Write a program in c language to compare two strings by using pointers.

#include <stdio.h>
#include <conio.h>

int compare_strings(char*, char*);

int main()
{
    char str1[100], str2[100], result;

    printf("Enter first string: ");
    gets(str1);

    printf("Enter second string: ");
    gets(str2);

    result = compare_strings(str1, str2);

    if ( result == 0 )
       printf("Strings are same.\n");
    else
       printf("Entered strings are not equal.\n");

    getch();
}

int compare_strings(char *str1, char *str2)
{
   while(*str1==*str2)
   {
      if ( *str1 == '\0' || *str2 == '\0' )
         break;

      str1++;
      str2++;
   }
   if( *str1 == '\0' && *str2 == '\0' )
      return 0;
   else
      return 1;
}

Write a program in c language to compare two strings without strcmp function or any other function

#include <stdio.h>
#include <string.h>
#include <conio.h>

int main()
{
   char str1[100], str2[100], ch;
   int i, check = 0, count = 0;

for(i=0; i<=100; i++)
{
str1[i] = str2[i] = 0;
}

   printf("Enter the first string: ");
   while(ch != 13)
   {
ch = getche();
str1[count] = ch;
count++;
   }
 
 
count = 0;
ch = NULL;
   printf("\nEnter the second string: ");
   while(ch != 13)
   {
ch = getche();
str2[count] = ch;
count++;
   }

for(i=0; i<=99; i++)
{
if(str1[i] != str2[i])
check = 1;
}


   if( check == 0 )
   {
      printf("\nEntered strings are equal.\n");
   }
   else
   {
      printf("\nEntered strings are not equal.\n");
   }
 
getch();
}

Write a program to Compare two strings by using strcmp function in c language

#include <stdio.h>
#include <string.h>
#include <conio.h>

int main()
{
   char str1[100], str2[100];

   printf("Enter the first string: ");
   gets(str1);

   printf("Enter the second string: ");
   gets(str2);

   if( strcmp(str1, str2) == 0 )
   {
      printf("Entered strings are equal.\n");
   }
   else
   {
      printf("Entered strings are not equal.\n");
   }
 
getch();
}

Write a program that will determine the prime factors of a specified factorial

#include <stdio.h>
#include <iostream>
using namespace std;

int main()
{

int number,div, num1;
int arr[20], i=0; 
int result=0, large_no;
cout<<"Enter a number to know its prime factor: "; 
cin>>number;
num1= number;
cout<<"\nThe prime factors of "<<number<<" are: \n\n";

div = 2;

while(number!=0)
{
if(number%div!=0)
div = div + 1;

else {
number = number / div;
cout<<div<<" ";
arr[i]= div;
i++;

if(number==1)
break;
}
}
large_no= arr[i-1];


cout<<endl;
cout<<"In this prime factorss.. "<<endl;
for(int j=2;j<=large_no;j++)
{
for(int k=0;k<=large_no;k++)
{

if(j==arr[k])
{
result=result+1;
}

} 
cout<<j<<" comes "<< result<<" time "<<endl;
result=0;
}


system("pause");
}