#What is the usage of string comparison function strcmp in C?
Function prototype:
int strcmp(const char *s1, const char *s2);1
Header file:
#include
Function: Used to compare two strings
Parameters: s1 and s2 are two for comparison. String
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 value of s2 from the first character value of the s1 string. character, if the difference is zero, continue the comparison; if the difference is not zero, return the difference.
Until different characters appear or '\0' is encountered.
Special note: strcmp(const char *s1, const char * s2)Only strings can be compared here, numbers and other parameters cannot be compared.
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):-32Recommended tutorial: "C Language"
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