(C语言)用指向指针的指针的方法对5个字符串排序并输出

用指向指针的指针的方法对5个字符串排序并输出

#include<stdio.h>
#include<stdlib.h>
#define N 20
int Strcmp(char* p1, char* p2) {
	for (int i = 0; i < N; ++i) {
		if (p1[i] != p2[i]) {
			return p1[i] - p2[i];
		}
		else if (p1[i] == '\0' && p2[i] == '\0') {
			return 0;
		}
	}
	return 0;
}
void fun(char** str) {
	char* temp;
	for (int i = 0; i < 5; ++i) {
		for (int j = i + 1; j < 5; ++j) {
			if (Strcmp(*(str + i), *(str + j)) > 0) {
				temp = str[i];
				str[i] = str[j];
				str[j] = temp;
			}
		}
	}
}
void main() {
	char str1[N] = { '\0' };
	char str2[N] = { '\0' };
	char str3[N] = { '\0' };
	char str4[N] = { '\0' };
	char str5[N] = { '\0' };
	//定义指针数组str, 由5个指向char型数据的指针元素组成, 这5个指针元素分别是指向五个字符数组的指针
	char* str[5] = { str1,str2,str3,str4,str5};
	char** p = str;
	for (int i = 0; i < 5; ++i) {
		printf("请输入第%d个字符串\n", i + 1);
		fgets(*(p + i), N, stdin);
	}
	system("cls");
	//消除用fgets函数接受字符串后字符串末尾的换行符'\n'
	for (int i = 0; i < 5; ++i) {
		for (char* q = *(p + i); *q; ++q) {
			if (*q == '\n') {
				*q = '\0';
				break;
			}
		}
	}
	printf("排序前:\n");
	for (int i = 0; i < 5; ++i) {
		printf("%s\n\n", *(p + i));
	}
	fun(p);
	printf("排序后:\n");
	for (int i = 0; i < 5; ++i) {
		printf("%s\n\n", *(p + i));
	}
	system("pause");
}