strcmp function compares two strings and returns an integer value: 0 (equal), positive number (the first string is greater than the second string), negative number (the first string is less than the second string) string).
The role of strcmp in C language
The strcmp function is a function in the C standard library, used for comparison Two C strings. It receives two strings as parameters and returns an integer value representing the comparison result.
Explanation of return value:
- 0: If the two strings are the same.
- Positive number: If the first string is alphabetically larger than the second string (that is, the ASCII code value of the first string is greater).
- Negative number: If the first string is lexically smaller than the second string (that is, the ASCII code value of the first string is smaller).
Working principle:
The strcmp function compares characters in two strings one by one. If a non-matching character is encountered, the difference in ASCII codes of the first non-matching character is returned. If the two strings are the same, the function compares all characters and returns 0.
Syntax:
int strcmp(const char *str1, const char *str2);
Parameters:
-
str1
: The number to be compared a string. -
str2
: The second string to compare.
Example:
#include <stdio.h> #include <string.h> int main() { char str1[] = "Hello"; char str2[] = "World"; int result = strcmp(str1, str2); if (result == 0) { printf("字符串相同。\n"); } else if (result > 0) { printf("第一个字符串大于第二个字符串。\n"); } else { printf("第一个字符串小于第二个字符串。\n"); } return 0; }
Output:
<code>第一个字符串小于第二个字符串。</code>
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