C Programming :

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/*Write a program in C to print 'Hello, World!'*/

#include<stdio.h>
int main ()
{
  printf ("\nHello, World!");
  return 0;
}

/*WAP in C to perfrom addition of two integers*/

#include<stdio.h>
int main ()
{
  int a, b, s;
  printf ("\nEnter the first integer: ");
  scanf ("%d", &a);
  printf ("\nEnter the second integer: ");
  scanf ("%d", &b);
  s = a + b;
  printf ("\nThe result of %d + %d = %d",a,b,s);
  return 0;
}

/*WAP in C to check a (whole) number is even or odd*/

#include<stdio.h>
int main ()
{
  int n;
  printf ("\nEnter the number: ");
  scanf ("%d", &n);
  if (n%2==0)
    printf("\n%d is an even number", n);
  else
    printf("\n%d is a odd number", n);
  return 0;
}

/*Write a program in C to find the maximum of three integers*/
//Using a fourth variable => Preffered

#include<stdio.h>
int main ()
{
  int a, b, c, max=0;
  printf ("\nEnter the three numbers: ");
  scanf ("%d %d %d", &a, &b, &c); 
  if (a>max)  
    max=a; //stores the highest value in max
  if (b>max) //do not use else if, reason: next comment
    max=b; 
  if (c>max) //else if => wouldn't check further cond. if satisfied
    max=c;	
  printf("\n%d is the largest number", max);
  return 0;
}

/*Write a program  in C to find the maximum of three integers*/
//Without using a fourth variable => Not preffered

#include<stdio.h>
int main ()
{
  int a, b, c;
  printf ("\nEnter the first number: ");
  scanf ("%d", &a);
  printf ("\nEnter the second number: ");
  scanf ("%d", &b);
  printf ("\nEnter the third number: ");
  scanf ("%d", &c);
  if (a>b)
  {   
    if (a>c)
      printf("\n%d is the largest number", a);
    else
      printf("\n%d is the largest number", c);
  }
  else
  {   
    if (b>c)
      printf("\n%d is the largest number", b);
    else
      printf("\n%d is the largest number", c);
  }
  return 0;
}

/*Write a program in C to print from 1 to n*/
//Using a while (condition) loop

#include<stdio.h>
int main ()
{
  int n, i=1;
  printf ("\nEnter the limit: ");
  scanf ("%d", &n); 
  while (i <= n)
  {
    printf("\n%d", i);
    i++; //incrementing value of i by 1
  }	
  return 0;
}

/*Write a program in C to print grade of students*/
//Switch case => grading, if/else => validations, round() => round off

#include<stdio.h>
#include<math.h>
int main ()
{
  int result;
  float m1, m2, m3, resultFloat;
  printf ("\nEnter the marks of three subjects: ");
  scanf ("%f%f%f", &m1, &m2, &m3); 
  if ((m1>100 || m2>100 ||m3>100) || (m1<0 || m2<0 || m3<0)) //validates inputs
    printf ("\nEneter valid marks of each subject (out of 100)");
  else {
    resultFloat = (m1+m2+m3)/3;
    printf("\nThe average of marks entered is %f",resultFloat);
    result = round((m1+m2+m3)/3);
    printf("\nRounding off avg. marks...\nNew avg. marks: %d",result);
    
    switch (result)
    {
      case 91 ... 100:
        printf ("\nGrade 'O'");
        break;
      case 81 ... 90:
        printf ("\nGrade 'E'");
        break;
      case 71 ... 80:
        printf ("\nGrade 'A'");
        break;
      case 61 ... 70:
        printf ("\nGrade 'B'");
        break;
      case 51 ... 60:
        printf ("\nGrade 'C'");
        break;
      case 40 ... 50:
        printf ("\nGrade 'D'");
        break;
      case 0 ... 39:
        printf ("\nGrade 'F' (Fail)");
        break;
      default:
        printf ("\nAn error occured while caculation");
    }
  }		
  return 0;
}

/*Write a program in C to print grade of students*/
//if/else if => grading, if/else => validations, round() => round off

