int strcmp(char *source, char *dest)函数

本文详细介绍了如何使用C语言实现字符串比较函数,并通过实例展示了其应用。

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#include <stdio.h>

int strcmp_test(char*source, char *dest) 
{    
while ( (*source != '\0') &&(*source == *dest))   
 {
	source++; 
	dest++;   
}   
 return ( (*source) - (*dest) ) ? -1 : 0; 
}

void main()
{
      char str1[]="abcd";
	  char str2[]="abcD";
	  int i=strcmp_test(str1,str2);
	  printf("%d \n",i);
}

帮我添加一个函数,用于对比与memcpy的时间效率: /* * @Description: Unit test for bulk memory copy. * @Author: liruibo.tp-link.com.hk * @Date: 2025-07-16 17:05:04 * @LastEditors: liruibo.tp-link.com.hk * @LastEditTime: 2025-07-31 15:57:35 */ #include "bulk_mem_copy.h" #include <assert.h> #include <stdlib.h> #include <string.h> void test_normal_copy() { const char src[] = "hello world"; char dest[50] = {0}; bulk_mem_copy((unsigned char*)dest, (unsigned char*)src, strlen(src) + 1); assert(0 == strcmp(dest, src)); printf("[PASS] normal copy test.\n"); } void test_zero_length_copy() { int dest = 42; int src = 0; bulk_mem_copy((unsigned char*)&dest, (unsigned char*)&src, 0); assert(42 == dest); printf("[PASS] zero length copy test.\n"); } void test_overlap_copy() { char data[15] = "AAAAABBBBBCCCCC"; bulk_mem_copy((unsigned char*)data + 5, (unsigned char*)data, 10); assert(0 == strcmp(data, "AAAAAAAAAABBBBB")); printf("[PASS] overlap copy test.\n"); } void test_large_block_copy() { const size_t size = 1024 * 1024 * 10; char* src = malloc(size); char* dest = malloc(size); if (NULL == src || NULL == dest) { printf("[ERROR] large block copy test malloc failed.\n"); exit(EXIT_FAILURE); } memset(src, 0xAA, size); bulk_mem_copy((unsigned char*)dest, (unsigned char*)src, size); assert(0 == memcmp(src, dest, size)); free(src); src = NULL; free(dest); dest = NULL; printf("[PASS] large block copy test.\n"); } int main() { printf("STARTING UNIT TESTS...\n"); test_normal_copy(); test_zero_length_copy(); test_overlap_copy(); test_large_block_copy(); printf("ALL TESTS PASSED!\n"); return 0; }
最新发布
08-01
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