Programming in C : 20 Important Questions of Programming in C.
20 Important Questions of Programming in C.
Question : Write a C Program to find area and circumference of
circle.
/*
Write
a C Program to find area and circumference of circle.
Formula:
Area = 3.14 * radius * radius
Circumference = 2 * 3.14 * radius
Area = 3.14 * radius * radius
Circumference = 2 * 3.14 * radius
Program
*/
#include <stdio.h>
int main()
{
int circle_radius;
float
PI_VALUE=3.14, circle_area,
circle_circumf;
//Ask user to enter the radius of circle
printf("\nEnter radius of circle: ");
//Storing the user input into variable
circle_radius
scanf("%d",&circle_radius);
//Calculate and display Area
circle_area
= PI_VALUE * circle_radius * circle_radius;
printf("\nArea of circle is: %f ",circle_area);
//Caluclate and display Circumference
circle_circumf
= 2 * PI_VALUE * circle_radius;
printf("\nCircumference
of circle is: %f ",circle_circumf);
return (0);
}
OUTPUT :
Enter radius of circle: 2
Area of circle is: 12.560000
Circumference of circle is: 12.560000
Question : Write a C Program to find the simple interest.
/*
Write
a C Program to find the simple interest.
SI = (principle * time * rate) / 100
*/
#include <stdio.h>
intmain()
{
floatprinciple,time,rate,SI;
/* Input principle, rate and time */
printf("Enter principle (amount): ");
scanf("%f",&principle);
printf("Enter time: ");
scanf("%f",&time);
printf("Enter rate: ");
scanf("%f",&rate);
/* Calculate simple interest */
SI=(principle*time*rate)/100;
/* Print the resultant value of SI */
printf("Simple Interest = %f ",SI);
return (0);
}
OUTPUT
:
Enter
principle (amount): 1200
Enter
time: 2
Enter
rate: 5.4
Simple
Interest = 129.600006
Question : Write a C Program to perform basic arithmetic operations
which are addition, subtraction, multiplication and division of two numbers.
Numbers are assumed to be integers and will be entered by the user.
/*
Write
a C Program to perform basic arithmetic operations which are addition,
subtraction, multiplication and division of two numbers. Numbers are assumed to
be integers and will be entered by the user.
Addition = First Number + Second Number
Subtraction = First Number - Second Number
Multiplication = First Number * Second Number
Division = First Number / (float) Second Number
Subtraction = First Number - Second Number
Multiplication = First Number * Second Number
Division = First Number / (float) Second Number
*/
#include <stdio.h>
int main()
{
int first, second, add, subtract, multiply;
float divide;
printf("Enter First integers\n");
scanf("%d ", &first);
{
int first, second, add, subtract, multiply;
float divide;
printf("Enter First integers\n");
scanf("%d ", &first);
printf("Enter Second integers\n");
scanf("%d",&second);
add = first + second;
subtract = first - second;
multiply = first * second;
divide = first / (float)second; /*typecasting*/
scanf("%d",&second);
add = first + second;
subtract = first - second;
multiply = first * second;
divide = first / (float)second; /*typecasting*/
printf("Sum = %d\n", add);
printf("Difference = %d\n", subtract);
printf("Multiplication = %d\n", multiply);
printf("Division = %.2f\n", divide);
return (0);
printf("Difference = %d\n", subtract);
printf("Multiplication = %d\n", multiply);
printf("Division = %.2f\n", divide);
return (0);
}
OUTPUT :
Enter First integers
7
Enter Second integers
3
Sum = 10
Difference = 4
Multiplication = 21
Division = 2.33
Question : Write a C Program to find greatest in 3
numbers.
/*
Write
a C Program to find greatest in 3 numbers.
*/
#include <stdio.h>
int main()
{
int num1,num2,num3;
//Ask user to input any three integer numbers
printf("\nEnter value of num1, num2 and num3:");
//Store input values in variables for comparsion
scanf("%d %d %d",&num1,&num2,&num3);
if((num1>num2)&&(num1>num3))
{
printf("\n Number1 is greatest");
}
else if((num2>num3)&&(num2>num1))
{
printf("\n Number2 is greatest");
}
else
{
printf("\n Number3 is greatest");
}
return (0);
}
OUTPUT :
Enter value of num1, num2 and num3: 15 200 101
Number2 is greatest
Question : Write a C Program to find Area of Right
Angled Triangle.