#include<stdio.h>
#include<math.h>
int main ()
{
  int result;
  float m1, m2, m3, resultFloat;
  printf ("\nEnter the marks of three subjects: ");
  scanf ("%f%f%f", &m1, &m2, &m3); 
  if ((m1>100 || m2>100 ||m3>100) || (m1<0 || m2<0 || m3<0)) //validates inputs
    printf ("\nEneter valid marks of each subject (out of 100)");
  else {
    resultFloat = (m1+m2+m3)/3;
    printf("\nThe average of marks entered is %f",resultFloat);
    result = round((m1+m2+m3)/3);
    printf("\nRounding off avg. marks...\nNew avg. marks: %d",result);
    if (result >= 91 && result <=100)
      printf ("\nGrade 'O'");
    else if (result >= 81 && result <=90)
      printf ("\nGrade 'E'");
    else if (result >= 71 && result <=80)
      printf ("\nGrade 'A'");
    else if (result >= 61 && result <=70)
      printf ("\nGrade 'B'");
    else if (result >= 51 && result <=60)
      printf ("\nGrade 'C'");
    else if (result >= 40 && result <=50)
      printf ("\nGrade 'D'");
    else if (result >= 0 && result <40)
      printf ("\nGrade 'F' (Fail)");
    else
      printf ("\nAn error occured while caculation");	
    }
  return 0;
}

/*WAP in C to check a number is palindrome(madam) or not*/
//125 != 521 => not palindrome, 121=121 => palindrome

#include<stdio.h>
int main ()
{
  int n, m, r, d=0;
  printf ("\nEnter the number: ");
  scanf ("%d", &n); 
  m = n; //duplicating the value of n in m
  while (n!=0)
  {
//these operations inter-change(swap) the positions e.g. 125 as 521.
    r = n % 10;
    d = d * 10 + r;
    n = n / 10;
  }
  if (m == d)
    printf ("\nAs %d = %d. Therefore %d is a palindrome no.", m ,d, m);
  else
    printf ("As %d != %d. Therefore %d is not palindrom no.", m ,d, m);
  return 0;
}

/*WAP in C to calculate the factorial of a number*/

#include<stdio.h>
int main ()
{
  int n, i, f=1;
  printf ("\nEnter the number to its calculate factorial: ");
  scanf ("%d", &n); 
  for (i=1; i<=n; i++) //increments loop by i++ i.e. i=i+1
  {
    f = f * i;
  }
  printf ("\nFactorial of %d is %d", n, f);
  return 0;
}

/*WAP in C to print the sum of folwoing series*/
//Calculate Sum of Series: 1+2+3+4+5+....n = sum

#include<stdio.h>
int main ()
{
  int n, i, sum=0;
  printf ("\nEnter the limit of the series to calculate its sum: ");
  scanf ("%d", &n); 
  for (i=1; i<=n; i++) //increment done after updating sum
  {
    sum = sum +i;
  }
  printf ("\nSum of the series: %d", sum);
  return 0;
}

/*WAP in C to print the following series and its sum*/
//Print Series & Sum: '1+2+3+4+5+....n = sum'

#include<stdio.h>
int main ()
{
  int n, i, sum=0;
  printf ("\nEnter the limit of the series: ");
  scanf ("%d", &n); 
  for (i=1; i<=n; i++) //for calculating sum;
  {
    sum = sum +i;
  }
  for (i=1; i<n; i++) // for printing '1+2+3+_ _ _ _(n-1) +'
  {
    printf ("%d + ", i);
  }
  printf ("%d = %d", n, sum); // for printing 'n = sum'
  return 0;
}

/*WAP in C to print the following series and its sum*/
//Print Series & Sum: '1+3+5+7+....n = sum'

#include<stdio.h>
int main ()
{
  int n, i, sum=0;
  printf ("\nEnter the limit of the series: ");
  scanf ("%d", &n); 
  for (i=1; i<n; i+=2) //for calculating sum till last second digit
  {
    sum = sum +i; // sum = '1+3+5+7+_ _ _ _+ last second digit'
  }
  sum = sum + n; //now sum = '1+3+5+7+_ _ _ _last second digit + n'
  for (i=1; i<n; i+=2) //printing '+1+3+5+7+_ _ _ _last second digit +'
  {
    printf ("%d + ", i);
  }
  printf ("%d = %d", n, sum); //printing 'n = sum', n is last digit
  return 0;
}

