Programming for Problem Solving
1) Program to print message
#include<stdio.h>
void main()
{
puts("Hi Budding Engineers");
}OUTPUT:
Hi Budding Engineers
2) Program to print your address using puts
#include<stdio.h>
int main()
{
puts("My address:");
puts("H No. 121 Kehar Singh Nagar\nHaibowal,\nLudhiana,\n,\nPunjab,\nIndia.");
return 0;
}OUTPUT:
My address: H No. 891-D Model Town Extension, Libra Bus Service, Ludhiana, Punjab, India.
3) Program to find sum of two numbers:
#include <stdio.h>
int num1, num2;
void main(){
printf("Welcome to the program to add to nunber\n");
printf("Write the numbers to be added:\n");
scanf("%d %d", &num1 ,&num2);
printf("The sum of two number is:");
printf("%d",num1 + num2);
}OUTPUT:
Welcome to the program to add to nunber Write the numbers to be added: 35 65 The sum of two number is:100
4)Program to convert temperature degree celcius to degree Farenheit
include<stdio.h>
float temp_in_c, temp_in_f;
int main(){
printf("Welcome to the temperature converter\n");
printf("Please Enter the temperature in degree celsius:\n");
scanf("%f",&temp_in_c);
temp_in_f = (temp_in_c * 9)/5 + 32;
printf("%f",temp_in_f);
}OUTPUT:
Welcome to the temperature converter Please Enter the temperature in degree celcius: 34 93.199997
5)Program to find area and perimeter of circle
#include <stdio.h>
#define PI 3.14f
int main()
{
float rad,area, perm;
printf("Enter radius of circle: ");
scanf("%f",&rad);
area=PI*rad*rad;
perm=2*PI*rad;
printf("Area of circle: %f \nPerimeter of circle: %f\n",area,perm);
return 0;
}OUTPUT:
Enter radius of circle: 2.34 Area of circle: 17.193384 Perimeter of circle: 14.695200
6) Program to find factorial of a number
#include <stdio.h>
int d;
int num = 1;
int main(){
printf("Enter the number whose factorial to be found:\n");
scanf(" %d",&d);
for(d; d>0; d--){
num = num *d ;
}
printf(" The factorial is %d",num);
return 0;
}OUTPUT:
Enter the number whose factorial to be found: 8 The factorial is 40320
7)Program to swap a number without using two numbers:
#include <stdio.h>
int main()
{
int a, b;
printf("Input two integers (a & b) to swap\n");
scanf("%d%d", &a, &b);
a = a + b;
b = a - b;
a = a - b;
printf("a = %d\nb = %d\n",a,b);
return 0;
}OUTPUT:
Input two integers (a & b) to swap 4 6 a = 6 b = 4
8)Program to check if the Number is odd or even:
#include <stdio.h>
int num;
int main(){
printf("Please enter the number to check if it's even or odd");
scanf("%d",&num);
if (num%2 == 0)
printf("The number is Even:\n");
else
printf("The number id Odd");
}OUTPUT:
Please enter the number to check if it's even or odd: 56 The number is Even
9)Program to reverse a number
#include <stdio.h>
int x,num, rev = 0;
int main()
{ printf("Enter the number to be reversed: \n");
scanf("%d", &num);
while(num > 1){
x = num % 10;
rev = rev * 10 + x;
num = num / 10;
}
printf("The reversed number is : %d \n", rev);
return 0;
}OUTPUT:
Enter the number to be reversed: 789456 The reversed number is 654987
10)Program of FizzBuzz:
#include<stdio.h>
int num;
int main(){
printf("Welcome to the Fizz Buzz Program");
printf("Enter The number");
scanf("%d",&num);
if (num%3 == 0 && num%5 !=0)
printf("Fizz");
if (num%3 != 0 && num%5 == 0)
printf("Buzz");
if (num%3 == 0 && num%5 == 0)
printf("FizzBuzz");
}OUTPUT:
Welcome to the Fizz Buzz Program Enter The number:45 FizzBuzz
11)Program to show days of week using Switch Case:
#include <stdio.h>
int main()
{
int week;
/* Input week number from user */
printf("Enter week number(1-7): ");
scanf("%d", &week);
switch(week)
{
case 1:
printf("Monday");
break;
case 2:
printf("Tuesday");
break;
case 3:
printf("Wednesday");
break;
case 4:
printf("Thursday");
break;
case 5:
printf("Friday");