/*
Write a C Program to find Area of Right Angled Triangle.
Area = 0.5 * height * width
*/
#include <stdio.h>
int main()
{
float height, width;
float area;
printf("Enter height of the given triangle:\n ");
scanf("%f ", &height);
printf("Enter width of the given triangle:\n ");
scanf("%f", &width);
area = 0.5 * height * width;
printf("Area of right angled triangle is: %.3f\n", area);
return (0);
}
OUTPUT :
Enter height of the given triangle:
10
Enter width of the given triangle:
15
Area of right angled triangle is: 75.000
Question : Write a C Program to find Area of Square.
/*
Write
a C Program to find Area of Square.
Area of Square = Square_Side * Square_Side*/
#include <stdio.h>
intmain()
{intsquare_side, area;
printf("Enter the side of square: ");
scanf("%d", &square_side);
//calculation of the area area = square_side * square_side;printf("Area of the square: %d", area);
return (0);}
OUTPUT :
Enter
the side of square: 8Area
of the square:64
Question : Write a C Program to swap two numbers with
and without using third variable.
/*
Write
a C Program to swap two numbers with and without using third variable.
*/
#include <stdio.h>
#include<conio.h>
void
main()
{
int a,b;
clrscr();
printf("Enter the Values for a & b to Swap: ");
scanf("%d %d",&a,&b);
a=a+b;
b=a-b;
a=a-b;
printf("After Swapping the Values of a & b are :%d
%d",a,b);
getch();
}
OUTPUT :
Enter
the Values for a & b to Swap: 10 20
After
Swapping the Values of a & b are :20 10
Question : Write a C Program to find Area of
Rectangle.
/*
Write
a C Program to find 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);
}
OUTPUT
:
Enter the Length of Rectangle : 5
Enter the Breadth of Rectangle : 4
Area of Rectangle : 20
Question : Write a C Program to calculate sum of 5 subjects and find percentage.
/*
Write
a C Program to calculate sum of 5
subjects and find percentage.
*/
#include
<stdio.h>
int
main()
{
int s1, s2, s3, s4, s5, sum, total = 500;
float
per;
printf("\n Enter 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) / total;
printf("\nPercentage : %f", per);
return (0);
}
OUTPUT
:
Enter marks of 5 subjects : 80 70 90
80 80
Sum : 400
Percentage : 80.00
Question : Write a Write a C Program to reverse a number.
/*
Write a Write a C Program to reverse a number.
*/
#include
<stdio.h>
int
main()
{
int n, rev = 0, remainder;
printf("Enter an integer: ");
scanf("%d", &n);
while (n != 0)
{
remainder
= n % 10;
rev = rev * 10 + remainder;
n /= 10;
}
printf("Reversed number = %d", rev);
return (0);
}
OUTPUT
:
Enter
an integer: 2345
Reversed
number = 5432
Question : Write a C Program to check whether a number
is palindrome or not.
/*
Write
a C Program to check whether a number is palindrome or not.
*/
#include
<stdio.h>
int
main()
{
int n, reversedN = 0, remainder, originalN;
printf("Enter an integer: ");
scanf("%d", &n);
originalN = n;
//
reversed integer is stored in reversedN
while (n != 0)
{
remainder = n % 10;
reversedN = reversedN * 10 +
remainder;
n
/= 10;
}
//
palindrome if orignalN and reversedN are equal
if (originalN == reversedN)
{
printf("%d is a palindrome.", originalN);
}
else
{
printf("%d is not a palindrome.", originalN);
}
return (0);
}
OUTPUT
:
Enter
an integer: 1001
1001
is a palindrome.
Question : Write a C Program to check whether a number
is prime or not.
/*
Write
a C Program to check whether a number is prime or not.
*/
#include
<stdio.h>
main()
{
int n, i, c = 0;
printf("Enter any number n:");
scanf("%d", &n);
/*logic*/
for (i = 1; i <= n; i++)
{
if (n % i == 0)
{
c++;
}
}
if (c == 2)
{
printf("n is a Prime number");
}
else
{
printf("n is not a Prime number");
}
return (0);
}
OUTPUT
:
Enter
any number n: 7
n
is Prime number
Question : Write a C Program to check whether a number
is Armstrong or not.
