All C program

Write a C program to print ‘Hello World’ on screen.

#include <stdio.h>

#include <conio.h>

void main()

{

Printf(“hello World”)

}

Output:

Hello World

Write a ‘C’ Program To Swap the values between two variable.

#include <stdio.h>

void main()

{

int a,b,t; // variable 't' for temporary use.

printf("Enter values of 'A' and 'B' = ");

scanf("%d%d",&a,&b);

t=a;

a=b;

b=t;

printf("A=%d B=%d",a,b);

}

Output

Enter values of 'A' and 'B' = 10

A=20 B=10.

Write a ‘C’ Program To addition and Subtraction of two numbers.

#include <stdio.h>

void main()

{

int x,y,sum;

printf("Enter Two Integers : ");

scanf("%d%d",&x,&y);

sum=x+y;

printf("\nAddition = %d",sum);

}

Output:

Enter Two Integers : 12

Addition = 66

Write a ‘C’ To Multiplication and Division of two number.

#include <stdio.h>

#include <conio.h>

void main()

{

int x,y,mul;

float div;

printf("Enter Two Integers : ");

scanf("%d%d",&x,&y);

mul=x*y;

div=x/y;

printf("\nMultiplication= %d\nDivision= %f",mul,div);

}

Output:

Enter Two Integers :100

Multiplication = 1000

Division = 10.000000

Write a ‘C’ to calculate area and perimeter of circle from user input radius.

#include <stdio.h>

#include <conio.h>

void main()

{

int r;

float area,perimeter;

printf("Enter The Radius of Circle : ");

scanf("%d",&r);

area=3.14*r*r;

perimeter=2*3.14*r;

printf("\nArea =%f\nPerimeter=%f",area,perimeter);

}

Output

Enter The Radius of Circle :3

Area = 28.26000

Perimeter = 18.840000

Write a ‘C’ to calculate Sum and Average by reading 3 integer from user input.

#include <stdio.h>

#include <conio.h>

void main()

{

int x,y,z,sum;

float avg;

printf("Enter Three Integers : ");

scanf("%d%d%d",&x,&y,&z);

sum=x+y+z;

avg=sum/3.0; //3.0 to store float value

printf("\nSum =%d\nAverage =%f",sum,avg);

}

Output:

Enter Three Integers : 10

Sum = 60

Average = 20.000000

Write a ‘C’ to read Celsius from user input and convert it into Fahrenheit.

#include <stdio.h>

#include <conio.h>

void main()

{

float c,f;

printf("Enter Temperature in Celsius : ");

scanf("%f",&c);

f=c*9/5+32;

printf("\nFahrenheit = %f",f);

}

Output:

Enter Temperature in Celsius : 40

Fahrenheit = 104.00000

Write a ‘C’ to checked number entered by user is Positive or Negative.

#include <stdio.h>

#include <conio.h>

void main()

{

int x;

printf("Enter The Number : ");

scanf("%d",&x);

if(x>0)

{

printf("\n%d is Positive Integer ",x);

}

if(x<0)

{

printf("\n%d is Negative Integer ",x);

}

Output:

Enter The Number :554

544 is Positive Integer

Write a ‘C’ to find greatest number among entered 2 input value

#include <stdio.h>

#include <conio.h>

void main()

{

int x,y;

printf("Enter Two Number : ");

scanf("%d%d",&x,&y);

if(x>y)

{

printf("\n%d is Greatest Number ",x);

}

if(x<y)

{

printf("\n%d is Greatest Number ",y);

}

Output:

Enter Two Number : 765

698

765 is Greatest Number

To Print Appropriate Message

If Pressed…	Message
A	Excellent
B	Very Good
C	Fair
D	Poor

#include <stdio.h>

#include <conio.h>

void main()

{

char c;

printf("Enter The Character : ");

scanf("%c",&c);

if(c=='A')

{

printf("\nExcellent");

}

if(c=='B')

{

printf("\nVery Good");

}

if(c=='C')

{

printf("\nFair");

}

if(c=='D')

{

printf("\nPoor");

}

Output:

Enter The Character : B

Very Good

Write a ‘C’ to determine even or Odd integers by user input

#include<stdio.h>

#include <conio.h>

void main()

{

int n=2;

printf("Enter The Number : ");

scanf("%d",&n);

if(n%2==0)

{

printf("\n%d is Even Number",n);

}

else

{

printf("\n%d is odd number",n);

}

Output:

Enter The Number : 7

7 is odd number

Write a ‘C’ to check complete divisibility of number entered by user.

