/* Program to print your name */
#include<stdio.h>
int main() {
puts("~~~~~~~~~~~~~~");
puts("Rishab");
puts("~~~~~~~~~~~~~~");
return 0;
}
/* College Address */
#include<stdio.h>
int main() {
printf("\n\t\t\t -Guru Nanak Dev Engineering College,");
printf("\n\t\t\t -Gill Road,");
printf("\n\t\t\t -Ludhiana , Punjab\n");
return 0;
}
/* To add two integers */
#include <stdio.h>
int main() {
int a,b;
printf("\nEnter the numbers....");
printf("\nA:");
scanf("%d",&a);
printf("\nB:");
scanf("%d",&b);
a=a+b;
printf("\n Sum of the number is %d \n",a);
return 0;
}
/* To find quotient and remainder */
#include <stdio.h>
int main() {
int a,b,r,q;
printf("\nEnter the Dividend: ");
scanf("%d",&a);
printf("\nEnter the divisor: ");
scanf("%d",&b);
r=a%b;
q=a/b;
printf("\nRemainder: %d",r);
printf("\nQuotient: %d \n",q);
return 0;
}
/* Swapping without 3rd variable */
#include <stdio.h>
int main() {
int a,b;
printf("Enter the value of A: ");
scanf("%d",&a);
printf("Enter the value of B: ");
scanf("%d",&b);
a = a + b;
b = a - b;
a = a - b;
printf("\nA: %d",a);
printf("\nB: %d"\n,b);
return 0;
}
/* To find whether number is even or odd */
#include<stdio.h>
int main() {
int num;
printf("Enter the Number:");
scanf("%d",&num);
if(num%2==0)
printf("\nNumber is Even");
else
printf("\nNumber is Odd\n");
printf("\n");
return 0;
}
/* Largest one in two */
#include<stdio.h>
int main() {
int a,b;
printf("Enter any two number(A and B): ");
scanf("%d%d", &a,&b);
if(a>b)
printf("\nA is largest");
else
printf("\nB is largest\n");
return 0;
}
/* Largest of three number */
#include<stdio.h>
int main() {
int x, y, z, large;
printf(" Enter any three integer numbers for x, y, z : ") ;
scanf("%d %d %d", &x, &y, &z) ;
large = (x > y ? ( x > z ? x : z) : (y > z ? y : z)) ;
printf("\n\n Largest or biggest or greatest or maximum among 3 numbers using Conditional ternary Operator : %d", large) ;
return 0;
}
/* To find grade of a student by marks */
#include<stdio.h>
int main() {
int s1,s2,s3,s4,s5,agg;
float perc;
printf("Enter the Marks in 5 Subjects Respectively:\n");
scanf("%d%d%d%d%d",&s1,&s2,&s3,&s4,&s5);
agg=s1+s2+s3+s4+s5; // Aggregate Marks
perc=agg/500.0*100; // Perc Marks
if(perc>=90)
{
printf("\nA\n");
}
else if (perc>=80 && perc<90)
{
printf("\nB\n");
}
else if(perc>=70 && perc<80)
{
printf("\nC\n");
}
else if(perc>=60 && perc<70)
{
printf("\nD\n");
}
else if(perc>=50 && perc<60)
{
printf("\nE\n");
}
else
{
printf("\nScope of Improvement\n");
}
return 0;
}
/*Program to print roots */
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main() {
float a, b, c, root1, root2;
float realp, imagp, disc;
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);
}
}
return 0;
}/* To find whether year is leap or not */
#include<stdio.h>
int main() {
int year,temp;
printf("Enter teh year: ");
scanf("%d",&year);
temp=year%4;
if(year%100==0)
{
if(year%400==0)
printf("\nLeap year...");
}
else
{
if(year%4==0)
printf("\nLeap year\n");
else
printf("\nNot a Leap year\n");
}
return 0;
}
/* Table of 5 */
#include<stdio.h>
int main() {
int i,res;
for(i=0;i<=10;i++) {
res = 5*i;
