i];
for(i=0;i<20;i++)
{
for(j=i+1;j<20;j++)
{
 if(a[i]>a[j])
{
    t=a[i];
    a[i]=a[j];
    a[j]=t;
}
}
}
cout<<"Ascending order : "<<"\n";
for(i=0;i<20;i++)
cout<<a[i]<<"\n";
cout<<"Descending order : "<<"\n";
for(i=19;i>=0;i--)
cout<<a[i]<<"\n";
getch();
}

Program to find the sum of all the elements of a matrix

#include<iostream.h>
#include<conio.h>
void main()
{
 clrscr();
 int a[20][20],sum=0,m,n,i,j;
 cout<<"Enter the size of matrix : "
 cin>>m>>n;
 cout<<"Enter the elements : ";
 for(i=0;i<m;i++)
 for(j=0;j<n;j++)
 {
     cin>>a[i][j];
     sum+=a[i][j];
 }
 cout<<"Sum of elements of the matrix is : "<<sum
 getch();
}

Program to access the elements in two dimensional array and display it

#include<iostream.h>
#include<conio.h>
void main()
{
 clrscr();
 int a[20][20],m,n,i,j;
 cout<<"Enter the size of matrix : "
 cin>>m>>n;
 cout<<"Enter the elements : ";
 for(i=0;i<m;i++)
 for(j=0;j<n;j++)
 cin>>a[i][j];
 cout<<"The matix is : "<<"\n";
 for(i=0;i<m;i++)
 {
 for(j=0;j<n;j++)
 {
 cout<<a[i][j]<<"\t";
 }
 }
 getch();
}

Program to generate the first n elements of a Fibonacci series

#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int a,b,i,n,c;
a=0;
b=1;
cout << "Enter the number of terms : ";
cin>>n;
cout << a <<"\t"<<b<<"\t";
for(i=2;i<n;i++)
{
    c=a+b;
    a=b;
    b=c;
    cout<<c<<"\t";

}
getch();
}

Program to count the number of lower case vowels in a string

#include<iostream.h>
#include<conio.h>
#include<stdlib.h>
#include<string.h>
#include<math.h>
#include<ctype.h>
void main()
{
 clrscr();
 char st[100];
 int l,n,i;
 cout<<"Enter the string\n";
 cin.getline(st,100);
 l=strlen(st);
 for(i=0;i<=l;i++)
 {
   if(islower(st(i))) && ((st(i)==a)||(st(i)==e)||(st(i)==i)||(st(i)==o)||(st(i)==u))
   n++;
 }
 cout<<"The number of lower case vowels is : "<<n;
 getch();
}

Program to access the marks of 3 students and display it out

#include<iostream.h>
#include<conio.h>
void main()
{
int n[3],i;
cout<<"Enter the marks\n";
for(i=0;i<3;i++)
cin>>n[i];
cout<<The given marks are\n";
for(i=0;i<3;i++)
cout<<"\n"<<n[i];
getch();
}

Program to convert Binary into Decimal number

#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
  int a[10],i,n,sum=0,j,k=0;
  clrscr();
  cout<<"Enter binary number : ";
  cin>>n;
  i=0;
  while(n>0)
  {
      a[i]=n%10;
      n=n/10;
      i++;
  }
  for(j=0;j<i;j++)
  {
      sum=sum+a[j]*pow(2,k);
       k++;
  }
  cout<<"Decimal number is : "<<sum;
  getch();
}

Program to read a string and to count the number of words

#include<iostream.h>
#include<stdio.h>
int main()
{
clrscr();
char str[80];
int i;
int wordcount=0;
puts("Enter a string upto 80 characters : ");
gets(str);
for(i=0;str[i]!='\0';i++)
{
    if(str[i]==' ')
    wordcount++;
}
cout<<"The number of words are "<<wordcount<<"\n";
return0;
}

Program using " Nested loop "

#include<iostream.h>
#include<stdio.h>
void main()
{
clrscr();
char c;
int i,j;
c='A';
for(i=1;i<=5;i++)
{
    for(j=1;j<=i;j++)
    {
        putchar(c);
    }
    putchar('\n');
    fflush(stdout);
}
}

The output of this program will be:-

A
BB
CCC
DDDD
EEEEE

Program to check whether a given number is prime or not using "for loop"

#include<iostream.h>
#include<process.h>
void main()
{
int num,i;
clrscr();
cout<<"Enter the number ";
cin>>num;
for(i=2;i<=num/2;++i)
if(num%i==0)
{
    cout<<"Not a prime number ";
    exit(0);
}
cout<<"It is prime number ";
getch();
}