Programs to understand the basic data types and I/O
// Program to show the use of basic datatypes
#include<stdio.h>
void main()
{
int a;
float b;
double c;
long double sum;
char d;
clrscr();
printf("Enter the values of a,b and c: \n");
scanf("%d%f%lf",&a,&b,&c);
sum = a + b + c;
printf("Sum = %Lf\n",sum);
printf("Enter a character: ");
scanf("%s",&d);
printf("Entered character = %c",d);
getch();
}
Programs on operator and Expressions
//Program to accept Empcode,Emp Name and Basic Salary
#include<stdio.h>
void main()
{
int empcode;
char name;
float bp,da,hra,ca,ta,gross,ded,pt,it,net;
clrscr();
printf("Enter the Employee code\n");
scanf("%d",empcode);
printf("Enter the Name of the Employee\n");
scanf("%s",&name);
printf("Enter the Basic Pay of the Employee\n");
scanf("%f",&bp);
da=10.0/100.0*bp;
hra=5/100*bp;
ca=12/100*bp;
ta=200;
gross=bp+da+hra+ca+ta;
pt=5.0/100.0*bp;
it=10.0/100.0*bp;
//total deductions are
ded=pt+it;
//net salary
net=gross-ded;
printf("The Basic Salary is=%f",bp);
printf("Gross Salary is =%.2f\n",gross);
printf("Total deduction =%.2f\n",ded);
printf("Net Salary =%.2f\n",net);
getch();
}
Programs on Decision Statements
//largest of 3 numbers
#include <stdio.h>
void main()
{
int num1, num2, num3;
printf("Enter the values of num1, num2 and num3\n");
scanf("%d %d %d", &num1, &num2, &num3);
printf("num1 = %d\tnum2 = %d\tnum3 = %d\n", num1, num2, num3);
if (num1 > num2)
{
if (num1 > num3)
{
printf("num1 is the greatest among three \n");
}
else
{
printf("num3 is the greatest among three \n");
}
}
else if (num2 > num3)
printf("num2 is the greatest among three \n");
else
printf("num3 is the greatest among three \n");
getch();
}
//even or odd
#include <stdio.h>
void main()
{
int number;
clrscr();
printf("Enter an integer: ");
scanf("%d", &number);
if(number % 2 == 0)
printf("%d is even.", number);
else
printf("%d is odd.", number);
getch();
}
//leap year
#include <stdio.h>
void main()
{
int year;
clrscr();
printf("Enter a year: ");
scanf("%d",&year);
if(year%4 == 0)
{
if( year%100 == 0)
{
// year is divisible by 400, hence the year is a leap year
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);
getch();
}
//given number is positive or negative
#include <stdio.h>
void main()
{
int num;
clrscr();
printf("Enter a number: \n");
scanf("%d", &num);
if (num > 0)
printf("%d is a positive number \n", num);
else if (num < 0)
printf("%d is a negative number \n", num);
else
printf("0 is neither positive nor negative");
getch();
}
// To find the roots of a quadratic equation
#include<stdio.h>
#include<math.h>
void main()
{
int a,b,c;
float x,x1,x2,disc,disc1;
clrscr();
printf("Enter the values of a,b and c\n");
scanf("%d",&a);
scanf("%d",&b);
scanf("%d",&c);
if(a==0)
{
x = - b / c;
printf("x = %.2f \n",x);
}
else
{
disc =sqrt((b*b)-4*a*c);
if (disc==0)
{
printf("Roots are real and repeated");
x1 = - b / 2 * a;
x2 = - b / 2 * a;
printf("x1 = %.2f and x2 = %.2f \n",x1,x2);
}
else if (disc>0)
{
printf("Roots are real and distinct \n");
x1=(- b + sqrt(disc)) / 2 * a;
x2=(- b - sqrt(disc)) / 2 * a;
printf("x1 = %.2f and x2 = %.2f \n",x1,x2);
}
else
{
printf("Roots are complex conjugative roots \n");
disc1=abs(disc);
x1=(- b + sqrt(disc1)) / 2 * a;
x2=(- b - sqrt(disc1)) / 2 * a;
printf("x1 = %.2f and x2 = %.2f",x1,x2);
}
}
getch();
}
Programs on Looping
//factorial of a given number
#include <stdio.h>
void main()
{
int n, i;
unsigned long long factorial = 1;
clrscr();
printf("Enter an integer: ");
scanf("%d",&n);
// show 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)
{
factorial *= i; // factorial = factorial*i;
}
printf("Factorial of %d = %llu", n, factorial);
}
getch();
}
//print right triangle pattern
#include <stdio.h>
int main()
{
int i, j, n;
/* Input number of rows from user */
printf("Enter value of n: ");
scanf("%d", &n);
for(i=1; i<=n; i++)
{
/* Print i number of stars */
for(j=1; j<=i; j++)
{
printf("*");
}
/* Move to next line */
printf("\n");
}
return 0;
}