/*WAP in C to print the following series and its sum*/
//Print Series & Sum: '1+2+4+7+11+....n = sum'

#include<stdio.h>
int main ()
{
  int n, i, k=0, sum=0;
  printf ("\nEnter the limit of the series: ");
  scanf ("%d", &n); 
  for (i=1; i<n; i+=k) //calculates sum till last second digit
  {
    sum = sum +i; //sum = '1+2+4+7+11+_ _ _ _+ last second digit'
    k++;
  }
  sum = sum + n; //now sum = '1+2+4+7+11+_ _ _ _+ last second digit + n'
  k = 0; //resets value of k to 0 to again use in upcoming for loop
  for (i=1; i<n; i+=k) //printing '+1+3+5+7+_ _ _ _last second digit +'
  {
    printf ("%d + ", i);
    k++;
  }
  printf ("%d = %d", n, sum); //prints 'n = sum', n is last digit
  return 0;
}

/*Write a program in C to print the following pattern:
1
2  3
4  5  6
7  8  9  10
*/

#include<stdio.h>
int main ()
{
  int n, i, j, k;
  printf ("\nEnter the total number of lines: ");
  scanf ("%d", &n);
  k = 1;
  for (i=1; i<=n; i++) //outer loop i => maintains line no.
  {
    printf ("\n");
    for (j=1; j<=i; j++) //nested loop j => nos. in each line
    {
      printf ("%d ",k);
      k++;
    }
  }
  return 0;
}

/*Write a program in C to print the following pattern:
1
2  3
3  4  5 
4  5  6  7
5  6  7  8  9
*/

#include<stdio.h>
int main ()
{
  int n, i, j, k;
  printf ("\nEnter the total number of lines: ");
  scanf ("%d", &n);
  for (i=1; i<=n; i++) //outer loop i => maintains line no.
  {
    k = i; /*starts line with value = current line no.,
                starting of line (k) = line no. (i)*/
    printf ("\n");
    for (j=1; j<=i; j++) //nested loop j => nos. in each line
    {
      printf (" %d ",k); //placed 1 bar space after each no.
      k++;
    }
  }
  return 0;
}

/*Write a program in C to print the following pattern:
1
1  2
1  2  3
1  2  3  4
1  2  3  4  5
*/

#include<stdio.h>
int main ()
{
  int n, i, j;
  printf ("\nEnter the total number of lines: ");
  scanf ("%d", &n);
  for (i=1; i<=n; i++) //outer loop i => maintains line no.
  {
    printf ("\n");
    for (j=1; j<=i; j++) //inner loop j => nos. in each line
    {
      printf (" %d ",j); //1 bar space
    }
  }
  return 0;
}

/*Write a program in C to print the following pattern:
            1
          1  2
      1  2  3
    1  2  3  4
1  2  3  4  5
*/

#include<stdio.h>
int main ()
{
int n, i, j, k;
printf ("\nEnter the total number of lines: ");
scanf ("%d", &n);
for (i=1; i<=n; i++) //outer for loop i => maintains line no.
{
printf ("\n");
for (j=1; j<=n-i; j++) //inner for loop j => nos. in each line
{
  printf ("  "); //placed 2 bar space after each no.
}
for (k=1; k<=i; k++)
printf ("%d ", k);//
}
return 0;
}

  /*Write a program in C to print the following pattern:
            1
          1  2  1
      1  2  3  2  1
    1  2  3  4  3  2  1
1  2  3  4  5  4  3  2  1
*/

#include<stdio.h>
int main ()
{
int n, i, j, k, l;
printf ("\nEnter the total number of lines: ");
scanf ("%d", &n);
for (i=1; i<=n; i++) //outer loop i => maintains line no.
{
printf ("\n");
for (j=1; j<=n-i; j++) //inner loop j => nos. in each line
{
printf ("  "); //placed 2 bar space after each no.
}
for (k=1; k<=i; k++)
printf ("%d ", k);
/*Till here left side of the pattern will be printed*/
for (l=i-1; l>=1;l--) //prints the right half of the pattern
printf ("%d ", l); 
}
return 0;
}

