#include<stdio.h>
#include<string.h>
int main()
{
char str1[20];
int i, j, count=0, prove=0;
printf("\nEnter any string: ");
gets(str1);
for (i=0; str1[i]!='\0'; i++)
{
count++;
}
for(i=0,j=count-1;i<count-1;i++,j--)
{
if (str1[i] != str1[j])
{
prove = 1;
break;
}
}
if (prove == 0)
printf("\nString is palindrome");
else
printf("\nString is not palindrome");
return 0;
}
output:
#include <stdio.h>
#include <string.h>
int main ()
{
int c = 0;
char ch, s[1000];
printf("Input a string\n");
gets(s);
for(c=0;s[c] != '\0';c++) {
ch = s[c];
if (ch >= 'A' && ch <= 'Z')
s[c] = s[c] + 32;
else if (ch >= 'a' && ch <= 'z')
s[c] = s[c] - 32;
}
printf("%s\n", s);
return 0;
}
#include <stdio.h>
#include <string.h>
int main()
{
char a[100],b[100];
while(1){
printf("Enter the string to check if it is a palindrome:");
scanf("%s",a);
strcpy(b,a);
strrev(b);
if (strcmp(a,b) == 0)
{
printf("Entered string is a palindrome.\n");
}
else
{
printf("Entered string is not a palindrome.\n");
break;
}
}
return 0;
}
#include <stdio.h>
#include<string.h>
int main()
{
char s1[100], s2[100], i, j;
printf("Enter first string: ");
scanf("%s",s1);
printf("Enter second string: ");
scanf("%s",s2);
for(i=0; s1[i]!='\0'; i++);
for(j=0; s1[i]+s2[j]!='\0';i++,j++)
{
s1[i]=s2[j];
}
s1[i]='\0';
printf("After concatenation: %s",s1);
return 0;
}
#include <stdio.h>
#include <string.h>
int main()
{
char str1[100], str2[100], i;
printf("\n");
printf("input string : ");
scanf("%s",str1);
for(i=0; str1[i]!='\0';i++)
{
str2[i]=str1[i];
}
str2[i]='\0';
printf("\noutput String: %s\n",str2);
return 0;
}
#include<stdio.h>
#include<string.h>
int main()
{
char str[100],i,count=0;
printf("Enter a string: ");
scanf("%s",str);
for(i=0; str[i]!='\0'; i++){
count++;
}
printf("Length of string: %d",count);
return 0;
}
#include<stdio.h>
#include<string.h>
///reverse a sentence
int main()
{
int i,length,count=0;
char ch[20];
printf("Enter the string:");
gets(ch);
length=strlen(ch);
for(i=0; i<length; i++)
{
count++;
}
printf("Reverse is:");
for(i=count-1; i>=0; i--)
{
printf("%c",ch[i]);
}
return 0;
}
#include<stdio.h>
#include<string.h>
/***
///reverse a word
int main()
{
int i,count=0;
char ch[20];
printf("Enter the string:");
gets(ch);
for(i=0; ch[i]!='\0'; i++)
{
count++;
}
printf("Reverse is:");
for(i=count-1; i>=0; i--)
{
printf("%c",ch[i]);
}
return 0;
}
#include<stdio.h>
int Max(int arr[],int size);
int main(){
int arr[100],max,i,size;
printf("Enter the size of the array: ");
scanf("%d",&size);
printf("Enter %d elements of an array: ", size);
for(i=0;i<size;i++)
scanf("%d",&arr[i]);
max=Max(arr,size);
printf("Largest element of an array is: %d",max);
return 0;
}
int Max(int arr[],int size){
static int i=0,max =-99;
if( i<size){
if(max<arr[i])
max=arr[i];
i++;
Max(arr,size);
}
return max;
}
#include<stdio.h>
int isPrime(int num,int i);
int main(){
int num,prime;
printf("Enter a positive number: ");
scanf("%d",&num);
prime = isPrime(num,num/2);