printf("5 X %d = %d\n",i,res);
}
return 0;
}
/* C Program to Create Simple Calculator using Switch Case */
#include <stdio.h>
int main() {
char Operator;
float num1, num2, result = 0;
printf("\n Please Enter an Operator (+, -, *, /) : ");
scanf("%c", &Operator);
printf("\n Please Enter the Values for two Operands: num1 and num2 : ");
scanf("%f%f", &num1, &num2);
switch(Operator)
{
case '+':
result = num1 + num2;
break;
case '-':
result = num1 - num2;
break;
case '*':
result = num1 * num2;
break;
case '/':
result = num1 / num2;
break;
default:
printf("\n You have enetered an Invalid Operator ");
}
printf("\n The result of %.2f %c %.2f = %.2f\n", num1, Operator, num2, result);
return 0;
}
/* To find reverse of a Number*/
#include<stdio.h>
int main() {
int num,rev=0;
printf("\nEnter the Number:");
scanf("%ld",&num);
while(num!=0)
{
rev = rev * 10;
rev = rev + num%10;
num = num/10;
}
printf("\nReversed number:%d\n",rev);
printf("\n\n");
return 0;
}
/* Palindrome */
#include<stdio.h>
int main() {
int n,rev=0,check,rem;
printf("\nEnter the number:");
scanf("%d",&n);
check=n;
while( n!=0 )
{
rem = n%10;
rev = rev*10 + rem;
n /= 10;
}
if(rev==check)
printf("\nNumber is a Pallindrome\n");
else
printf("\nNumber is not a Pallindrome\n");
printf("\n\n");
return 0;
}
/* Program to check prime no. */
#include <stdio.h>
#include <stdlib.h>
int main() {
int num, j, flag;
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);
return 0;
}
/* Prime number from 1 to 100 */
#include<stdio.h>
int main(){
int numbr,k,remark;
printf(" The prime numbers between 1 and 100 : \n");
for(numbr=2;numbr<=100;++numbr)
{
remark=0;
for(k=2;k<=numbr/2;k++){
if((numbr % k) == 0){
remark++;
break;
}
}
if(remark==0)
printf("\n %d ",numbr);
}
return 0;
} 
/* To check armstrong number */
#include <stdio.h>
int main()
{
int number, originalNumber, remainder, result = 0;
printf("Enter a three digit integer: ");
scanf("%d", &number);
originalNumber = number;
while (originalNumber != 0)
{
remainder = originalNumber%10;
result += remainder*remainder*remainder;
originalNumber /= 10;
}
if(result == number)
printf("%d is an Armstrong number.\n",number);
else
printf("%d is not an Armstrong number\n.",number);
return 0;
}
#include <stdio.h>
int main() {
int i,j,r;
printf("Enter number of rows: ");
scanf("%d",&r);
for(i=1; i<=r; ++i)
{
for(j=1; j<=i; ++j)
{
printf("%d ",j);
}
printf("\n");
}
return 0;
}
#include <stdio.h>
int main() {
int r,i,j,num= 1;
printf("Enter number of rows: ");
scanf("%d",&r);
for(i=1;i<=r;i++)
{
for(j=1;j<=i;++j)
{
printf("%d",num);
++num;
}
printf("\n");
}
return 0;
}####Result:
/* Largest in 1 dimensional array */
#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]);
}
// Loop to store largest number to arr[0]
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;
}
/* Sum of N no.s in array */
#include<stdio.h>
int main() {
printf("\n\n\t\tStudytonight - Best place to learn\n\n\n");
int n, sum = 0, c, array[100];
printf("Enter the number of integers you want to add: ");
scanf("%d", &n);
printf("\n\nEnter %d integers \n\n", n);
for(c = 0; c < n; c++)
{
scanf("%d", &array[c]);
