Sample Questions

1. Write a program, using pointers, which accepts a string and displays the length of the string.
2. Write a program that accepts (wo strings, compares them, and displays which is bigger.
3. Write a program that copies a string into another.

Write a program that. given two strings, append the second string to the first

 Sample Questions and answers

1. The following program accepts a string as input and displays its length
   

   #include <stdio.h>
   main()
   {
   int n=0;
   char *ptr=”pointer”;
   puts(“Enter the string”);
   gets(ptr);
   fflush(stdin);
   for(;*ptr!=’’;ptr++)
   	n++;
   printf(“
   The length of the string is %d”, n);
   }​

   Run
2. Program that accepts two strings and compares them.
   

   #include <stdio.h>
   main(){
   char *str1="string one";
   char *str2 ="string two";
   puts ("
   Enter first string"):
   gets (str1) ;
   fflush(stdin) ;
   puts ("
   Enter second string");
   gets (str2) ;
   fflush (stdin);
               for(;*str1==*str2 && (*str1! ='’ || *str2!=’); str1++, str2++) ;
   if(*str1==’ ’ && *str2==''){
   printf(“
   The strings are equal”);
   return;
   }
   if (*str1> *str2)
   printf(“
   The first string is bigger than the second”);
                  else
   printf(“
   The second string is bigger than the first”);
   
   return;
   }​

   Run
3. The following program copies a string into another
   

   #include <stdio.h>
   main(){
   char *string1= "string one";
   char *string2 ="string two";
   puts ( "
   Enter the string");
   gets (string2);
   fflush (stdin) ;
   while (*string2!=’'){
   *string1=*string2 ;
   String1++;
                  }
   *string1= '’ ;
   printf("
   The copy is over”);
   return;
   }​

   Run
4. As an extension of the previous program that copies the second string into the first, the following program concatenates the two strings
   

   #include <stdio.h>
   main(){
   char *string1="string one”;
   char *string2 ="string two";
   puts ("
   Enter first string");
   gets (string1) ;
   fflush(stdin);
   puts ("
   Enter second string”);
   gets (string2);
               fflush(stdin);
   for(;*string1 != ‘’;string1++);  /* traverse to the end of string1 */
   while (*string2! = ‘’){
   *string1=*string2;
   string1++;
   string2++;
   }
   *string1 = ‘’;
   return;
       }​

   Run