Write a program to solve a quadratic equation.

Output

#include <iostream>
#include <math.h>
using namespace std;
int main()
{
int a,b,c,d=0,x;
cout<<"Enter a,b & c:";
cin>>a>>b>>c;
d=(b*b)-4*a*c;
cout<<"Result:\n";
if(d<0) {
cout<<"d<0"<<endl;
cout<<(-b-sqrt(d))/2*a<<endl;
cout<<(-b+sqrt(d))/2*a<<endl;
} else if(d==0) {
cout<<"D=0"<<endl;
cout<<-b/2*a<<endl;;
} else {
cout<<"D>0"<<endl;
cout<<"Imaginary number: "<<endl;
}
}

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Write a program to find first n prime numbers.

Output

#include <iostream.h>

using namespace std;
int main()
{
   int n, i = 3, count, c;
   cout<<"Enter the number of prime numbers required: ";
   cin>>n;
   if ( n >= 1 ) {
      cout<<"First "<<n<<" prime numbers are:\n";
      cout<<"2\n";
   }
   count = 2 ;
   while (count <= n) {
      for ( c = 2 ; c <= i - 1 ; c++ ) {
         if ( i%c == 0 )
            break;
      }
      if ( c == i ) {
         cout<<i<<"\n";
         count++;
      }
      i++;
   }
   return 0;
}

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Write a program to calculate sum of the elements of an 2D array.

#include<iostream>
using namespace std;
int main()
{
int a[100][100];
int r,c;
cout<<"Enter no. of rows & columns: ";
cin>>r>>c;;
cout<<"Enter "<<r*c<<" values : ";
for(int i=0;i<r;i++) {
for(int j=0;j<c;j++) {
cin>>a[i][j];
}
}
for(int i=0;i<r;i++) {
for(int j=0;j<c;j++) {
a[i][c]+=a[i][j];
}

}
for(int i=0;i<r;i++) {
for(int j=0;j<c+1;j++) {
a[r][j]+=a[i][j];
}

}
cout<<"SUM : "<<"\n";
for(int i=0;i<r+1;i++) {
for(int j=0;j<c+1;j++) {
cout<<a[i][j]<<" ";
}
cout<<"\n";
}
}

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