#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;
}
OUTPUT
:
enter
the number=153
armstrong
number
Question : Write a
C Program for Fibonacci series.
#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;
}
OUTPUT :
Enter
the number of elements:15
0
1 1 2 3 5 8 13 21 34 55 89 144 233 377
Question : Write a C Program to find ASCII value of a
character entered by user.
#include
<stdio.h>
int
main()
{
char c;
printf("Enter a character: ");
scanf("%c", &c);
//
%d displays the integer value of a character
//
%c displays the actual character
printf("ASCII value of %c
= %d", c, c);
return 0;
}
OUTPUT
:
Enter
a character: G
ASCII
value of G = 71
Question : Write a C Program to find minimum element
in array.
/*
Write
a C Program to find minimum element in array.
*/
#include
<stdio.h>
int
main()
{
int array[100], minimum, size, c, location = 1;
printf("Enter number of elements in array\n");
scanf("%d", &size);
printf("Enter %d integers\n", size);
for
(c = 0; c < size; c++)
scanf("%d", &array[c]);
minimum = array[0];
for (c = 1; c < size; c++)
{
if
(array[c] < minimum)
{
minimum = array[c];
location =
c+1;
}
}
printf("Minimum element is present at location %d and its
value is %d.\n", location, minimum);
return 0;
}
OUTPUT :
Enter
number of elements in array
5
Enter
5 integers
2
5
4
1
6
Minimum
element is present at location 4 and its value is 1.
Question : Write a C Program to check whether a year
is leap year or not.
/*
Write
a C Program to check whether a year is leap year or not.
*/
#include
<stdio.h>
int
main()
{
int year;
printf("Enter a year: ");
scanf("%d", &year);
if (year % 4 == 0)
{
if (year % 100 == 0)
{
//
the year is a leap year if it is divisible by 400.
if
(year % 400 == 0)
{
printf("%d is a leap year.", year);
}
else
{
printf("%d is not a leap year.", year);
}
}
else
{
printf("%d is a leap year.", year);
}
}
else
{
printf("%d is not a leap year.", year);
}
return 0;
}
OUTPUT
:
Enter
a year: 1900
1900
is not a leap year.
Question : Write a C Program to check whether a number
is positive or negative.
/*
Write
a C Program to check whether a number is positive or negative.
*/
#include
<stdio.h>
int
main()
{
double num;
printf("Enter a number: ");
scanf("%lf", &num);
if (num <= 0.0)
{
if (num == 0.0)
{
printf("You entered 0.");
}
else
{
printf("You entered a negative number.");
}
}
else
{
printf("You entered a positive number.");
}
return 0;
}
OUTPUT
:
Enter
a number: 12.3
You
entered a positive number.
Question : Write a C Program to find the factorial of
a number.
/*
Write
a C Program to find the factorial of a number.
*/
#include
<stdio.h>
int
main()
{
int n, i;
unsigned
long long fact = 1;
printf("Enter an integer: ");
scanf("%d", &n);
// shows error if the user
enters a negative integer
if (n < 0)
{
printf("Error! Factorial of a negative number doesn't
exist.");
}
else
{
for (i = 1; i <= n; ++i)
{
fact *= i;
}
printf("Factorial of %d = %llu", n, fact);
}
return 0;
}
OUTPUT
:
Enter
an integer: 10
Factorial
of 10 = 3628800
Question : Write a C Program to Count Number of Digits
in an Integer.
/*
Write
a C Program to Count Number of Digits in an Integer.
*/
#include
<stdio.h>
int
main()
{
long long num;
int
count = 0;
/* Input number from user */
printf("Enter any number: ");
scanf("%lld", &num);
/*
Run loop till num is greater than 0 */
while(num != 0)
{
/* Increment digit count */
count++;
/* Remove last
digit of 'num' */
num /= 10;
}
printf("Total digits: %d", count);
return 0;
}
OUTPUT
:
Enter
any number: 45698
Total
digits: 5
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