if(prime==1)
printf("%d is a prime number",num);
else
printf("%d is not a prime number",num);
return 0;
}
int isPrime(int num,int i){
if(i==1){
return 1;
}else{
if(num%i==0)
return 0;
else
isPrime(num,i-1);
}
}
#include<stdio.h>
int multiply(int a,int b);
int main(){
int a,b,result;
printf("Enter two integer: ");
scanf("%d%d",&a,&b);
result = multiply(a,b);
printf("Multiplication of two integer is:%d",result);
return 0;
}
int multiply(int a,int b){
static int result=0,i=0;
if(i < a){
result= result + b;
i++;
multiply(a,b);
}
return result;
}
#include <stdio.h>
int gcd(int a,int b);
int main()
{
int a, b, result;
printf("Enter the two numbers to find their GCD: ");
scanf("%d%d", &a, &b);
result = gcd(a, b);
printf("The GCD of %d and %d is:%d\n", a, b, result);
}
int gcd(int a, int b)
{
while (a != b)
{
if (a > b)
{
return gcd(a - b, b);
}
else
{
return gcd(a, b - a);
}
}
return b; ///return a
}
#include<stdio.h>
int sum(int n);
int main()
{
int n,concat;
printf("Enter an positive integer: ");
scanf("%d",&n);
concat=sum(n);
printf("Sum = %d",concat);
return 0;
}
int sum(int n)
{
if(n!=0)
return n+sum(n-1);
}
#include<stdio.h>
int Lcm(int a,int b);
int main(){
int a,b,Lcm;
printf("Please Enter Two Number: ");
scanf("%d%d",&a,&b);
if(a>b)
Lcm = lcm(a,b);
else
Lcm = lcm(b,a);
printf("LCM of %d and %d is:%d",a,b,Lcm);
return 0;
}
int lcm(int a,int b){
static int temp = 1;
if(temp % a == 0 && temp % b == 0)
{
return temp;
}
temp++;
lcm(a,b);
}
#include<stdio.h>
int factorial(int n);
int main()
{
int n;
printf("Enter an positive integer: ");
scanf("%d",&n);
printf("%d! = %d", n, factorial(n));
return 0;
}
int factorial(int n)
{
if(n==1 || n==0){
return 1;
}
else if (n!=1)
return n*factorial(n-1);
}
#include <stdio.h>
#include <stdlib.h>
struct calculator{
int add1,add2,sub1,sub2,div1,div2,mul1,mul2;
};
void display(struct calculator pos);
int main()
{
struct calculator cal;
printf("\nplease enter tow number for addition:");
scanf("%d %d",&cal.add1,&cal.add2);
printf("\nplease enter tow number for subtraction:");
scanf("%d %d",&cal.sub1,&cal.sub2);
printf("\nplease enter tow number for division:");
scanf("%d %d",&cal.div1,&cal.div2);
printf("\nplease enter tow number for multiplication:");
scanf("%d %d",&cal.mul1,&cal.mul2);
display(cal);
return 0;
}
void display(struct calculator pos){
printf("\n-------------------------------------\n");
printf("THIS IS A SIMPLE CALCULATOR");
printf("\n-------------------------------------\n");
printf("ADDITION= %d\n",pos.add1+pos.add2);
printf("\nSUBTRACTION= %d\n",pos.sub1-pos.sub2);
printf("\nDIVISION= %d\n",pos.div1/pos.div2);
printf("\nMULTIPLICATION= %d\n",pos.mul1*pos.mul2);
printf("\n-------------------------------------\n");
printf("SOLVED");
printf("\n-------------------------------------\n");
}
#include <stdio.h>
pass_arr( int arr[])
{
int i;
for( i=0; i<7; i++)
{
printf("arr[%d] is: %d \n", i, arr[i]);
}
}
int main()
{
int arr[] = {11, 22, 33, 44, 55, 66, 77};
