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strcmp

คำอธิบาย​

Compares two strings to see if they are the same.

NameDescription
string1The first string to compare.
string2The second string to compare.
ignorecase (optional)When set to true, the case doesn't matter - HeLLo is the same as Hello. When false, they're not the same.
length (optional)When this length is set, the first x chars will be compared - doing "Hello" and "Hell No" with a length of 4 will say it's the same string.

ส่งคืน​

0 if strings match each other on given length;1 o r -1 if some character do not match: string1[i] - string2[i] ('i' represents character index starting from 0);difference in number of characters if one string matches only part of another string.

ตัวอย่าง​

new string1[] = "Hello World";
new string2[] = "Hello World";

// Check if the strings are the same
if (!strcmp(string1, string2))

new string3[] = "Hell";

// Check if the first 4 characters match
if (!strcmp(string2, string3, false, 4))

// Check for null strings with isnull()
if (!strcmp(string1, string2) && !isnull(string1) && !isnull(string2))

// Definition for isnull():
#if !defined isnull
    #define isnull(%1) ((!(%1[0])) || (((%1[0]) == '\1') && (!(%1[1]))))
#endif

บันทึก​

warning

If you compare strings from a text file, you should take in to account the 'carriage return' and 'new line' special characters (\r \n), as they are included, when using fread.

ฟังก์ชั่นที่เกี่ยวข้องกัน​

  • strfind: Search for a string in another string.
  • strtok: Get the next 'token' (word/parameter) in a string.
  • strdel: Delete part of a string.
  • strins: Insert text into a string.
  • strlen: Get the length of a string.
  • strmid: Extract part of a string into another string.
  • strpack: Pack a string into a destination string.
  • strval: Convert a string into an integer.
  • strcat: Concatenate two strings into a destination reference.