sum += array[c]; // same as sum = sum + array[c]
}
printf("\n\nSum = %d\n\n", sum);
return 0;
}
/* Addition of matrix */
#include <stdio.h>
int main(){
int r, c, a[100][100], b[100][100], sum[100][100], i, j;
printf("Enter number of rows (between 1 and 100): ");
scanf("%d", &r);
printf("Enter number of columns (between 1 and 100): ");
scanf("%d", &c);
printf("\nEnter elements of 1st matrix:\n");
for(i=0; i<r; ++i)
for(j=0; j<c; ++j)
{
printf("Enter element a%d%d: ",i+1,j+1);
scanf("%d",&a[i][j]);
}
printf("Enter elements of 2nd matrix:\n");
for(i=0; i<r; ++i)
for(j=0; j<c; ++j)
{
printf("Enter element a%d%d: ",i+1, j+1);
scanf("%d", &b[i][j]);
}
// Adding Two matrices
for(i=0;i<r;++i)
for(j=0;j<c;++j)
{
sum[i][j]=a[i][j]+b[i][j];
}
// Displaying the result
printf("\nSum of two matrices: \n");
for(i=0;i<r;++i)
for(j=0;j<c;++j)
{
printf("%d ",sum[i][j]);
if(j==c-1)
{
printf("\n\n");
}
}
return 0;
}
/* Multiplation of matrices */
#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;
}
#include<stdio.h>
#include <string.h>
int main() {
char s[1000];
int i,n,c=0;
printf("Enter the string : ");
gets(s);
n=strlen(s);
for(i=0;i<n/2;i++)
{
if(s[i]==s[n-i-1])
c++;
}
if(c==i)
printf("string is palindrome\n");
else
printf("string is not palindrome\n");
return 0;
}
25) Program to perform basic operations like lenghth of string ,string concat, string copy ,string compare and string reverse.
/*Fundamental string operation, lenth, concatenation, compare and copy strings without string.h */
#include <stdio.h>
#include <stdlib.h>
int find_length(char string[]) {
int len = 0, i;
for (i = 0; string[i] != '\0'; i++) {
len++;
}
return len;
}
void join_strings(char string1[], char string2[]) {
int i, len1, len2;
len1 = find_length(string1);
len2 = find_length(string2);
for (i = len1; i < len1 + len2; i++) {
string1[i] = string2[i - len1];
}
string1[i] = '\0'; //adding null character at the end of input
}
/*returns 0 if thery are same otherwise returns 1*/
int compare_strings(char string1[], char string2[]) {
int len1, len2, i, count = 0;
len1 = find_length(string1);
len2 = find_length(string2);
if (len1 != len2)
return 1;
for (i = 0; i < len1; i++) {
if (string1[i] == string2[i])
count++;
}
if (count == len1)
return 0;
return 1;
}
void copy_string(char destination[], char source[]) {
int len, i;
len = find_length(source);
for (i = 0; i < len; i++) {
destination[i] = source[i];
}
destination[i] = '\0';
}
int main() {
char string1[20], string2[20]; //string variables declaration with size 20
int choice;
while (1) {
printf("\n1. Find Length \n2. Concatenate \n3. Compare \n4. Copy \n5. Exit\n");
printf("Enter your choice: ");
scanf("%d", & choice);
switch (choice) {
case 1:
printf("Enter the string: ");
scanf("%s", string1);
printf("The length of string is %d", find_length(string1));
break;
case 2:
printf("Enter two strings: ");
scanf("%s%s", string1, string2);
join_strings(string1, string2);
printf("The concatenated string is %s", string1);
break;
case 3:
printf("Enter two strings: ");
scanf("%s%s", string1, string2);
if (compare_strings(string1, string2) == 0) {