pass_arr(arr);
return 0;
}
output:
arr[0] is: 11
arr[1] is: 22
arr[2] is: 33
arr[3] is: 44
arr[4] is: 55
arr[5] is: 66
arr[6] is: 77
#include <stdio.h>
#include <stdlib.h>
struct my_info
{
char name[10];
int age;
char home_town[10];
char school[10];
char college[10];
char versity[10];
char life_style[10];
};
void biodata(struct my_info bio);
int main()
{
struct my_info koushik;
printf("Please enter your name:");
scanf("%s",&koushik.name);
printf("Please enter your age:");
scanf("%d",&koushik.age);
printf("Please enter your home town:");
scanf("%s",&koushik.home_town);
printf("Please enter your school:");
scanf("%s",&koushik.school);
printf("Please enter your college name:");
scanf("%s",&koushik.college);
printf("Please enter your versity name:");
scanf("%s",&koushik.versity);
printf("Please enter your life_style:");
scanf("%s",&koushik.life_style);
biodata(koushik);
return 0;
}
void biodata(struct my_info bio)
{
printf("\n-------------------------------------\n");
printf("koushik ahamed kushal's biodata:");
printf("\n-------------------------------------\n");
printf("\nNAME:%s\n",bio.name);
printf("\nAGE:%d\n",bio.age);
printf("\nHOME TOWN:%s\n",bio.home_town);
printf("\nSCHOOL:%s\n",bio.school);
printf("\nCOLLEGE:%s\n",bio.college);
printf("\nUNIVERSITY:%s\n",bio.versity);
printf("\nLIFE-STYLE:%s\n",bio.life_style);
printf("\n-------------------------------------\n");
}
output type:
#include <stdio.h>
int main()
{
int i,n;
int arr[100];
printf("Enter number:");
scanf("%d",&n);
for(i=0;i<n;++i)
{
scanf("%d",(arr+i));
}
for(i=1;i<n;++i)
{
if(arr[0]<arr[i])
arr[0]=arr[i];
}
printf("Largest number is= %d",arr[0]);
return 0;
}
output:
Enter number:6
7 8 4 9 0 3
Largest number is = 9
#include <stdio.h>
void swap(int *a,int *b);
int main()
{
int num1=5,num2=10;
printf("Before swapping: num1=%d num2=%d",num1,num2);
swap(&num1,&num2);
printf("\n After swapping:num1=%d num2=%d",num1,num2);
return 0;
}
void swap(int *a,int *b)
{
int temp;
temp=*a;
*a=*b;
*b=temp;
}
output:
Before swapping: num1=5 num2=10
After swapping:num1=10 num2=5
#include <stdio.h>
int main()
{
int i,arr[5],sum=0;
printf("Enter 5 numbers:");
for(i=0;i<5;i++)
{
scanf("%d",(arr+i));
sum += *(arr+i);
}
printf("Sum=%d",sum);
return 0;
}
output:
3 4 5 6 7
Sum=25
#include <stdio.h>
int main()
{
int num=5;
printf("Value: %d\n",num);
printf("Address: %d\n",&num);
printf("Address:%u\n",&num);
return 0;
}
output:
Value: 5
Address: 2081809404
Address:2081809404
#include<stdio.h>
int main(){
int n1,n2,x,y,lcm,gcd;
printf("\nEnter two numbers:");
scanf("%d %d",&n1,&n2);
lcm=func1(n1,n2);
gcd=func2(n1,n2);
printf("L.C.M=%d G.C.D=%d",lcm,gcd);
return 0;
}
int func1(int n1,int n2){
int x,y;
x=n1,y=n2;
while(n1!=n2){
if(n1>n2)
n1=n1-n2;
else
n2=n2-n1;
}
return (x*y)/n1;
}
int func2(int n1,int n2){
int x,y;
x=n1,y=n2;
while(n1!=n2){
if(n1>n2)
n1=n1-n2;
else
n2=n2-n1;
}
return n1;
}
output:
#include <stdio.h>
int factorial(int n);
int main()