break;
case 6:
printf("Saturday");
break;
case 7:
printf("Sunday");
break;
default:
printf("Invalid input! Please enter week number between 1-7.");
}
return 0;
}OUTPUT:
Enter week number(1-7): 3 Wednesday
12) Program to Check if a number is Prime
#include<stdio.h>
void main()
{
int num,sum=0;
printf("enter the number which you want check to wheather prime or not\n");
scanf("%d",&num);
if(num==1)
printf("number is neither prime nor composite\n");
else if(num<1)
printf("enter number greater than 1\n");
else
{
for(int i=2;i<n;i++)
{
if(n%i==0)
sum++;
}
if(sum==0)
printf("The number is prime\n");
else
printf("The number is composite\n");
}
}OUTPUT:
enter the number which you want check to wheather prime or not 71 The number is prime
13)Program to check if a number is Palindrome
#include<stdio.h>
int x,num, num_loop,rev= 0;
int main(){
printf("Welcome to the palindrome function\n");
printf("Enter the number:\n");
scanf("%d",&num);
num_loop = num;
while(num_loop > 1){
x = num_loop % 10;
rev = rev * 10 +x;
num_loop = num_loop/10;
}
if (rev == num)
printf("oh yes ! You wrote a palindrome number");
else
printf("sorry the number is not a palindrome");
}OUTPUT:
Welcome to the palindrome function Enter the number: 234565432 oh yes ! You wrote a palindrome number
14)Program to check a palindrome of Word
#include <stdio.h>
#include <string.h>
// A function to check if a string str is palindrome
void isPalindrome(char str[])
{
// Start from leftmost and rightmost corners of str
int l = 0;
int h = strlen(str) - 1;
// Keep comparing characters while they are same
while (h > l)
{
if (str[l++] != str[h--])
{
printf("%s is Not Palindrome", str);
return;
}
}
printf("%s is palindrome", str);
}
// Driver program to test above function
int main()
{
isPalindrome("abba");
isPalindrome("abbccbba");
isPalindrome("geeks");
return 0;
}OUTPUT:
abba is palindrome abbccbba is palindrome geeks is Not Palindrome
15)Program to print fibonacci series
#include<stdio.h>
int a,b,c,i;
int main(){
printf("Enter the first number of the series");
scanf("%d",&a);
printf("Enter the second number");
scanf("%d",&b);
for(i=0;i<20;i++){
c = a+b;
printf("%d\n",c);
a = b;
b = c;
}
}OUTPUT:
Enter the first number of the series5 Enter the second number6 11 17 28 45 73 118 191 309 500 809 1309 2118 3427 5545 8972 14517 23489 38006 61495 99501
16)Program to Enter and Display Elements of 1D Array:
#include <stdio.h>
int main()
{
int array[100], position, c, n, value;
printf("Enter number of elements in array\n");
scanf("%d", &n);
printf("Enter %d elements\n", n);
for (c = 0; c < n; c++)
scanf("%d", &array[c]);
printf("Enter the location where you wish to insert an element\n");
scanf("%d", &position);
printf("Enter the value to insert\n");
scanf("%d", &value);
for (c = n - 1; c >= position - 1; c--)
array[c+1] = array[c];
array[position-1] = value;
printf("Resultant array is\n");
for (c = 0; c <= n; c++)
printf("%d\n", array[c]);
return 0;
}
OUTPUT:
Input 10 elements in the array : element - 0 : 1 element - 1 : 1 element - 2 : 2 element - 3 : 3 element - 4 : 4 element - 5 : 5 element - 6 : 6 element - 7 : 7 element - 8 : 8 element - 9 : 9 Elements in array are: 1 1 2 3 4 5 6 7 8 9
17)Program to Enter and Display Elements of 2D Array
#include<stdio.h>
int main(){
/* 2D array declaration*/
int disp[2][3];
/*Counter variables for the loop*/
int i, j;
for(i=0; i<2; i++) {
for(j=0;j<3;j++) {
printf("Enter value for disp[%d][%d]:", i, j);
scanf("%d", &disp[i][j]);
}
}
//Displaying array elements
printf("Two Dimensional array elements:\n");
for(i=0; i<2; i++) {
for(j=0;j<3;j++) {
printf("%d ", disp[i][j]);
if(j==2){
printf("\n");
}
}
}
return 0;
}OUTPUT:
