指针数组作为main函数的形参

#include <stdio.h> 

int main(int argc, char *argv[]) { 
printf("程序名称：%s\n", argv[0]); 
printf("参数个数：%d\n", argc - 1); // 减去程序名称 

for (int i = 1; i < argc; i++) { 
printf("参数 %d: %s\n", i, argv[i]); 
} 

return 0; 
}

#include <stdio.h> 
#include <stdlib.h> 

void copyFile(const char *src, const char *dst, size_t bufferSize) { 
FILE *sourceFile = fopen(src, "rb"); 
FILE *destinationFile = fopen(dst, "wb"); 

if (!sourceFile || !destinationFile) { 
perror("无法打开文件"); 
exit(EXIT_FAILURE); 
} 

char *buffer = (char *)malloc(bufferSize); 
if (!buffer) { 
perror("内存分配失败"); 
exit(EXIT_FAILURE); 
} 

size_t bytesRead; 
while ((bytesRead = fread(buffer, 1, bufferSize, sourceFile)) > 0) { 
fwrite(buffer, 1, bytesRead, destinationFile); 
} 

free(buffer); 
fclose(sourceFile); 
fclose(destinationFile); 
} 

int main(int argc, char *argv[]) { 
if (argc != 3 && argc != 4) { 
printf("用法：%s <源文件> <目标文件> [缓冲区大小]\n", argv[0]); 
return 1; 
} 

const char *sourceFile = argv[1]; 
const char *destinationFile = argv[2]; 
size_t bufferSize = 1024; // 默认缓冲区大小 

if (argc == 4) { 
bufferSize = atol(argv[3]); // 将第三个参数转换为长整型 
} 

copyFile(sourceFile, destinationFile, bufferSize); 
return 0; 
}