/*WAP in C to raise one number to the power of another*/

#include<stdio.h>
#include<math.h>
int main ()
{
  int b, p ,r;
  printf ("\nEnter the base value: ");
  scanf ("%d", &b);
  printf ("\nEnter the power value: ");
  scanf ("%d", &p);
  r = pow (b, p); //must include math.h header file
  printf("\nThe result of %d ^ %d = %d", b, p, r);
  return 0;
}

/*WAP in C to print the following series and its sum*/
//Series: 1+2^2+3^3+4^4+5^5+_ _ _ _n^n = sum

#include<stdio.h>
#include<math.h>
int main ()
{
  int n, i;
  unsigned long long int sum = 0; //larger data type than int
  printf ("\nEnter the limit or last digit (only base) of series: ");
  scanf ("%d", &n);
  for (i=1; i<=n; i++)
  {
    sum = sum + (unsigned long long int) pow(i, i);
  }
  printf ("\n1");
  for (i=2; i<=n; i++) //for continuing series after '1 + 2'
  {
    printf (" + %d ^ %d", i, i);
  }
  printf(" = %llu", sum);
  return 0;
}

/*Write a program in C to print the following series's sum*/
//Series: 1+2^2+3^3+4^4+5^5+_ _ _ _n^n = sum

#include<stdio.h>
#include<math.h>
int main ()
{
  int n, i;
  unsigned long long int sum = 0; //larger data type than int
  printf ("\nEnter the limit or last digit (only base) of series: ");
  scanf ("%d", &n);
  for (i=1; i<=n; i++)
  {
    sum = sum + (unsigned long long int) pow(i, i);
  }
  printf("\nThe sum of the series = %llu", sum);
  return 0;
}

/*WAP in C to print the following series and its sum*/
//Series: 1+2+3^2+4^3+5^4+_ _ _ _n^n-1 = sum

#include<stdio.h>
#include<math.h>
int main ()
{
  int n, i;
  unsigned long long int sum = 0; // use a larger data type than int
  printf ("\nEnter the limit or last digit (only base) of series: ");
  scanf ("%d", &n);
  for (i=1; i<=n; i++)
  {
    sum = sum + (unsigned long long int) pow(i, i-1); 
  }
  printf ("\n1 + 2");
  for (i=3; i<=n; i++) //for continuing series after '1 + 2'
  {
    printf (" + %d ^ %d", i, i-1);
  }
  printf(" = %llu", sum);
  return 0;
}

/*Write a program in C to check a number is prime or not*/
//Used tenary conditional operator in C for if else

#include<stdio.h>
int main ()
{
  int n, i, q=0; //q is used as a flag
  printf ("\nEnter the number: ");
  scanf ("%d", &n);
  for (i=2; i<n; i++)
  if (n%i==0) //prime no. is !divisble by any other than 1 and itself
  {
    q = 1;
    break; //once condition true, break will act to come oyt of loop
  }
  q == 0 ? printf ("\n%d is prime number", n) :
    printf ("\n%d not a is prime number", n);
    /*syntax for tenary: condition ? if (if condition true) :
        else (if condition is false)*/
  return 0;
}

/*Write a program in C to print the following series's sum*/
// Series: 1+(2/1!)+(3/2!)+(4/3!)+_ _ _ _(n/n-1!)=sum

#include<stdio.h>
int main ()
{
	int n, i, j, fact;
	float term, sum=1.0;
	printf ("\nEnter the limit or last digit (only numberator's') of series: ");
	scanf ("%d", &n);
	for (i=2; i<=n; i++)
	{
		fact = 1; //intialising fact here gives correct output
		for (j=1; j<i; j++)
		{
			fact = fact * j;
		}
		term = (float) i / fact; //if we put (i / fact) it gives wrong output
		sum = sum + term;
	}
	printf ("The sum of the series: %f", sum);
	return 0;
}

/*WAP in C to add two integers using a user defined function*/

#include<stdio.h>
int Add(int, int); //prtotype declration
int main ()
{
  int a, b, c; //q is used as a flag
  printf ("\nEnter two numbers to add: ");
  scanf ("%d %d", &a, &b);
  c = Add(a, b); //function calling
  printf ("\nThe result of %d + %d = %d", a, b, c);
  return 0;
}
int Add(int x, int y) //function with parameters, a => x, b => y
{
  int z;
  z = x + y;
  return printf ("\nUsing Add() function"), z;
}