Table of Contents
Introducing you the important programs of C language with coding . These programs are provided by Mr. Anuj Khanna (Asst. Professor),Krishna Institute of Technology,Kanpur
Topics
Arithmetic Operation, if – else Statements
Switch- Case Statements, Loops & Iterations
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Important C Programs with Coding
Basic Programs
1. Program to find the simple interest, given principle, rate of interest and time.
#include <stdio.h>
#include <conio.h>
void main()
{
float p, r, si;
int t;
clrscr();
printf(“Enter the values of p,r and t\n”);
scanf (“%f %f %d”, &p, &r, &t);
si = (p * r * t)/ 100.0;
printf (“Amount = Rs. %5.2f\n”, p);
printf (“Rate = Rs. %5.2f%\n”, r);
printf (“Time = %d years\n”, t);
printf (“Simple interest = %5.2f\n”, si);
getch() ;
}
2.Ramesh’s basic salary is input through the keyboard. His dearness allowance is 40% of basic salary, andhouse rent allowance is 20% of basic salary. Write a program to calculate his Gross Salary.
#include<stdio.h>
#include<conio.h>
void main()
{
float bs , da= 0.0, hra=0.0 ,gross=0.0 ;
clrscr() ;
printf(“Enter the basic salary\n”) ;
scanf(“%f” ,&bs) ;
printf(“BASIC SALARY OF RAMESH=%f\n ”, bs) ;
da = (bs*40) / 100 ;
hra = (bs *20) /100 ;
gross = bs + da + hra ;
printf(“*************************************************** ”) ;
printf(“GROSS SALRY OF RAMESH = % f ”, gross) ;
getch() ;
}
3. Program to find the area of a circle, given the radius.
#include <stdio.h>
#include <conio.h>
#include <math.h>
#define PI 3.142
void main()
{
float radius, area;
clrscr();
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);
getch() ;
}
**Note : Similarly we can compute area of rectangle also.
4. Program to find the area of a triangle, given three sides a, b and c.
#include <stdio.h>
#include <conio.h>
#include <math.h>
void main()
{ float a, b, c ;
float s =0.0 , area =0.0 ;
clrscr();
printf(“Enter the values of a,b and c\n”);
scanf (“%f %f%f “, &a, &b, &c);
s = (a + b + c) / 2; /* computes perimeter */
area = sqrt ( s * (s-a) * (s-b) * (s-c)); /* compute the area */
printf (“Area of a triangle = %f\n”, area);
}
5. Program to swap the values of two variables without using third variable.
#include<stdio.h>
#include<conio.h>
void main()
{
int a , b ;
clrscr() ;
printf(“Enter the values of a and b \n”) ;
scanf(“%d %d” ,&a , &b) ;
printf(“Values variables before swapping are a=%d \t b=%d: \n”, a , b) ;
a = a + b ;
b = a – b ;
a = a – b ;
printf(“Values of a and b after swapping are:\n”) ;
printf(“a=%d\t\t b=%d”,a ,b) ;
getch();
}
Operators
6. Program for finding the sum of a five digit no.
#include<stdio.h>
#include<conio.h>
void main()
{
long int num , sum =0 , rem ; // Max. five digit no. can be 99999, so long int declared
clrscr() ;
printf(“Enter the five digit number\n”) ;
scanf(“%ld” , &num) ;
printf(“The five digit number=%ld\n”, num) ;
rem1 = num%10 ;
num = num /10 ;
rem2 = num%10 ;
num = num /10 ;
rem3 = num%10 ;
num=num/10 ;
rem4 = num%10;
num=num/10 ;
sum = rem1 + rem2 + rem3 + rem4 + num ;
printf(“Sum of the digits of %ld =%ld”, num ,sum) ;
getch();
}
7.Program to multiply a given number with 2n ,without using multiplication operator.