#include<stdio.h>

void main()

{

int n,div;

printf("\nEnter The Number : ");

scanf("%d",&n);

printf("\nEnter The Divisor : ");

scanf("%d",&div);

if(n%div==0)

{

printf("\n%d is completely divisible by %d",n,div);

}

else

{

printf("\n%d is not completely divisible by %d",n,div);

}

Output:

Enter The Number : 345

Enter The Divisor : 13

345 is not completely divisible by 13

Write a ‘C’ to determine the character entered is vowel or not

#include<stdio.h>

#include <conio.h>

void main()

{

char c;

printf("\nEnter The Alphabet : ");

scanf("%c",&c);

if(c==’A’ || c==’E’ || c==’I’ || c==’O’ || c==’U’) //Used Logical ‘OR’

{

printf("\n%c is vowel",c);

}

else

{

printf("\n%c is not vowel”,c);

}

Output:

Enter The Alphabet : I

I is vowel

To read age and print message

Age	Message
Less than 18	Children
18-60	Young
Above 60	Old

Write a ‘C’ to read from user input and print message.

#include<stdio.h>

#include <conio.h>

void main()

{

int age;

printf("\nEnter The age : ");

scanf("%d",&age);

if(age<18)

{

printf("\nYou are children");

}

else if(age>=18 && age<60)

{

printf("\nYou are Young”);

}

else if(age>=60 && age<=110)

{

printf("\nYou are Old");

}

else

{

printf("\nInvalid Age");

}

Output:

Enter The age : 45

You are Younger

To read marks and print message

Marks	Message
Less than 40	Failed
40-60	Pass
60-80	First Class
80-100	Distinction
Any Other	Invalid Marks Input

Write a ‘C’ to print grade by user input marks.

#include<stdio.h>

#include <conio.h>

void main()

{

int m;

printf("\nEnter The Marks : ");

scanf("%d",&m);

if(m<40)

{

printf("\nFailed");

}

else if(m>=40 && m<60) //Used Logical ‘AND’

{

printf("\nPass”);

}

else if(m>=60 && m<=80)

{

printf("\nFirst Class");

}

else if(m>=80 && m<=100)

{

printf("\nDistinction");

}

else

{

printf("\nInvalid Marks Input");

}

Output:

Enter The Marks : 75

First Class

Write a ‘C’ to read integers and print largest among three integers.

#include<stdio.h>

#include <conio.h>

void main()

{

int x,y,z;

printf("\nEnter Three Integers : ");

scanf("%d%d%d",&x,&y,&z);

if(x>y && x>z)

{

printf("\n%d is greatest number",x);

}

else if(y>z)

{

printf("\n%d is greatest number”,y);

}

else

{

printf("\n%d is greatest number",z);

}

Output:

Enter Three Integers : 45

65 is greatest number.

Write a ‘C’ to read character from user and print if it is vowel or not.

#include<stdio.h>

#include <conio.h>

void main()

{

char c;

printf("\nEnter The Character : ");

scanf("%c",&c);

switch(c)

{

case ‘a’:

case ‘A’:printf(“\n%c is a vowel”,c);break;

case ‘e’:

case ‘E’:printf(“\n%c is a vowel”,c);break;

case ‘i’:

case ‘I’:printf(“\n%c is a vowel”,c);break;

case ‘o’:

case ‘O’:printf(“\n%c is a vowel”,c);break;

case ‘u’:

case ‘U’:printf(“\n%c is a vowel”,c);break;

default :printf(“\n%c is not a vowel”,c);

}

Output:

Enter The Character : Z

Z is not a vowel.

Write a ‘C’ to read integer from user and perform operation according to number.

#include<stdio.h>

void main()

{

int n,x;

printf("\nEnter 1 or 2 : ");

scanf("%d",&n);

x=(n==1)?10:20;

printf("\nX=%d”,x);

}

Output:

Enter 1 or 2 : 1

X=10

Write a ‘C’ to print Hello world ten times using for loop.