printf("They are equal");
} else {
printf("They are not equal");
}
break;
case 4:
printf("Enter a string: ");
scanf("%s", string1);
printf("String1 = %s\n");
printf("After copying string1 to string 2\n");
copy_string(string2, string1);
printf("String2 = %s", string2);
break;
case 5:
exit(0);
}
}
return 0;
}
/* Call by reference */
#include <stdio.h>
void swap(int*, int*);
int main() {
int x, y;
printf("Enter the value of x and y\n");
scanf("%d%d",&x,&y);
printf("Before Swapping\nx = %d\ny = %d\n", x, y);
swap(&x, &y);
printf("After Swapping\nx = %d\ny = %d\n", x, y);
return 0;
}
void swap(int *a, int *b)
{
int temp;
temp = *b;
*b = *a;
*a = temp;
}/* Call by value */
#include <stdio.h>
void swap(int, int);
int main() {
int x, y;
printf("Enter the value of x and y\n");
scanf("%d%d",&x,&y);
printf("Before Swapping\nx = %d\ny = %d\n", x, y);
swap(x, y);
printf("After Swapping\nx = %d\ny = %d\n", x, y);
return 0;
}
void swap(int a, int b) {
int temp;
temp = b;
b = a;
a = temp;
printf("Values of a and b is %d %d\n",a,b);
}/* Recursion */
#include<stdio.h>
long int multiplyNumbers(int n);
int main() {
int n;
printf("Enter a positive integer: ");
scanf("%d", &n);
printf("Factorial of %d = %ld\n", n, multiplyNumbers(n));
return 0;
}
long int multiplyNumbers(int n)
{
if (n >= 1)
return n*multiplyNumbers(n-1);
else
return 1;
}
/* Without recrsion: */
#include <stdio.h>
int main() {
int c, n, fact = 1;
printf("Enter a number to calculate its factorial\n");
scanf("%d", &n);
for (c = 1; c <= n; c++)
fact = fact * c;
printf("Factorial of %d = %d\n", n, fact);
return 0;
}
/* Program to print fibonaci series with recursion */
#include<stdio.h>
void series(int); //prototype
int main() {
int n;
printf("\n\nEnter the number of terms you wish: ");
scanf("%d",&n);
printf("\n\n");
series(n); // function call
printf("\n\n\n");
return 0;
}
void series(int n) // definition
{
int t1=0,t2=1,next;
for(int i=0;i<=n;i++)
{
printf("%d\n",t1);
next=t1+t2;
t1=t2;
t2=next;
}
}
// Fibonaci series without recursion:-
#include <stdio.h>
int fibo(int);
int main() {
int num;
int result;
printf("Enter the nth number in fibonacci series: ");
scanf("%d", &num);
if (num < 0)
{
printf("Fibonacci of negative number is not possible.\n");
}
else
{
result = fibo(num);
printf("The %d number in fibonacci series is %d\n", num, result);
}
return 0;
}
int fibo(int num)
{
if (num == 0)
{
return 0;
}
else if (num == 1)
{
return 1;
}
else
{
return(fibo(num - 1) + fibo(num - 2));
}
}
/* program to find average of 5 numbers */
#include<stdio.h>
int avg(int,int,int,int,int); // prototype
int main() { int a1,a2,a3,a4,a5,res;
printf("\nEnter the numbers respectiively....");
scanf("%d%d%d%d%d",&a1,&a2,&a3,&a4,&a5);
res=avg(a1,a2,a3,a4,a5); // function call
printf("Average of the numbers %d",res);
return 0;
}
int avg(int a1,int a2,int a3,int a4,int a5) // definition
{ int p;
p=(a1+a2+a3+a4+a5)/5;
return p;
}
/* Linear Search */
#include <stdio.h>
int main()
{
int array[100], search, c, n;
printf("Enter number of elements in array\n");
scanf("%d", &n);
printf("Enter %d integer(s)\n", n);
for (c = 0; c < n; c++)
