Examples of C Programming Language

C Programs

1. Hello World

#include<stdio.h>

//tells compiler to include std input output header file

int main()

{

  printf("Hello World");

 

  return 0;

}

2. Print Integer

#include<stdio.h>

int main()

{

  int a;

  printf("Enter an integer\n");

  scanf("%d",&a);

  printf("Integer that you have entered is %d\n",a);

  return 0;

}

3. Addition of two number

#include<stdio.h>

int main()

{

  int a,b,sum;

  printf("Enter two integers to add\n");

  scanf("%d%d",&a,&b);

  sum = a+b;

  printf("Sum of two number is = %d\n",sum);

  return 0;

}

4. Area of triangle

#include<stdio.h>

int main()                                            

{

  int height,base;

  float ans;

  printf("Enter the height and base of triangle");

  scanf("%d%d",&height,&base);

  ans = (1/2)*height*base;

  printf("Area of triangle is %f",ans);

}

5. Odd or Even

#include<stdio.h>

int main()

{

  int n;

  printf("Enter the integer\n");

  scanf("%d",&n);

  if(n%2==0)

  printf("Even");

  else

  printf("Odd\n");

  return 0;

}

6.  Add subtract multiply divide

#include<stdio.h>

int main()

{

  int a,b,add,sub,mult;

  float div;

  printf("Enter two integers\n");

  scanf("%d%d",&a,&b);

 

  add = a+b;

  sub =a-b;

  mult =a*b;

  div =a/b;

 

  printf("sum is %d",add);

  printf("difference is %d",sub);

  printf("multiplication is %d",mult);

  printf("Division is = %2f\n ",div);

  return 0;

}

7.  Add n Number

#include<stdio.h>

int main()

{

  int n,sum=0,c,value;

  printf("Enter the number of integers you want to add\n");

  scanf("%d",&n);

 

  printf("Enter %d integers \n",n);

 

  for(c =1;c<=n;c++)

  {

   scanf("%d",&value);

   sum = sum+value;

  }

  printf("Sum of entered integers = %d\n",sum);

  return 0;

}

8.  Add digits

#include<stdio.h>

int main()

{

  int n,sum = 0,remainder;

  printf("Enter an intger\n");

  sacnf("%d",&n);

 

  while(n!=0)

  {

   remainder = n%10;

   sum = sum+remainder;

   n =n\10;

  }

  printf("Sum of digits of entered number = %d\n",sum);

  return 0;

}

9.  calculate percentage

#include < stdio.h >

void main()

{

int s1, s2, s3, s4, s5, sum, total = 500;

float per;

printf("\nEnter marks of 5 subjects : ");

scanf("%d %d %d %d %d", &s1, &s2, &s3, &s4, &s5);

sum = s1 + s2 + s3 + s4 + s5;

printf("\nSum : %d", sum);

per = (sum * 100)/500;

/* percentage formula*/

printf("\nPercentage : %f", per);

}

10.  Calculate Gross salary

#include < stdio.h >

void main()

{

int gross_salary, basic, da, ta;

printf("Enter basic salary : ");

scanf("%d", &basic);

da = (10 * basic)/100;

ta = (12 * basic)/100;

gross_salary = basic + da + ta;

printf("\nGross salary : %d",gross_salary);

}

11.  Simple interest

#include < stdio.h >

void main()

{

int amount, rate, time, ans;

printf("\nEnter Principal Amount : ");

scanf("%d", &amount);

printf("\nEnter Rate of Interest : ");

scanf("%d", &rate);

printf("\nEnter Period of Time : ");

scanf("%d", &time);

ans = (amount * rate * time)/100;

/Simple interest formula/

printf("\nSimple Interest : %d",ans);

}

12.   Area of Circle

#include < stdio.h >

#include < math.h >

#define PI 3.142

void main()

{

float radius, area;

printf("Enter the radius of a circle \n");

scanf("%f", &radius);

area = PI * pow(radius, 2);

printf("Area of a circle = %5.2f\n", area);

}

13.  Area of Rectangle

#include < stdio.h >

#include < conio.h >

int main()

{

      int length,              breadth, area;

printf("\nEnter the Length of Rectangle : ");

scanf("%d", &length);

printf("\nEnter the Breadth of Rectangle : ");

scanf("%d", &breadth);

area = length * breadth;

printf("\nArea of Rectangle : %d", area);

return (0);

}

14.   Area of Square

#include < stdio.h >

int main()

{   

 int side, area;

printf("\nEnter the Length of Side : ");

scanf("%d", &side);

area = side * side;

printf("\nArea of Square : %d", area);

return (0);

}

15.  Volume of Cube

#include < stdio.h >

void main()

{

            float a;

float surface_area,volume;

printf("Enter size of any side of a cube : ");

scanf("%f",&a);

surface_area = 6 * (a * a);

volume = a * a * a;

printf("Surface area of cube is: %.3f",surface_area);

printf("\nVolume of cube is : %.3f",volume);

}

16.   Volume of Cylinder

#include < stdio.h >

void main()

{

            float vol,pie=3.14;

float r,h;

printf("ENTER THE VALUE OF RADIOUS :- ");

scanf("%f",&r);

printf("ENTER THE VALUE OF HEIGHT :- ");

scanf("%f",&h);

vol = pie * r * r * h;

printf("VOLUME OF CYLINDER IS :- %3.2f ",vol);

}

 17.  Volume of Sphere

#include < stdio.h >

#include < math.h >

void main()

{

float radius,pie,volume;

pie=3.1416;

printf("Enter the radius:");

if(scanf("%f",&radius)==1)

{

volume=(4/3)*pie*pow(radius,3);

printf("The volume is :%6.2f",volume);

}

else

{

printf("error ,enter correct value");

}

18.  Check vowel

#include < stdio.h >

int main()

{

  char ch;

  printf("Input a character\n");

  scanf("%c", &ch);

  switch(ch)

  {

  case 'a':

  case 'A':

  case 'e':

  case 'E':

  case 'i':

  case 'I':

  case 'o':

  case 'O':

  case 'u':

  case 'U':

  printf("%c is a vowel.\n", ch);

  break;

  /*if ch matches any case then it prints & breaks the execution */

  default:

  printf("%c is not a vowel.\n", ch);

 /*if the ch is not from the cases then prints ch is not a vowel */

  }

  return 0;

}

19.  Leap year

#include < stdio.h >

int main()

{

  int year;

  printf("Enter a year to check if it is a leap year\n");

  scanf("%d", &year);

  if ( year%400 == 0)

  printf("%d is a leap year.\n", year);

  else if ( year%100 == 0)

  printf("%d is not a leap year.\n", year);

  else if ( year%4 == 0 )

  printf("%d is a leap year.\n", year);

  else

  printf("%d is not a leap year.\n", year);

  return 0;

}

20.  HCF and LCM

#include < stdio.h >

long gcd(long, long);

int main() {

  long x, y, hcf, lcm;

  printf("Enter two integers\n");

  scanf("%ld%ld", &x, &y);

  hcf = gcd(x, y);

  lcm = (x*y)/hcf;

  printf("Greatest common divisor of %ld and %ld = %ld\n", x, y, hcf);

  printf("Least common multiple of %ld and %ld = %ld\n", x, y, lcm);

  return 0;

}

/*if 1st no is 0 then 2nd no is gcd

make 2nd no 0 by subtracting smallest from largest and return 1st no as gcd*/

long gcd(long x, long y) {

  if (x == 0) {

  return y;

  }

  while (y != 0) {

  if (x > y) {

    x = x - y;

  }

  else {

    y = y - x;

  }

}

return x;

}