Comparing two strings in C

Question

This code is not working as the comparison is not being done  Why   All names get past the if   printf  Enter Product   n    scanf   s    amp nameIt2   printf  Enter Description   n    scanf   s    amp descriptionI   printf  Enter Quantity   n    scanf   d    amp qtyI   printf  Enter Order Quantity   n    scanf   s    amp ordqtyI    while  fscanf fp4    s  s  d  s n    amp namet2   amp description2   amp qty2   amp ordqty2     EOF       if namet2    nameIt2          fprintf fpt2    s  s  d  s n    amp namet2   amp description2  qty2   amp ordqty2

User · Answer

if strcmp sr1 str2      this returns 0 if strings r equal      flag 0  else flag 1     then last check the variable flag value and print the message                            OR  char str1 20  str2 20   printf  enter first str  gt      gets str1   printf  enter second str  gt      gets str2    for int i 0 str1 i     0  i          if str i   str2 i            flag 0      else  flag 1  break         check the value of flag if it is 0 then strings r equal simple

User · Answer

You try and compare pointers here  not the contents of what is pointed to  ie  your characters    You must use either memcmp or str  n cmp to compare the contents

User · Answer

To compare two C strings  char     use strcmp    The function returns 0 when the strings are equal  so you would need to use this in your code   if  strcmp namet2  nameIt2     0    If you  wrongly  use  if  namet2    nameIt2    you are comparing the pointers  addresses  of both strings  which are unequal when you have two different pointers  which is always the case in your situation

User · Answer

To answer the WHY in your question   Because the equality operator can only be applied to simple variable types  such as floats  ints  or chars  and not to more sophisticated types  such as structures or arrays  To determine if two strings are equal  you must explicitly compare the two character strings character by character

User · Answer

You need to use strcmp   strcmp namet2  nameIt2

User · Answer

The name of the array indicates the starting address  Starting address of both namet2 and nameIt2 are different  So the equal to      operator checks whether the addresses are the same or not  For comparing two strings   a better way is to use strcmp    or we can compare character by character using a loop

User · Answer

You are currently comparing the addresses of the two strings   Use strcmp to compare the values of two char arrays   if  strcmp namet2  nameIt2     0

User · Answer

For comparing 2 strings  either use the built in function strcmp   using header file string h   if strcmp a b   0      printf  Entered strings are equal    else     printf  Entered strings are not equal      OR you can write your own function like this   int string compare char str1    char str2          int ctr 0       while str1 ctr   str2 ctr                 if str1 ctr     0   str2 ctr     0               break          ctr              if str1 ctr     0   amp  amp  str2 ctr     0           return 0      else         return -1

[c] Comparing two strings in C?

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