FILE *fp;

char c1[512];

char c2[512];

int i=0;

if((fp=fopen("/路徑"，"r"))=NULL)

printf("cant open the file");

//讀出檔案內容並顯示

while(!feof(fp))

{

c1[i++]=fgetc(fp);

}

printf("%s\n",c1);

fclose(fp);

//向檔案內寫內容

if((fp=fopen("/路徑"，"w"))=NULL)

printf("cant open the file");

printf("please input c2:\n");

scanf("%s",c2);

fprintf(fp,"%s",c2);

fclose(fp);