#include<stdio.h>
#include<conio.h>
void main()
{
int num , n , result ;
clrscr() ;
printf(“Enter the number to be multiplied \n”) ;
scanf(“%d” ,&num) ;
printf(“Enter the value of n \t”) ;
scanf(“%d”, &n) ;
result = num << n ;
printf(“Result of multiplication = %d”, result);
getch() ;
}
if – else Statements
8. Program to find and output all the roots of a quadratic equation, for non-zero coefficients. In case of errors your program should report suitable error message
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <math.h>
void main()
{
float A, B, C, root1, root2;
float realp, imagp, disc;
clrscr();
printf(“Enter the values of A, B and C\n”);
scanf(“%f %f %f”, &A,&B,&C);
/* If A = 0, it is not a quadratic equation */
if( A==0 || B==0 || C==0)
{
printf(“Error: Roots cannot be determined\n”);
exit(1);
}
else
{
disc = B*B – 4.0*A*C;
if(disc < 0)
{
printf(“Imaginary Roots\n”);
realp = -B/(2.0*A) ;
imagp = sqrt(abs(disc))/(2.0*A);
printf(“Root1 = %f +i %f\n”,realp, imagp);
printf(“Root2 = %f -i %f\n”,realp, imagp);
}
else if(disc == 0)
{
printf(“Roots are real and equal\n”);
root1 = -B/(2.0*A);
root2 = root1;
printf(“Root1 = %f \n”,root1);
printf(“Root2 = %f \n”,root2);
}
else if(disc > 0 )
{
printf(“Roots are real and distinct\n”);
root1 =(-B+sqrt(disc))/(2.0*A);
root2 =(-B-sqrt(disc))/(2.0*A);
printf(“Root1 = %f \n”,root1);
printf(“Root2 = %f \n”,root2);
}
}
} /* End of main() */
9. Write a C program to find the largest of three numbers.
#include <stdio.h>
#include <conio.h>
#include <math.h>
void main()
{
int a, b, c; clrscr();
printf(“Enter the values of a,b and c\n”);
scanf (“%d %d %d”, &a, &b, &c);
printf (“a = %d\tb = %d\tc = %d\n”, a,b,c);
if ( a > b)
{
if ( a > c)
{
printf (“A is the greatest among three\n”);
}
else
{
printf (“C is the greatest among three\n”);
}
}
else if (b > c)
{
printf (“B is the greatest among three\n”);
}
else
printf (“C is the greatest among three\n”); }
10. Write a C program to check whether a given integer is odd or even.
#include <stdio.h>
#include <conio.h>
void main()
{
int ival, remainder;
clrscr();
printf(“Enter an integer :”);
scanf (“%d”, &ival);
remainder = ival % 2;
if (remainder == 0)
{
printf (“%d, is an even integer\n”, ival);
else
printf (“%d, is an odd integer\n”, ival);
}
} /* End of main() */
11. Program to determine whether a year is a leap year or not using logical operator.
#include<stdio.h>
#include<conio.h>
void main()
{ int year ;
clrscr() ;
printf (“Enter the year : \n” ) ;
scanf(“%d” & year ) ;
if ( ( (year % 4 = = 0 ) && (year % 100 !=0) ) || (year % 4 00= = 0 ) )
printf(“%d is a leap year” , year) ;
else
printf(“%d is not a leap year” , year) ;
getch () ;
}
12. Program to determine whether a triangle is right angle , scalene, equilateral or isosceles where the Sides a , b and c are entered by the user. Also check whether the triangle is possible or not?
#include<stdio.h>
#include<conio.h>
void main()
{ float a , b , c ;
clrscr() ;
printf ( “Enter the sides of the triangle : \n” ) ;
scanf(“%f %f %f ” , & a , & b , &c) ;
if ((a + b < c) || (b + c < a) || ( a + c < b) )
printf (“Triangle is NOT POSSIBLE” ) ;
if ( (a * a = = b * b + c * c) || (b * b = = a * a + c * c) ) || (c * c = = a * a + c * c) ) ;
printf( “ Triangle is RIGHT ANGLED” ) ;
if ((a = = b ) && (b != c)) ;
printf( “Triangle is ISOSCELES”) ;
if ((b = = c ) && (c!= a)) ;
printf( “Triangle is ISOSCELES”) ;
if ((c = = a ) && (a != b)) ;
printf( “Triangle is ISOSCELES”) ;
if ( ( a = = b) && ( b = = c) ) ;
printf( “ Triangle is EQUILATERAL” ) ;
if ( (a != b) && (b != c) && (c!=a) ) ;
printf( “ Triangle is SACLENE” ) ;
getch () ;
}
Switch- Case Statements
13. Program to simulate a simple calculator to perform arithmetic operations.Error message should be reported if any attempt is made to divide by zero.