#include<stdio.h>

void main()

{

int i;

for(i=1;i<=10;i++)

{

printf("\nHello World");

}

Output:

Hello World

Write a ‘C’ to print number 1 to 10 using for loop

#include<stdio.h>

void main()

{

int i;

for(i=1;i<=10;i++)

{

printf("\n %d",i);

}

Output:

Write a ‘C’ to print number 10 to 1 using for loop

#include<stdio.h>

void main()

{

int i;

for(i=10;i>=1;i--)

{

printf("\n %d",i);

}

Output:

Write a c program to print Multiplication table of given number

#include<stdio.h>

void main()

{

int i,n,m;

printf(“Enter The Number : “);

scanf(“%d“,&n);

for(i=1;i<=10;i++)

{

m=i*n;

printf("\n %d",m);

}

Output:

Enter The Number : 25

100

125

150

200

225

250

Write a c program to print sum of first ten numbers using for loop

#include<stdio.h>

void main()

{

int i,sum=0; //sum contains garbage value

for(i=1;i<=10;i++)

{

sum=i+sum;

}

printf("\n Sum of first Ten Digit numbers =%d",sum);

}

Output:

Sum of first ten digit number = 55

Write a C program to read integer from user then calculate and print its factorial using for loop.

#include<stdio.h>

void main()

{

int i,n,fact=1; //’fact’ contains garbage value. to perform multiplication it is assigned to 1

printf(“\nEnter the number : ”);

scanf(“%d”,&n);

for(i=1;i<=n;i++)

{

fact=fact*i;

}

printf("\n%d! =%d",n,fact);

}

Output:

Enter the number : 6

6! = 720

Write a c program to read integer from user then calculate and print its power using for loop.

#include<stdio.h>

void main()

{

int i,x,y,pow=1;

printf("\n Enter the Base : ");

scanf("%d",&x);

printf("\n Enter the Index : ");

scanf("%d",&y);

for(i=1;i<=y;i++)

{

pow=pow*x;

}

printf("\n %d^%d = %d",x,y,pow);

}

Output:

Enter the Base : 2

Enter the Index : 5

2^5 = 32

Write a C program to read integer from user and calculate if it is prime number or Not.

#include<stdio.h>

void main()

{

int n,i,c=0;

printf("\n Enter the Number : ");

scanf("%d",&n);

for(i=2;i<n;i++)

{

if(n%i==0)

{

c++;

}

if(c==0)

{

printf("\n %d is Prime Number",n);

}

else

{

printf("\n %d is Not Prime Number",n);

}

Output:

Enter the Number : 4

4os not Prime Number

Write a C program To print Fibonacci series.

#include<stdio.h>

void main()

{

int i,x=0,y=1,s;

printf("\nFibonacci Series : ");

printf("\n%d\t%d",x,y);

for(i=1;i<20;i++)

{

s=x+y;

printf("\t%d",s);

x=y;

y=s;

}

Output:

Fibonacci Series :

0 1 1 2 3

610 978 1597 2584 4181

Write A C program to read from number from user and then calculate sum of digits in it using while loop.

#include<stdio.h>

void main()

{

int n,r,sum=0;

printf("\nEnter the Numbers : ");

scanf("%d",&n);

while(n!=0)

{

r=n%10;

sum=sum+r;

n=n/10;

}

printf("\nSum of Digits of Number = %d",sum);

}

Output:

Enter the Numbers : 444

Sum of Digit of Number = 12

Write a C program to read number from user and then calculate occurrences of digit using while loop.

#include<stdio.h>

void main()

{

int n,r,s,c=0;

printf("\nEnter the Numbers : ");

scanf("%d",&n);

printf("\nEnter the Digit to Count : ");

scanf("%d",&s);

while(n!=0)

{

r=n%10;

if(r==s)

{

c++;

}

n=n/10;

}

printf("\n%d Occurs %d times",s,c);

}

Output:

Enter the Numbers : 112311

Enter the Digit to Count : 1

1 Occurs 4 time

Write a C program to read number from user and then calculate reverse of number using while loop.

#include<stdio.h>

void main()

{

int n,r,rev=0;

printf("\nEnter the Number : ");

scanf("%d",&n);

while(n!=0)

{

r=n%10;

rev=rev*10+r;

n=n/10;

}

printf("\nReverse Number = %d",rev);

}

Output:

Enter the Number : 1234

Reverse Number = 4321

Write a C program to read number from user and then print its multiplication table using do while loop.

#include<stdio.h>

void main()

{

int n,i=1,m;

printf("\nEnter the Number : ");

scanf("%d",&n);

printf("\nMultiplication Table of %d : ",n);

{

m=n*i;

printf(“\n%d”,m);

i++;

}while(i<=10);

}

Output:

Enter the Number : 12

Multiplication Table of 12 :

108

120

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