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  #include <stdio.h> #include <stdlib.h> int main(void) { // This program will create same sequence of // random numbers on every program run for(int i = 0; i<5; i++) printf(" %d ", rand()); return 0; }

  #include<conio.h> #include<iostream> using namespace std; class overriding {     int age;     public:          void over(){         cout<<"Enter your age :"<<endl;         cin>>age;         cout<<"Age: "<<age;              } }; class override{       char name[20];       public:       void over(){                cout<<"Enter your name "<<endl;     cin>>name;     cout<<"Name :"<<name; }       }; int main(){     overriding obj1;     obj1.over();          override obj;     obj.over();           return 0;      }

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  // A simple recursive CPP program to print // first n Tribonacci numbers.  #include<stdio.h>  #include<conio.h>   int printTribRec(int n) { if (n == 0 || n == 1 || n == 2) return 0; if (n == 3) return 1; else return printTribRec(n - 1) + printTribRec(n - 2) + printTribRec(n - 3); } void printTrib(int n) { for (int i = 1; i < n; i++) printf("\n%d  ",printTribRec(i)); } // Driver code int main() { int n = 30; printTrib(n); return 0; }

  ** * C program to calculate total, average and percentage of five subjects */ #include <stdio.h> int main() { float eng, phy, chem, math, comp; float total, average, percentage; /* Input marks of all five subjects */ printf("Enter marks of five subjects: \n"); scanf("%f%f%f%f%f", &eng, &phy, &chem, &math, &comp); /* Calculate total, average and percentage */ total = eng + phy + chem + math + comp; average = total / 5.0; percentage = (total / 500.0) * 100; /* Print all results */ printf("Total marks = %.2f\n", total); printf("Average marks = %.2f\n", average); printf("Percentage = %.2f", percentage); return 0; }

  #include <stdio.h> int main () { int year ; year = 2016 ; if ((( year % 4 == 0 ) && ( year % 100 != 0 )) || ( year % 400 == 0 )) printf ( "%d is a leap year" , year ); else printf ( "%d is not a leap year" , year ); return 0 ; }

  #include <stdio.h> #include <math.h> main (){     int choice ;    printf ( "Enter\n1 to find area of Triangle\n2 for finding area of Square\n3 for finding area of Circle\n4 for finding area of Rectangle\n5 for Parallelogram\n" );    scanf ( "%d" ,& choice );     switch ( choice ) {       case 1 : {           int a , b , c ;           float s , area ;          printf ( "Enter sides of triangle\n" );          scanf ( "%d%d %d" ,& a ,& b ,& c );          s =( float )( a + b + c )/ 2 ;          area =( float )( sqrt ( s *( s - a )*( s - b )*( s - c )));          printf ( "Area of Triangle is %f\n" , area );           break ;       }       case 2 : { ...

  #include <stdio.h> int main (){     int number1 , number2 , i , j , flag ;    printf ( "enter the two intervals:" );    scanf ( "%d %d" ,& number1 ,& number2 );    printf ( "prime no’s present in between %d and %d:" , number1 , number2 );     for ( i = number1 + 1 ; i < number2 ; i ++){ // interval between two numbers       flag = 0 ;       for ( j = 2 ; j <= i / 2 ;++ j ){ //checking number is prime or not           if ( i % j == 0 ){             flag = 1 ;             break ;           }       }       if ( flag == 0 )          printf ( "%d\n" , i );     }     return 0 ; }

  #include<stdio.h>      int  main()     {       int  n1=0,n2=1,n3,i,number;      printf( "Enter the number of elements:" );      scanf( "%d" ,&number);      printf( "\n%d %d" ,n1,n2); //printing 0 and 1        for (i=2;i<number;++i) //loop starts from 2 because 0 and 1 are already printed       {       n3=n1+n2;       printf( " %d" ,n3);       n1=n2;       n2=n3;      }      return  0;    }    

 // C program to find factorial of given number #include <stdio.h // function to find factorial of given number unsigned int factorial(unsigned int n) { if (n == 0) return 1; return n * factorial(n - 1); } int main() { int num = 5; printf("Factorial of %d is %d", num, factorial(num)); return 0; }   or or ......................................... #include <stdio.h> // function to find factorial of given number unsigned int factorial(unsigned int n) { int res = 1, i; for (i = 2; i <= n; i++) res *= i; return res; } int main() { int num = 5; printf( "Factorial of %d is %d", num, factorial(num)); return 0; }