Enter value for disp[0][0]:1 Enter value for disp[0][1]:2 Enter value for disp[0][2]:3 Enter value for disp[1][0]:4 Enter value for disp[1][1]:5 Enter value for disp[1][2]:6 Two Dimensional array elements: 1 2 3 4 5 6
18) Program to add to Matrix:
#include<stdio.h>
int a[3][3], b[3][3],c[3][3], i ,j;
int main(){
printf("Welcome to the Matrix Program");
printf("Enter the value of matrix A");
for(i=0;i<3;i++){
for(j=0;j<3;j++){
scanf("%d",&a[i][j]);
}}
printf("Enter the value of matrix B");
for(i=0;i<3;i++){
for(j=0;j<3;j++){
scanf("%d",&b[i][j]);
}}
printf("You have entered all the values of the matrix\n");
printf("Now the program is displaying the addition of matrix");
for(i=0;i<3;i++){
for(j=0;j<3;j++){
c[i][j] = b[i][j] + a[i][j];
}}
for(i=0;i<3;i++){
for(j=0;j<3;j++){
printf("%d\t",c[i][j]);
}
printf("\n");}
}OUTPUT:
Welcome to the Matrix ProgramEnter the value of matrix A 23 67 12 89 23 78 12 65 23 Enter the value of matrix B45 67 89 23 62 48 69 52 84 You have entered all the values of the matrix Now the program is displaying the addition of matrix 68 134 101 112 85 126 81 117 107
19)Program to Display Transpose of Matrix:
#include<stdio.h>
int a[3][3],c[3][3], i ,j;
int main(){
printf("Welcome to the Matrix Transpose Program");
printf("Enter the value of matrix");
for(i=0;i<3;i++){
for(j=0;j<3;j++){
scanf("%d",&a[i][j]);
}}
for(i=0;i<3;i++){
for(j=0;j<3;j++){
printf("%d\t",a[i][j]);
}
printf("You have entered all the values of the matrix\n");
printf("Now the program is displaying the transpose of matrix\n");
for(i=0;i<3;i++){
for(j=0;j<3;j++){
c[j][i] = a[i][j];
}}
for(i=0;i<3;i++){
for(j=0;j<3;j++){
printf("%d\t",c[i][j]);
}
printf("\n");}
}
}OUTPUT:
Welcome to the Matrix Transpose ProgramEnter the value of matrix34 34 56 625 536 75 68 97 07 You have entered all the values of the matrix Now the program is displaying the transpose of matrix 34 625 68 34 536 97 56 75 7
20)Program for Subtraction of 2 Matrix:
#include<stdio.h>
int a[3][3], b[3][3],c[3][3], i ,j;
int main(){
printf("Welcome to the Matrix Program");
printf("Enter the value of matrix A");
for(i=0;i<3;i++){
for(j=0;j<3;j++){
scanf("%d",&a[i][j]);
}}
printf("Enter the value of matrix B");
for(i=0;i<3;i++){
for(j=0;j<3;j++){
scanf("%d",&b[i][j]);
}}
printf("You have entered all the values of the matrix\n");
printf("Now the program is displaying the addition of matrix");
for(i=0;i<3;i++){
for(j=0;j<3;j++){
c[i][j] = b[i][j] - a[i][j];
}}
for(i=0;i<3;i++){
for(j=0;j<3;j++){
printf("%d\t",c[i][j]);
}
printf("\n");}
}OUTPUT:
Welcome to the Matrix ProgramEnter the value of matrix A 34 26 73 84 53 15 73 86 24 Enter the value of matrix B 1 57 43 57 33 10 24 46 13 You have entered all the values of the matrix Now the program is displaying the addition of matrix-33 31 -30 -27 -20 -5 -49 -40 -11
21)Program to Find Multiplication of Matrix
#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);
// Column of first matrix should be equal to column of second matrix and
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);
}
// Storing elements of first matrix.
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]);
}
// Storing elements of second matrix.
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]);
}
// Initializing all elements of result matrix to 0
for(i=0; i<r1; ++i)
for(j=0; j<c2; ++j)
{
result[i][j] = 0;
}
// Multiplying matrices a and b and
// storing result in result matrix
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];
}
// Displaying the result
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;
}OUTPUT:
Enter rows and column for first matrix: 3 2 Enter rows and column for second matrix: 3 2 Error! column of first matrix not equal to row of second.
