71. Program to check Niven number (Harshad number).

#include<stdio.h>
#include<conio.h>
void main()
{
int n, d, a, sum = 0;
clrscr();
printf("Enter the number : ");
scanf("%d", &n);

a = n;

while (a > 0)
{
d = a % 10;
sum = sum + d;
a = a / 10;
}

if (n % sum == 0)
printf("\nThe number is Niven Number.");
else
printf("\nThe number is not a Niven Number.");
getch();
}
@programming_and_coding

72. Program to check whether the number is palindrome or not.

#include<stdio.h>
#include<conio.h>
void main()
{
int n, rev = 0, temp;
clrscr();
printf("Enter a number : ");
scanf("%d", &n);

temp = n;

while (temp != 0)
{
rev = rev * 10;
rev = rev + temp % 10;
temp = temp / 10;
}

if (n == rev)
printf("\n%d is palindrome number.", n);
else
printf("\n%d is not palindrome number.", n);
getch();
}
@programming_and_coding

73. Program to check perfect number.

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

void main()
{
int n, i = 1, sum = 0;
clrscr();
printf("Enter a number : ");
scanf("%d", &n);

/*The first perfect number is 6, because 1, 2, and 3 are its proper positive divisors, and 1 + 2 + 3 = 6.*/

while (i < n)
{
if (n % i == 0)
{
sum = sum + i;
}
i++;
}

if (sum == n)
{
printf("\n%d is a perfect number.", i);
}
else
{
printf("\n%d is not a perfect number.", i);
}
getch();
}
@programming_and_coding

74. Program to find the square root of a number.

#include<math.h>
#include<stdio.h>
#include<conio.h>
void main()
{
double num, result;
clrscr();
printf("Enter number : ");
scanf("%lf", &num);
result = sqrt(num);
printf("Square root of %lf is %lf.", num, result);
getch();
}
@programming_and_coding

75. Program to print sum of 'n' prime numbers.

#include<stdio.h>
#include<conio.h>
void main()
{
int n, i = 3, count, c, sum = 2;
clrscr();
printf("Enter total number of prime numbers for addition : ");
scanf("%d", &n);

if (n >= 1)
{
printf("\nFirst %d prime numbers are :", n);
printf("\n2 ");
}
for (count = 2; count <= n;)
{
for (c = 2; c <= i - 1; c++)
{
if (i % c == 0)
break;
}
if (c == i)
{
sum = sum + i;
printf("%d ", i);
count++;
}
i++;
}
printf("\nSum : %d", sum);
getch();
}
@programming_and_coding

76. Program to print sum of factorial series 1/1! + 2/2! +...1/N!

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

double sumseries(double);

void main()
{
double number, sum;
clrscr();

printf("Enter the number : ");
scanf("%lf", &number);
sum = sumseries(number);

printf("\nSum of the above series = %lf ", sum);

getch();
}

double sumseries(double m)
{
double sum2 = 0, f = 1, i;
for (i = 1; i <= m; i++)
{
f = f * i;
sum2 = sum2 + (i / f);

if (i == m)
{
printf("%.2lf / %.2lf = %lf", i, f, sum2);
}
else
{
printf("%.2lf / %.2lf + \n", i, f);
}
}
return(sum2);
}
@programming_and_coding

77. Program to calculate the sum of 'n' terms in Taylor series.

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

void main()
{
int x, i;
int fact = 1, n;
float sum = 0;
clrscr();
printf("Enter the value of x : ");
scanf("%d", &x);
printf("Enter the number of terms : ");
scanf("%d", &n);

for (i = 1; i < n; i++)
{
fact = fact * i;
sum = sum + (pow(x, i) / fact);
}
sum = sum + 1;
printf("The sum of taylor series is : ");
printf("%f", sum);
getch();
}
@programming_and_coding

78. Program to swap two numbers without using third variable.

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

void main()
{
int x = 10, y = 5;
clrscr();
printf("Enter x : ");
scanf("%d", &x);
printf("Enter y : ");
scanf("%d", &y);

printf("\nBefore Swapping : \n x = %d \n y = %d", x, y);

// Code to swap x and y
x = x + y;
y = x - y;
x = x - y;

printf("\nAfter Swapping : \n x = %d \n y = %d", x, y);
getch();
}
@programming_and_coding

79. Program to swap two numbers using bitwise XOR.

#include<stdio.h>
#include<conio.h>
void main()
{
long i, k;
clrscr();
printf("Enter two integers : \n");
scanf("%ld %ld", &i, &k);

printf("\n Before swapping i : %ld and k : %ld", i, k);
i = i ^ k;
k = i ^ k;
i = i ^ k;
printf("\nAfter swapping i : %ld and k : %ld", i, k);
getch();
}
@programming_and_coding

80. Program to swap two numbers using pointer.

#include<stdio.h>
#include<conio.h>
void main()
{
int a, b;
int *ptra, *ptrb, *temp;
clrscr();
printf("Enter a : ");
scanf("%d", &a);
printf("Enter b : ");
scanf("%d", &b);

printf("\nBefore swapping : a : %d, b : %d", a, b);

ptra = &a;
ptrb = &b;

temp = ptra;
*ptra = *ptrb;
*ptrb = *temp;

printf("\nAfter swapping : a : %d, b : %d", a, b);
getch();
}
@programming_and_coding

