Oct 10, 2011

C Program to compare the two strings

C Strings:
C Program to accepts two strings and compare them, Finally it prints whether both are equal, or first string is greater than the second or the first string is less than the second string. The string comparison starts with the first character in each string and continues with subsequent characters until the corresponding characters differ or until the end of the strings is reached. Read more about C Programming Language .

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

void main()
{
 int count1=0,count2=0,flag=0,i;
 char str1[10],str2[10];

 clrscr();
 puts("Enter a string:");
 gets(str1);

 puts("Enter another string:");
 gets(str2);
 /*Count the number of characters in str1*/
 while (str1[count1]!='\0')
  count1++;
 /*Count the number of characters in str2*/
 while (str2[count2]!='\0')
  count2++;
 i=0;

 /*The string comparison starts with the first character in each string and
 continues with subsequent characters until the corresponding characters
 differ or until the end of the strings is reached.*/

 while ( (i < count1) && (i < count2))
 {
  if (str1[i] == str2[i])
  {
   i++;
   continue;
  }
  if (str1[i]<str2[i])
  {
   flag = -1;
   break;
  }
  if (str1[i] > str2[i])
  {
   flag = 1;
   break;
  }
 }

 if (flag==0)
  printf("Both strings are equal\n");
 if (flag==1)
  printf("String1 is greater than string2\n", str1, str2);
 if (flag == -1)
  printf("String1 is less than string2\n", str1, str2);
 getch();
}
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