{
int fact;
printf("Please enter a number:");
scanf("%d", &fact);
printf("The factorial of %d is:%d",fact, factorial(fact));
return 0;
}
int factorial(int n)
{
int i;
int factorial = 1;
for (i = 1; i<= n; i++)
factorial = factorial * i;
return factorial;
}
#include<stdio.h>
int main()
{
int a,year;
year=leap_year(a);
if(((year%4==0)&&(year%100!=0))||(year%400==0))
printf("%d is a leap year",year);
else
printf("%d is not a leap year",year);
return 0;
}
int leap_year(int year)
{
printf("Enter any year: ");
scanf("%d",&year);
return year;
}
#include <stdio.h>
void prime(int num);
int main(){
int n;
printf("Please enter a number:");
scanf("%d",&n);
prime(n);
return 0;
}
void prime(int num){
int i;
for(i=2; i<=num-1; i++){
if(num%i==0){
printf("%d is not a prime number",num);
break;
}
}
if(num==i)
printf("%d is a prime number",num);
}
///another way
#include<stdio.h>
int prime(int a);
int main()
{
int num,i,n;
num=prime(n);
for(i=2; i<=num-1; i++)
{
if(num%i==0){
printf("%d is not a prime number",num);
break;
}
}
if(num==i)
printf("%d is a prime number",num);
return 0;
}
int prime(int a){
printf("Please enter a number:");
scanf("%d",&a);
return a;
}
#include<stdio.h>
int poo( int,int);
int main()
{
int add,power,base;
printf("please enter base and power:");
scanf("%d%d",&base,&power);
add=poo(base,power);
printf("the result is:%d",add);
return 0;
}
int poo( int b,int p)
{
int i,sum=1;
for(i=1; i<=p; i++)
{
sum=sum*b;
}
return(sum);
}
#include<stdio.h>
///pascal triangle
int fact(int num);
int main()
{
int row,i,j;
printf("Enter the no. of rows:");
scanf("%d",&row);
for(i=0; i<row; i++)
{
for(j=0; j<row-i-1; j++)
printf(" ");
for(j=0; j<=i; j++)
printf("%d ",fact(i)/(fact(j)*fact(i-j)));
printf("\n");
}
return 0;
}
int fact(int num)
{
int fact=1;
int i;
for(i=1; i<=num;i++)
{
fact=fact*i;
}
return fact;
}
output:
#include <stdio.h>
int main()
{
int n, i, c, a = 1;
printf("Enter the number of rows:");
scanf("%d", &n);
for (i = 1; i <= n; i++)
{
for (c = 1; c <= i; c++)
{
printf("%d ",a);
a++;
}
printf("\n");
}
return 0;
}
#include <stdio.h>
#include <string.h>
int main()
{
char first[100], second[100], temp[100];
printf("Enter the first string:");
gets(first);
printf("Enter the second string:");
gets(second);
printf("\nBefore Swapping:\n");
printf("First string: %s\n",first);
printf("Second string: %s\n\n",second);
strcpy(temp,first);
strcpy(first,second);
strcpy(second,temp);
printf("After Swapping:\n");
printf("First string: %s\n",first);
printf("Second string: %s\n",second);
return 0;
}
#include <stdio.h>
#include <stdlib.h>
#include<math.h>
int main()
{
int arr[5],i,square_root;
printf("Please enter a five number of an array:");
for(i=0; i<5; i++)
{
scanf("%d",&arr[i]);
}
printf("\nThe square if the stored array is:");
for(i=0; i<5; i++)
{
printf("%d ",arr[i]*arr[i]);
}
printf("\nThe square root of The array is:");
for(i=0; i<5; i++)
{
square_root= sqrt(arr[i]*arr[i]);
printf("%d ",square_root);