 // C++ program to check if a // number is prime #include <iostream> #include <math.h> using namespace std; int main() { int n, i, flag = 1; // Ask user for input cout <<"Enter a number: \n"; // Store input number in a variable cin >> n ; // Iterate from 2 to sqrt(n) for (i = 2; i <= sqrt(n); i++) { // If n is divisible by any number between // 2 and n/2, it is not prime if (n % i == 0) { flag = 0; break; } } if (n <= 1) flag = 0;  if (flag == 1) { cout << n <<" is a prime number"; } else { cout << n <<" is not a prime number"; } return 0; } // This code is contributed by shivanisinghss2110.

  #include <stdio.h> int main (){     int number , i , result = 0 ; //declare variables and initialize result to 0    printf ( "enter the number:" );    scanf ( "%d" ,& number );     for ( i = 1 ; i <= number ; i ++){       if ( number % i == 0 )          result = result + i ;     }     if ( result == 2 * number ) //checking the sum of factors==2*number       printf ( "perfect number" );     else       printf ( "not perfect number" ); }

  # include <stdio.h> void main () { int i, n; printf ( "Enter the value of n\t" ); scanf ( "%d" , &n); printf ( "Printing natural numbers from 1 to %d\n" , n); i = 1 ; do { printf ( "%d\t" , i); i++; } while (i <= n); printf ( "\n" ); }

  #include<stdio.h>      int  main()     {     int  n,r,sum=0,temp;     printf( "enter the number=" );     scanf( "%d" ,&n);     temp=n;     while (n>0)     {     r=n%10;     sum=sum+(r*r*r);     n=n/10;     }     if (temp==sum)     printf( "armstrong  number " );     else      printf( "not armstrong number" );     return  0;   }   

  #include<stdio.h>    int  main()     {     int  n,r,sum=0,temp;     printf( "enter the number=" );     scanf( "%d" ,&n);     temp=n;     while (n>0)     {     r=n%10;     sum=(sum*10)+r;     n=n/10;     }     if (temp==sum)     printf( "palindrome number " );     else      printf( "not palindrome" );    return  0;   }   

  #include<stdio.h>      int  main()     {     int  n,sum=0,m;     printf( "Enter a number:" );     scanf( "%d" ,&n);     while (n>0)     {     m=n%10;     sum=sum+m;     n=n/10;     }     printf( "Sum is=%d" ,sum);     return  0;   }   

  #include<stdio.h>      int  main()     {     int  n, reverse=0, rem;     printf( "Enter a number: " );       scanf( "%d" , &n);        while (n!=0)       {          rem=n%10;          reverse=reverse*10+rem;          n/=10;       }       printf( "Reversed Number: %d" ,reverse);     return  0;   }   

 #include <stdio.h> int main() {   char op;   double first, second;   printf("Enter an operator (+, -, *, /): ");   scanf("%c", &op);   printf("Enter two operands: ");   scanf("%lf %lf", &first, &second);   switch (op) {     case '+':       printf("%.1lf + %.1lf = %.1lf", first, second, first + second);       break;     case '-':       printf("%.1lf - %.1lf = %.1lf", first, second, first - second);       break;     case '*':       printf("%.1lf * %.1lf = %.1lf", first, second, first * second);       break;     case '/':       printf("%.1lf / %.1lf = %.1lf", first, second, first / second);       break;     // operator doesn't match any case constant     default:       printf("Error! operator is not correct");   }   return 0; }

 #include <stdio.h> struct student {     char firstName[50];     int roll;     float marks; } s[5]; int main() {     int i;     printf("Enter information of students:\n");     // storing information     for (i = 0; i < 5; ++i) {         s[i].roll = i + 1;         printf("\nFor roll number%d,\n", s[i].roll);         printf("Enter first name: ");         scanf("%s", s[i].firstName);         printf("Enter marks: ");         scanf("%f", &s[i].marks);     }     printf("Displaying Information:\n\n");     // displaying information     for (i = 0; i < 5; ++i) {         printf("\nRoll number: %d\n", i + 1);         printf("First name: ");         puts(s[i].firstName);       ...