scanf("%d", &array[c]);
printf("Enter a number to search\n");
scanf("%d", &search);
for (c = 0; c < n; c++)
{
if (array[c] == search)
{
printf("%d is present at location %d.\n", search, c+1);
break;
}
}
if (c == n)
printf("%d isn't present in the array.\n", search);
return 0;
}
/* Binary Search */
#include <stdio.h>
int main()
{
int c, first, last, middle, n, search, array[100];
printf("Enter number of elements\n");
scanf("%d",&n);
printf("Enter %d integers\n", n);
for (c = 0; c < n; c++)
scanf("%d",&array[c]);
printf("Enter value to find\n");
scanf("%d", &search);
first = 0;
last = n - 1;
middle = (first+last)/2;
while (first <= last) {
if (array[middle] < search)
first = middle + 1;
else if (array[middle] == search) {
printf("%d found at location %d.\n", search, middle+1);
break;
}
else
last = middle - 1;
middle = (first + last)/2;
}
if (first > last)
printf("Not found! %d isn't present in the list.\n", search);
return 0;
}
#include <stdio.h>
int main()
{
int array[100], n, c, d, swap;
printf("Enter number of elements\n");
scanf("%d", &n);
printf("Enter %d integers\n", n);
for (c = 0; c < n; c++)
scanf("%d", &array[c]);
for (c = 0 ; c < n - 1; c++)
{
for (d = 0 ; d < n - c - 1; d++)
{
if (array[d] > array[d+1])
{
swap = array[d];
array[d] = array[d+1];
array[d+1] = swap;
}
}
}
printf("Sorted list in ascending order:\n");
for (c = 0; c < n; c++)
printf("%d\n", array[c]);
return 0;
}
/* Structures for student */
#include <stdio.h>
struct student
{
char name[50];
int roll;
float marks;
} s[10];
int main()
{
int i;
printf("Enter information of students:\n");
for(i=0; i<3; ++i)
{
s[i].roll = i+1;
printf("\nFor roll number%d,\n",s[i].roll);
printf("Enter name: ");
scanf("%s",s[i].name);
printf("Enter marks: ");
scanf("%f",&s[i].marks);
printf("\n");
}
printf("Displaying Information:\n\n");
for(i=0; i<3; ++i)
{
printf("\nRoll number: %d\n",i+1);
printf("Name: ");
puts(s[i].name);
printf("Marks: %.1f",s[i].marks);
printf("\n");
}
return 0;
}
#include <stdio.h>
int main()
{
int a[10][10], transpose[10][10], r, c, i, j;
printf("Enter rows and columns of matrix: ");
scanf("%d %d", &r, &c);
// Storing elements of the matrix
printf("\nEnter elements of matrix:\n");
for(i=0; i<r; ++i)
for(j=0; j<c; ++j)
{
printf("Enter element a%d%d: ",i+1, j+1);
scanf("%d", &a[i][j]);
}
// Displaying the matrix a[][] */
printf("\nEntered Matrix: \n");
for(i=0; i<r; ++i)
for(j=0; j<c; ++j)
{
printf("%d ", a[i][j]);
if (j == c-1)
printf("\n\n");
}
// Finding the transpose of matrix a
for(i=0; i<r; ++i)
for(j=0; j<c; ++j)
{
transpose[j][i] = a[i][j];
}
// Displaying the transpose of matrix a
printf("\nTranspose of Matrix:\n");
for(i=0; i<c; ++i)
for(j=0; j<r; ++j)
{
printf("%d ",transpose[i][j]);
if(j==r-1)
printf("\n\n");
}
return 0;
}
#include <stdio.h>
int main() {
int a;
int *pt;
a = 10;
pt = &a;
printf("\n[&a ]:Address of A = %p", &a);
return 0;
}
#include <stdio.h>
int main()
{
int data[5],i;
printf("Enter elements: ");
for(i = 0; i < 5; ++i)
scanf("%d", data + i);
printf("You entered: \n");
for(i = 0; i < 5; ++i)
printf("%d\n", *(data + i));
return 0;
}