}
return 0;
}
#include<stdio.h>
void binary(int decimal)
{
int r,bin=0,p=1;
while(decimal!=0)
{
r=decimal%2;
bin=bin+p*r;
p=p*10;
decimal=decimal/2;
}
printf("%d",bin);
}
int main()
{
int a;
scanf("%d",&a);
binary(a);
return 0;
}
#include <stdio.h>
#include <stdlib.h>
int main()
{
int arr[8]={1,5,7,9,11,13,15,17};
int i,start=0,end=7,mid,key;
scanf("%d",&key);
do{
mid=(int)((start+end)/2);
if(arr[mid]==key){
printf("Find at the position of:%d\n",mid+1);
break;
}
else if(arr[mid]>key){
end=mid-1;
}
else{
start=mid+1;
}
}
while(start<=end);
if(start>end)
printf("%d is not found!!!\n",key);
return 0;
}
#include <stdio.h>
int main()
{
int array[100], search, c, n;
printf("Enter the number of elements in array:");
scanf("%d",&n);
printf("\nEnter %d integer(s):", n);
for (c = 0; c < n; c++)
scanf("%d", &array[c]);
printf("\nEnter the number to search\n");
scanf("%d", &search);
for (c = 0; c < n; c++)
{
if (array[c] == search) /* if required element found */
{
printf("%d is present at location %d.\n", search, c+1);
break;
}
}
if (c == n)
printf("%d is not present in array.\n", search);
return 0;
}
#include<stdio.h>
void perfect(int j);
int main(){
int n;
printf("Enter a number: ");
scanf("%d",&n);
perfect(n);
return 0;
}
void perfect(int j){
int i=1,sum=0;
while(i<j){
if(j%i==0)
sum=sum+i;
i++;
}
if(sum==j)
printf("%d is a perfect number",i);
else
printf("%d is not a perfect number",i);
}
#include<stdio.h>
int square(int);
int main(){
int a;
printf("Please enter a number:");
scanf("%d",&a);
printf("\nThe square of %d is:%d\n",a,square(a));
return 0;
}
int square(int x){
int y;
y=x*x;
return y;
}
#include <stdio.h>
#include <string.h>
int main()
{
char a[100],b[100];
while(1){
printf("Enter the string to check if it is a palindrome:");
scanf("%s",a);
strcpy(b,a);
strrev(b);
if (strcmp(a,b) == 0)
{
printf("Entered string is a palindrome.\n");
}
else
{
printf("Entered string is not a palindrome.\n");
break;
}
}
return 0;
}
#include<stdio.h>
int main()
{
int arr[2][2];
int i, j;
for(i=0; i<2; i++)
{
for(j=0;j<2;j++)
{
printf("\nEnter value for arr[%d][%d]:", i, j);
scanf("%d", &arr[i][j]);
}
}
printf("\nThe value of the selected array is :%d\n",arr[1][1]);
return 0;
}
#include<stdio.h>
///matrix summation
int main()
{
int a[10][10], b[10][10], sum[10][10], i, j, m,n,p,q;
printf("Enter the order of first matrix: ");
scanf("%d%d",&m,&n);
printf("Enter the order of second matrix: ");
scanf("%d%d",&p,&q);
if(m!=p && n!=q){
printf("Error match!!");
exit(0);
}
printf("Enter first matrix: \n");
for(i = 0 ; i < m; i++){
for(j = 0; j < n; j++)
scanf("%d", &a[i][j]);
}
printf("Enter second matrix: \n");
for(i = 0 ; i < p; i++){
for(j = 0; j < q; j++)
scanf("%d", &b[i][j]);
}
for(i = 0 ; i < m; i++){
for(j = 0; j < n; j++)
sum[i][j] = a[i][j] + b[i][j];
}
printf("The sum of the matrix is :\n");
for(i = 0 ; i < m; i++){
for(j = 0; j < n; j++){
printf("%d ", sum[i][j]);
}
printf("\n");
}
return 0;
}
