【C语言

#include<stdio.h> #include <stdlib.h> #include <assert.h> #include <string.h> int Strcmp(const char* str1, const char* str2) { assert(str1 != NULL); assert(str2 != NULL); int i = 0; int len = 0; int len1 = strlen(str1); int len2 = strlen(str2); if (len1 >= len2) { len = len1; } else { len = len2; } for (int i = 0; i<len; ++i) { if (str1[i]<str2[i])//a 97 b 98 { return 1;// 数值上a比b小,但是字典序 a 比 b 大 返回值大于0 } else if (str1[i]>str2[i])// b 98 a 97 { return -1; //数值上b比a大, 但是字典序 b 比 a 小 返回值小于0 } else if (str1[i] == str2[i] && str1[i] != '\0') { continue; } else if (str1[i] == '\0'&&str2[i] == '\0') { return 0; } else break; } return 0; } int main() { char a[] = "bbbbabbb"; char b[] = "bbbbbbbb"; int ret = Strcmp(a, b); if (ret > 0) { printf("a>b\n"); } else if (ret < 0) { printf("a<b\n"); } else printf("a=b\n"); system("pause"); return 0; }