Enter rows and column for first matrix: 2 3 Enter rows and column for second matrix: 3 2
Enter elements of matrix 1: Enter elements a11: 3 Enter elements a12: -2 Enter elements a13: 5 Enter elements a21: 3 Enter elements a22: 0 Enter elements a23: 4
Enter elements of matrix 2: Enter elements b11: 2 Enter elements b12: 3 Enter elements b21: -9 Enter elements b22: 0 Enter elements b31: 0 Enter elements b32: 4
Output Matrix: 24 29
6 25
22)Program to find square of a number using function
#include <stdio.h>
int num,a;
int square(int num);
void main(){
printf("Welcome to the program to find the square of a number\n");
printf("Input the number you want to print:\n")
scanf("%d", &num);
square(num);
}
int square(int a)
{
printf("The Answer is :%d\n",a*a);
}OUTPUT:
Welcome to the program to find the square of a number Input the number you want to find square of: 3 The Answer is:9
23)Program to swap two numbers by call by value
#include<stdio.h>
void swap(int a,int b);
void main()
{
int x,y;
printf("\n Enter value for x:");
scanf("%d",&x);
printf("\n Enter value for y:");
scanf("%d",&y);
printf("\n Before calling swap functin\n");
printf("\n Value of x=%d,Value of y=%d\n",x,y);
swap(x,y);
printf("\n After returning from swap function");
printf("\n Value of x=%d,value of y=%d\n",x,y);
}
void swap(int a,int b)
{
int temp;
printf("\n Inside the function \n");
printf("\n Value of a=%d,Value of b=%d before swaping\n",a,b);
temp=a;
a=b;
b=temp;
printf("\n Value of a=%d,Value of b=%d after swaping\n",a,b);
}OUTPUT:
Enter value for x:45
Enter value for y:56
Before calling swap functin
Value of x=45,Value of y=56
Inside the function
Value of a=45,Value of b=56 before swaping
Value of a=56,Value of b=45 after swaping
After returning from swap function Value of x=45,value of y=56
24)Program to swap two numbers by call by reference
#include<stdio.h>
void swap(int *,int *);
void main()
{
int x,y;
printf("\n Enter value for x:");
scanf("%d",&x);
printf("\n Enter value for y:");
scanf("%d",&y);
printf("\n Before calling swap functin\n");
printf("\n Value of x=%d,Value of y=%d\n",x,y);
swap(&x,&y);
printf("\n After returning from swap function");
printf("\n Value of x=%d,value of y=%d\n",x,y);
}
void swap(int *a,int *b)
{
int temp;
printf("\n Inside the function \n");
printf("\n Value of a=%d,Value of b=%d before swaping\n",*a,*b);
temp=*a;
*a=*b;
*b=temp;
printf("\n Value of a=%d,Value of b=%d after swaping\n",*a,*b);
}OUTPUT:
Enter value for x:23
Enter value for y:45
Before calling swap functin
Value of x=23,Value of y=45
Inside the function
Value of a=23,Value of b=45 before swaping
Value of a=45,Value of b=23 after swaping
After returning from swap function Value of x=45,value of y=23
25)Program to Find factorial of a number using recursion:
#include <stdio.h>
int count = 1, num;
int multiply(int num);
int main(){
printf("Welcome to the program to find factorial by recursion");
printf("Write the number:\n");
scanf("%d",&num);
multiply(num);
printf("The facorial is %d",count);
}
int multiply(int num){
count = count * num;
if(num>1){
multiply(num - 1);
}
return count;}OUTPUT:
Welcome to the program to find factorial by recursionWrite the number: 8 The facorial is 40320
26)Program to Find fibonacci series using recursion:
#include <stdio.h>
int count, num1, num2, b;
int add(int num1,OUTPUT:
Welcome to the program to write the fibonacci series by recursion Write the first and second number of the series 2 3 How many terms you want in the fibonacci series 20 The fibonacci series is 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 6765 10946 17711
27)Program to add elements to a structure and display them
#include <stdio.h>
struct student
{
char name[50];
int roll;
float marks;
} s[10];
int main()
{
int i;
printf("Enter information of students:\n");
// storing information
for(i=0; i<10; ++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");
// displaying information
for(i=0; i<10; ++i)
{
printf("\nRoll number: %d\n",i+1);
printf("Name: ");
puts(s[i].name);
printf("Marks: %.1f",s[i].marks);
printf("\n");
}
return 0;
}
OUTPUT:
Enter information of students:
For roll number1, Enter name: Tom Enter marks: 98
For roll number2, Enter name: Jerry Enter marks: 89 . . . Displaying Information: Roll number: 1 Name: Tom Marks: 98 . . .
28)Pointer or variable
#include <stdio.h>
int main () {
int var = 20; /* actual variable declaration */
int *ip; /* pointer variable declaration */
ip = &var; /* store address of var in pointer variable*/
printf("Address of var variable: %x\n", &var );
/* address stored in pointer variable */
printf("Address stored in ip variable: %x\n", ip );
/* access the value using the pointer */
printf("Value of *ip variable: %d\n", *ip );
return 0;
}OUTPUT
Address of var variable: bffd8b3c Address stored in ip variable: bffd8b3c Value of *ip variable: 20