//given number is prime or not
#include <stdio.h>
void main()
{
int n, i, flag = 0;
clrscr();
printf("Enter a positive integer: ");
scanf("%d",&n);
for(i=2; i<=n/2; ++i)
{
// condition for nonprime number
if(n%i==0)
{
flag=1;
break;
}
}
if (flag==0)
printf("%d is a prime number.",n);
else
printf("%d is not a prime number.",n);
getch();
}
//sum of n natural numbers
#include <stdio.h>
void main()
{
int i, num, sum = 0;
clrscr();
printf("Enter an integer number \n");
scanf ("%d", &num);
for (i = 1; i <= num; i++)
{
sum = sum + i;
}
printf ("Sum of first %d natural numbers = %d\n", num, sum);
getch();
}
//find Fibonacci sequence
#include <stdio.h>
void main()
{
int i, n, t1 = 0, t2 = 1, nextTerm;
clrscr();
printf("Enter the number of terms: ");
scanf("%d", &n);
printf("Fibonacci Series: ");
for (i = 1; i <= n; ++i)
{
printf("%d, ", t1);
nextTerm = t1 + t2;
t1 = t2;
t2 = nextTerm;
}
getch();
}
//find enter no. is palindrome or not
#include <stdio.h>
void main()
{
int n, reversedInteger = 0, remainder, originalInteger;
clrscr();
printf("Enter an integer: ");
scanf("%d", &n);
originalInteger = n;
while( n!=0 )
{
remainder = n%10;
reversedInteger = reversedInteger*10 + remainder;
n /= 10;
}
if (originalInteger == reversedInteger)
printf("%d is a palindrome.", originalInteger);
else
printf("%d is not a palindrome.", originalInteger);
getch();
}
//largest of n numbers
#include <stdio.h>
int main()
{
int i, n;
float arr[100];
printf("Enter total number of elements(1 to 100): ");
scanf("%d", &n);
printf("\n");
// Stores number entered by the user
for(i = 0; i < n; ++i)
{
printf("Enter Number %d: ", i+1);
scanf("%f", &arr[i]);
}
for(i = 1; i < n; ++i)
{
// Change < to > if you want to find the smallest element
if(arr[0] < arr[i])
arr[0] = arr[i];
}
printf("Largest element = %.2f", arr[0]);
return 0;
}
//arrange no. in ascending orders
#include <stdio.h>
#include <conio.h>
int main()
{
int a[10] = { 3,4,7,6,5,1,2,8,10,9 };
int n = 10;
printf("\n\nArray Data : ");
for (int i = 0; i < n; i++)
{
printf(" %d ", a[i]);
}
for (int i = 0; i < n; i++)
for (int j = 0; j < n; j++)
{
if (a[j] > a[i])
{
int tmp = a[i];
a[i] = a[j];
a[j] = tmp;
}
}
}
printf("\n\nAscending : ");
for (int i = 0; i < n; i++)
{
printf(" %d ", a[i]);
}
for (int i = 0; i < n; i++) //Loop for descending ordering
{
for (int j = 0; j < n; j++) //Loop for comparing other values
{
if (a[j] < a[i]) //Comparing other array elements
{
int tmp = a[i];
a[i] = a[j];
a[j] = tmp;
}
}
}
printf("\n\nDescending : ");
for (int i = 0; i < n; i++)
{
printf(" %d ", a[i]);
}
getch();
return 0;
}
Programs on arrays
//find sum of two matrix
#include <stdio.h>
int main()
{
int m, n, c, d, first[10][10], second[10][10], difference[10][10];
printf("Enter the number of rows and columns of matrix\n");
scanf("%d%d", &m, &n);
printf("Enter the elements of first matrix\n");
for (c = 0; c < m; c++)
for (d = 0 ; d < n; d++)
scanf("%d", &first[c][d]);
printf("Enter the elements of second matrix\n");
for (c = 0; c < m; c++)
for (d = 0; d < n; d++)
scanf("%d", &second[c][d]);
printf("Difference of entered matrices:-\n");
for (c = 0; c < m; c++) {
for (d = 0; d < n; d++) {
difference[c][d] = first[c][d] - second[c][d];
printf("%d\t",difference[c][d]);
}
printf("\n");
}
return 0;
}
//subtraction of two matrix
#include <stdio.h>
int main()
{
int m, n, c, d, first[10][10], second[10][10], difference[10][10];
printf("Enter the number of rows and columns of matrix\n");
scanf("%d%d", &m, &n);
printf("Enter the elements of first matrix\n");
for (c = 0; c < m; c++)
for (d = 0 ; d < n; d++)
scanf("%d", &first[c][d]);
printf("Enter the elements of second matrix\n");
for (c = 0; c < m; c++)
for (d = 0; d < n; d++)
scanf("%d", &second[c][d]);
printf("Difference of entered matrices:-\n");
for (c = 0; c < m; c++) {
for (d = 0; d < n; d++) {
difference[c][d] = first[c][d] - second[c][d];
printf("%d\t",difference[c][d]);
}
printf("\n");
}
return 0;
}
//matrix multiplication
#include <stdio.h>
