What is the string comparison function in C language

#The string comparison function in C language is the strcmp() function.

Let’s introduce this function in detail.

Function prototype:

int strcmp(const char *s1, const char *s2);

Header file:

#include <string.h>

Function: Used to compare two strings.

Parameters: s1 and s2 are two strings to be compared.

Return value: If the strings s1 and s2 are equal, zero is returned; if s1 is greater than s2, a number greater than zero is returned; otherwise, a number less than zero is returned.

Explanation: The strcmp() function compares two strings based on the value of the ACSII code; the strcmp() function first subtracts the first character of s2 from the first character value of the s1 string. If If the difference is zero, the comparison continues; if the difference is not zero, the difference is returned. Until a different character appears or '\0' is encountered.

Note: strcmp(const char * s1, const char * s2) can only compare strings, not numbers and other parameters.

Code example:

#include <string.h>
int main(void){
    char *p="aBc";
    char *q="Abc";
    char *h="abc";	
    printf("strcmp(p,q):%d\n",strcmp(p,q));
    printf("strcmp(p,h):%d\n",strcmp(p,h));	
    return 0;	
} 
//结果：
//strcmp(p,q):32
//strcmp(p,h):-32

Recommended tutorial: C language tutorial

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