C Language | Arrays 19

Question:13
C program to take input for a string and print reverse of the string?
example:
n=”hello”
reverse:
olleh
Sol:

#include<stdio.h>
int main()
{
  char n[20];
  int i=0;
  /* clrscr(); */
  printf("Enter any string ");
  gets(n);
  //to find length
  for(i=0;n[i]!='\0';i++);
  //
  /*
  i=0;
  while(n[i]!='\0')
  {
   i++;
  }

  */
  printf("len = %d\n",i);
  i--;
  printf("Reverse string is ");
  while(i>=0)
  {
    printf("%c",n[i]);
    i--;
  }
  getch();
  return(0);
}

/* Output */

Enter any string hello
len = 5
Reverse string is olleh

Question:14
C program to take input for two string and concatenate them into a third string.
n1=”hello”
n2=”world”
concatenated string:
n3=”hello world”
Sol:

#include<stdio.h>
int main()
{
  char n1[20],n2[20],n3[40];
  int i=0,j=0;
  /* clrscr(); */
  printf("Enter 1st string ");
  gets(n1);
  printf("Enter 2nd string ");
  gets(n2);
  while(n1[i]!='\0')  //for(;n1[i]!='\0';)
  {
    n3[i]=n1[i];
    i++;
  }
  //if we want to give space
  n3[i]=' ';
  i++;
  while(n2[j]!='\0')
  {
    n3[i]=n2[j];
    i++;
    j++;
  }
  n3[i]='\0';
  printf("copied string is %s\n",n3);
  getch();
  return(0);
}

/* Output */

Enter 1st string hello
Enter 2nd string world
copied string is hello world

Question:15
C program to take input for a string check and print whether the string is palindrome or not.
n=”hello”
reverse : olleh
string is not palindrome
n=”madam”
reverse : madam
string is palindrome
Sol:

#include<stdio.h>
int main()
{
  char n[20];
  int i=0,j,len,z=0;
  /* clrscr(); */
  printf("Enter any string ");
  gets(n);
  //to find length
  for(i=0;n[i]!='\0';i++);
  len=i;
  //printf("len = %d\n",len);
  i=0;
  j=len-1;
  while(i<=len/2)
  {
    //printf("%c %c\n",n[i],n[j]);
    if(n[i]!=n[j])
    {
      z=1;
      break;
    }
    i++;
    j--;

  }
  if(z==0)
  printf("string is palindrome");
  else
  printf("string is not palindrome");

  getch();
  return(0);
}

/* Output */

case:1

Enter any string hello
string is not palindrome

case:2

Enter any string madam
string is palindrome