81. Program to add two numbers using pointer.

#include<stdio.h>
#include<conio.h>
void main()
{
int first, second, *p, *q, sum;
clrscr();
printf("Enter two integers : \n");
scanf("%d %d", &first, &second);

p = &first;
q = &second;

sum = *p + *q;

printf("\nSum of entered numbers : %d", sum);
getch();
}
@programming_and_coding

82. Program to add first and last digit of a number.

#include<stdio.h>
#include<conio.h>
void main()
{
int input, firstNum, lastNum;
clrscr();

printf("Enter number : ");
scanf("%d", &input);

lastNum = input % 10;
firstNum = input;

while (firstNum >= 10)
firstNum /= 10;

printf("\nAddition of first and last number : %d + %d = %d",
firstNum, lastNum, firstNum + lastNum);
getch();
}
@programming_and_coding

83. Program to find area of triangle using Heron's formula.

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

void main()
{
double a, b, c, s, area;
clrscr();
printf("\nEnter the sides of triangle : \n");
scanf("%lf%lf%lf", &a, &b, &c);

s = (a + b + c) / 2;
area = sqrt(s * (s - a) * (s - b) * (s - c));

printf("\nArea of triangle using Heron's Formula : %.2lf", area);
getch();
}
@programming_and_coding

84. Program to convert Binary to Decimal.

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

int binary_decimal(int n);

void main()
{
int n;
char c;
clrscr();
printf("Enter Binary number : ");
scanf("%d", &n);
printf("%d in binary = %d in decimal", n, binary_decimal(n));
getch();
}

//Function to convert binary to decimal.

int binary_decimal(int n)
{
int decimal = 0, i = 0, rem;
while (n != 0)
{
rem = n % 10;
n /= 10;
decimal += rem * pow(2, i);
++i;
}
return decimal;
}
@programming_and_coding

85. Program to convert Decimal numbers to Binary.

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

void main()
{
int n, c, k;
clrscr();
printf("Enter a decimal number : ");
scanf("%d", &n);

printf("\n%d in binary number system is : ", n);

for (c = 31; c >= 0; c--)
{
k = n >> c;
if (k & 1)
{
printf("1");
}
else
{
printf("0");
}
}

printf("\n");
getch();
}
@programming_and_coding

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86. Program to find f(x) by Lagrange's interpolation method.

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

void main()
{
float x[10], y[10], temp = 1, f[10], sum, p;
int i, n, j, k = 0, c;
clrscr();

printf("How many record you will enter : ");
scanf("%d", &n);
for (i = 0; i < n; i++)
{
printf("\n\nenter the value of x%d: ", i);
scanf("%f", &x[i]);

printf("\n\nEnter the value of f(x%d): ", i);
scanf("%f", &y[i]);
}

printf("\n\nEnter X for finding f(x): ");
scanf("%f", &p);

for (i = 0; i < n; i++)
{
temp = 1;
k = i;
for (j = 0; j < n; j++)
{
if (k == j)
{
continue;
}
else
{
temp = temp * ((p - x[j]) / (x[k] - x[j]));
}
}
f[i] = y[i] * temp;
}

for (i = 0; i < n; i++)
{
sum = sum + f[i];
}

printf("\n\nf(%.1f) = %f ", p, sum);
getch();
}
@programming_and_coding

87. Program to check the leap year.

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

void main()
{
int year;
clrscr();
printf("Enter a year : ");
scanf("%d", &year);

if (year % 400 == 0)
printf("\n%d is a leap year.", year);
else if (year % 100 == 0)
printf("\n%d is not a leap year.", year);
else if (year % 4 == 0)
printf("\n%d is a leap year.", year);
else
printf("%d is not a leap year.", year);
getch();
}
@programming_and_coding

88. Program to find nCr & nPr.

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

long factorial(int);

long find_ncr(int, int);

long find_npr(int, int);

void main()
{
int n, r;
long ncr, npr;
clrscr();

printf("Enter the value of n and r : \n");
scanf("%d %d", &n, &r);

ncr = find_ncr(n, r);
npr = find_npr(n, r);

printf("%dC%d = %ld\n", n, r, ncr);
printf("%dP%d = %ld\n", n, r, npr);
getch();
}

long find_ncr(int n, int r)
{

long result;

result = factorial(n) / (factorial(r) * factorial(n - r));

return result;
}

long find_npr(int n, int r)
{

long result;

result = factorial(n) / factorial(n - r);

return result;
}

long factorial(int n)
{

int c;
long result = 1;

for (c = 1; c <= n; c++)
result = result * c;

return (result);
}
@programming_and_coding

89. Program for Newton Raphson General.

#include<stdio.h>
#include<math.h>

int user_power, i = 0, cnt = 0, flag = 0;
int coef[10] = {0};
float x1 = 0, x2 = 0, t = 0;
float fx1 = 0, fdx1 = 0;

int main()
{
printf("PROGRAM FOR NEWTON RAPHSON GENERAL");

printf("\nEnter the total no. of power : ");
scanf("%d", &user_power);

for (i = 0; i <= user_power; i++)
{
printf("\nx^%d : ", i);
scanf("%d", &coef[i]);
}

printf("\n");

printf("\n\nThe Polynomial is ");

//printing coeff.
for (i = user_power; i >= 0; i--)
{
printf("%dx^%d", coef[i], i);
}

printf("\n\nIntial x1 -> ");
scanf("%f", &x1);

printf("Iteration\tX1\tFX1\tF'X1");

do
{
cnt++;
fx1 = fdx1 = 0;
for (i = user_power; i >= 1; i--)
{
fx1 += coef[i] * (pow(x1, i));
}

fx1 += coef[0];

for (i = user_power; i >= 0; i--)
{
fdx1 += coef[i] * (i * pow(x1, (i - 1)));
}

t = x2;
x2 = (x1 - (fx1 / fdx1));
x1 = x2;

printf("\n\t%d\t%.3f\t%.3f\t%.3f ", cnt, x2, fx1, fdx1);

}
while ((fabs(t - x1)) >= 0.0001);

printf("\n\nThe root of equation is %f", x2);

return 0;
}
@programming_and_coding