int main () { FILE *fp; char str[60]; /* opening file for reading */ fp = fopen("wenxue.log" , "r"); if(fp == NULL) { perror("Error opening file"); return(-1); } if( fgets (str, 60, fp)!=NULL ) { /* writing content to stdout */ puts(str); } fclose(fp); re...
写入字符串 int fputs( const char *string, FILE *stream ); string:要写入的字符串 stream:一次读取的大小 例: 代码语言:javascript 复制 char buf[10] = { 0 }; FILE *pf = fopen("file.txt", "r"); if (pf == NULL) { perror("open file for reading"); exit(0); } fgets(buf, 9, ...
FILE *outfile; double cache[32]; struct rawdata data_arr[BLOCKMAX]; int *ptr_data_arr; // open file to write outfile = fopen ("rawdata.dat", "w"); if (outfile == NULL) { fprintf(stderr, "\nError opening file! \n"); exit (1); } for (int i=0; i< 32; i++) { cac...
Now let's suppose the second binary fileoldprogram.binexists in the locationE:\cprogram. The second function opens the existing file for reading in binary mode'rb'. The reading mode only allows you to read the file, you cannot write into the file. ...
(C/C++) FILE 讀寫檔案操作 在C/C++ 讀寫檔案操作比較常見應該是利用FILE、ifstream、ofstream 在這篇筆記裡頭記錄 FILE、fstream 使用方法及操作 1#include <iostream>2#include <stdio.h>3#include <stdlib.h>4#include <fstream>56usingnamespacestd;789intmain()10{11/*12r : open for reading13rb : ...
bin: unexpected end of file\n"); else if (ferror(fp)) { perror("Error reading test...
if (ferror(fp)) puts("I/O error when reading"); else if (feof(fp))//假如读到文件尾,返回非0,执行以下命令 puts("End of file reached successfully"); fclose(fp); } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13.
// Open a file in read mode fptr = fopen("filename.txt","r"); This will make thefilename.txtopened for reading. It requires a little bit of work to read a file in C. Hang in there! We will guide you step-by-step. Next, we need to create a string that should be big enoug...
1, 5, fp) != 5) { perror("Error reading from file");fclose(file);return 1;} // 在读取的字符串末尾添加字符串结束符 buf[5] = '\0';// 输出读取的字符串 printf("Read string: %s\n", buf);// 关闭文件 fclose(fp);return 0;} “r+”：read & update mode ,读取和更新模式 ...
FILE* pr = fopen("data.txt", "r"); if (pr == NULL) { printf("open for reading: %s\n", strerror(errno)); return 0; } FILE* pw = fopen("data2.txt", "w"); if (pw == NULL) { printf("open for writting: %s\n", strerror(errno)); ...