strcmp

原型：extern int strcmp(char *s1,char * s2);         

用法：#include <string.h>   

功能：比较字符串s1和s2。   

说明：       

 当s1<s2时，返回值<0       

当s1=s2时，返回值=0       

当s1>s2时，返回值>0   

举例：     

// strcmp.c           

#include <syslib.h>     

 #include <string.h>     

 main()     

 {      

  char *s1="Hello, Programmers!";       

char *s2="Hello, programmers!";       

int r;               

clrscr();              

 r=strcmp(s1,s2);       

 if(!r)         

printf("s1 and s2 are identical");       

else       

 if(r<0)         

 printf("s1 less than s2");       

 else         

printf("s1 greater than s2");               

getchar();       

return 0;     

}