#include <stdio.h>
#include <conio.h>
void main()
{
char oper; /* oper is an operator to be selected */
float n1, n2, result;
clrscr();
printf (“Simulation of a Simple Calculator\n\n”);
printf(“Enter two numbers\n”);
scanf (“%f %f”, &n1, &n2);
printf(“Enter the operator [+,-,*,/]\n”);
scanf (“%c”, &oper);
switch (oper)
{
case ‘+’: result = n1 + n2;
break;
case ‘-‘: result = n1 – n2;
break;
case ‘*’: result = n1 * n2;
break;
case ‘/’: result = n1 / n2;
break;
default : printf (“Error in operation\n”);
break;
}
printf (“\n%5.2f %c %5.2f= %5.2f\n”, n1,oper, n2, result);
}
Loops & Iterations
14. Write a C program to find the factorial of a given number
#include<conio.h>
#include <stdio.h>
void main()
{
long int i,fact=1,num;
clrscr() ;
printf(“Enter the number\n”);
scanf(“%ld”,&num);
if( num <= 0)
fact = 1;
else
{
for(i = 1; i <= num; i++)
{ fact = fact * i ;}
} /* End of else */
printf(“Factorial of %ld =%ld\n”, num, fact ); } /* End of main() */
15. Program to generate the table of any number using loop
#include<stdio.h>
#include<conio.h>
void main()
{
int t , num , t ;
clrscr() ;
printf (“Enter the number whose table is to be generated : \n” ) ;
scanf(“%d”, & num ) ;
printf ( “ Table of %d is :” , num) ;
for ( i=1 ; i<= 10 ; i++ )
{
t = num * i ;
printf( “\n %d x %d = %d ” , num , i , t ) ;
}
getch () ;
}
16. Program to check whether a given number is prime or not and output the given number with suitable message.
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
void main()
{
int num, j, flag;
clrscr();
printf(“Enter a number\n”);
scanf(“%d”, &num);
if ( num <= 1)
{
printf(“%d is not a prime numbers\n”, num);
exit(1);
}
flag = 0;
for ( j=2; j<= num/2; j++)
{ if( ( num % j ) == 0)
{ flag = 1;
break; }
}
if(flag == 0)
printf(“%d is a prime number\n”,num);
else
printf(“%d is not a prime number\n”, num); }
17.Program to generate Fibonacci sequence Fibonacci sequence is 0 1 1 2 3 5 8 13 21.
#include <stdio.h>
#include <stdio.h>
void main()
{
int fib1=0, fib2=1, fib3, limit, count=0;
printf(“Enter the limit to generate the fibonacci sequence\n”);
scanf(“%d”, &limit);
printf(“Fibonacci sequence is …\n”);
printf(“%d”,fib1);
printf(“%d”,fib2);
count = 2; /* fib1 and fib2 are already used */
while( count < limit)
{
fib3 = fib1 + fib2; count ++;
printf(“%d\n”,fib3);
fib1 = fib2;
fib2 = fib3;
}
} /* End of main() */
18. Program to accept an integer and reverse it.
#include<conio.h>
#include <stdio.h>
void main()
{
long num, rev = 0, temp, digit;
printf(“Enter the number\n”); /*For better programming,choose ‘long int’ */
scanf(“%ld”, &num); /*reverse of a five digit no. can be out of range of integer*/
temp = num;
while(num > 0)
{
digit = num % 10;
rev = rev * 10 + digit;
num /= 10;
}
printf(“Given number = %ld\n”, temp);
printf(“Its reverse is = %ld\n”, rev);
}