int main()
{
int a[10][10], b[10][10], result[10][10], r1, c1, r2, c2, i, j, k;
printf("Enter rows and column for first matrix: ");
scanf("%d %d", &r1, &c1);
printf("Enter rows and column for second matrix: ");
scanf("%d %d",&r2, &c2);
while (c1 != r2)
{
printf("Error! column of first matrix not equal to row of second.\n\n");
printf("Enter rows and column for first matrix: ");
scanf("%d %d", &r1, &c1);
printf("Enter rows and column for second matrix: ");
scanf("%d %d",&r2, &c2);
}
printf("\nEnter elements of matrix 1:\n");
for(i=0; i<r1; ++i)
for(j=0; j<c1; ++j)
{
printf("Enter elements a%d%d: ",i+1, j+1);
scanf("%d", &a[i][j]);
}
printf("\nEnter elements of matrix 2:\n");
for(i=0; i<r2; ++i)
for(j=0; j<c2; ++j)
{
printf("Enter elements b%d%d: ",i+1, j+1);
scanf("%d",&b[i][j]);
}
for(i=0; i<r1; ++i)
for(j=0; j<c2; ++j)
{
result[i][j] = 0;
}
for(i=0; i<r1; ++i)
for(j=0; j<c2; ++j)
for(k=0; k<c1; ++k)
{
result[i][j]+=a[i][k]*b[k][j];
}
printf("\nOutput Matrix:\n");
for(i=0; i<r1; ++i)
for(j=0; j<c2; ++j)
{
printf("%d ", result[i][j]);
if(j == c2-1)
printf("\n\n");
}
return 0;
}
Program on function
//find factorial of a number
#include <stdio.h>
int factorial(int);
int main()
{
int num;
int result;
printf("Enter a number to find it's Factorial: ");
scanf("%d", &num);
if (num < 0)
{
printf("Factorial of negative number not possible\n");
}
else
{
result = factorial(num);
printf("The Factorial of %d is %d.\n", num, result);
}
return 0;
}
int factorial(int num)
{
if (num == 0 || num == 1)
{
return 1;
}
else
{
return(num * factorial(num - 1));}
// Program to find a factorial of a given number using function.
#include<stdio.h>
void main()
{
int fact,n;
int fact1(int n1);
clrscr();
printf("Enter the number\n");
scanf("%d",&n);
fact = fact1(n);
printf("Factorial of %d is %d",n,fact);
getch();
}
int fact1(int n1)
{
int f1 = 1,i;
for(i=1;i<=n1;i++)
f1 = f1 * i;
return f1;
}
Program on structure ,unions
//create a structure employee
#include <stdio.h>
struct employee{
char name[30];
int empId;
float salary;
};
int main()
{
struct employee emp;
printf("\nEnter details :\n");
printf("Name ?:"); gets(emp.name);
printf("ID ?:"); scanf("%d",&emp.empId);
printf("Salary ?:"); scanf("%f",&emp.salary);
printf("\nEntered detail is:");
printf("Name: %s" ,emp.name);
printf("Id: %d" ,emp.empId);
printf("Salary: %f\n",emp.salary);
return 0;
}
Program on Pointers
//addition
and subtraction of two numbers
#include
<stdio.h>
int
main()
{
int first, second, *p, *q, sum, sub;
printf("Enter two integers \n");
scanf("%d%d", &first,
&second);
p = &first;
q = &second;
sum = *p + *q;
sub = *p + *q;
printf("Sum of entered numbers =
%d\n",sum);
return 0;
}
Programs on String Manipulation
// Program on string
operations
#include<stdio.h>
#include<string.h>
void main()
{
int res;
char str1[20],str2[20];
clrscr();
printf("Enter the first string\n");
gets(str1);
printf("Enter the second string\n");
gets(str2);
if(strcmp(str1,str2)==0)
printf("Strings are equal\n");
else
printf("Strings are not equal\n");
strcat(str1,str2);
printf("Concatenated strings are %s \n",str1);
res = strlen(str1);
printf("The length of the string is %d\n",res);
strlwr(str1);
puts(str1);
printf("\n");
strupr(str1);
puts(str1);
strcpy(str2,str1);
puts(str2);
printf("%s",strchr(str1,'Y'));
getch();
}
Programs to read and write files
//read the contents on to
the file
#include<stdio.h>
void main()
{
FILE *fopen(),*fp;
int c;
clrscr();
fp=fopen("dev.txt","r");
c=getc(fp);
while(c!=EOF)
{
putchar(c);
c=getc(fp);
}
fclose(fp);
getch();
}
//append the contents on
to the file
#include<stdio.h>
void main()
{
FILE *fp;
fp=fopen("dave.txt","a");
fprintf(fp,"%s","\nTHIS
is an exampleof apending C FILE EXAMPLE");
fclose(fp);
}
//write the contents from
to the file
#include<stdio.h>
void main()
{
FILE *fp;
fp=fopen("dave.txt","w");
fprintf(fp,"%s","\nTHIS
is an exampleof apending C FILE EXAMPLE");
fclose(fp);
}
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